Digital Measurement iOS Simplified API

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Overview

The App SDK is the framework for mobile application developers to integrate Nielsen Measurement into their media player applications. It supports a variety of Nielsen Measurement Products like Digital in TV Ratings, Digital Content Ratings (DCR & DTVR), and Digital Ad Ratings (DAR). Nielsen SDKs are also equipped to measure static content and can track key life cycle events of an application like:

• Application launch events and how long app was running
• Time of viewing a sub section / page in the application.

Prerequisites

To start using the App SDK, the following details are required:

• App ID (appid): Unique ID assigned to the player/site and configured by product.
• sfcode: Unique identifier for the environment that the SDK should point to.
• Nielsen SDK: The Nielsen SDK package contains a variety of sample players for your reference.

If you do not have any of these prerequisites or if you have any questions, please contact our SDK sales support team. Refer to Digital Measurement Onboarding guide for information on how to get a Nielsen App SDK and appid.

Simplified API

As part of making the SDK more user-friendly and reducing the number of app integration touch points, Nielsen has designed a simple interface to pass metadata to the SDK. The new trackevent() API has been implemented as a wrapper for the existing SDK and will be responsible for handling new API calls, performing validation, and translating new API calls to the existing Nielsen App SDK API methods. Applications which are already integrated with the existing SDK API are unaffected by this new API. In the Simplified API, one API call will be used to reference many methods. The key-value structure of this API call will provide information for proper crediting. The SDK will utilize the data received in this call and translate it into a sequence of calls linking to the existing API.

For iOS SDK framework package will contain 2 public header files. One header file will contain old SDK interface and will be used by existing clients (NielsenAppApi.h). New API will be defined in a new public header file (NielsenEventTracker.h).

For Android, a new wrapper class for AppSdk will be introduced (AppSdkTrackEvent). This class will be responsible for handling and translating new API calls into calls of the existing Nielsen App SDK API methods. A new public API will be introduced in this class, that accepts a JSONObject parameter.

Implementation

This guide covers implementation steps for iOS using Xcode.

Setting up your Development Environment

Prior to SDK Version 6.2.0.0 the IOS framework has been distributed as a static library packaged into framework bundle format. Apple recommends to use dynamic framework, it has some benefits over static libraries like less executable file size of an app, faster startup time and native support in xCode IDE. Nielsen AppSDK has been transformed into dynamic framework in this release (static framework is still available).

If migrating from the static library to this new dynamic framework, once implemented, unless your specific application requires, you can remove the following Frameworks that were once required: [AdSupport, JavascriptCore, SystemConfiguration, Security, AVFoundation, libc++]

The Dynamic framework is created as a fat framework. It means that it contains slices required for devices (armv7, arm64) as well as slices required for simulators (i386, x86_64). Simulator slices are needed to let clients build and debug their app on the simulators, but they should be removed before sending the app to the AppStore. The example of the shell script that should be added as a Run Script phase in the application can be found below.

How to obtain the NielsenAppApi.Framework

The Nielsen AppSDK can either be downloaded, or integrated directly within an application through the use of a CocoaPod.

• Select to Download Directly
• Select to obtain Cocoapod implementation guide

Configuring Xcode Development Environment

Starting with SDK version 6.0.0.0, the Nielsen App SDK is compatible with Apple iOS versions 8.0 and above. In addition, the framework supports modules, so all the required frameworks are linked automatically as the are needed. More details can be found here: https://stackoverflow.com/questions/24902787/dont-we-need-to-link-framework-to-xcode-project-anymore

Note: All communications between the SDK and the Census (Collection Facility) use HTTPS.

Download Framework

The first step is to download and copy the NielsenAppApi.framework bundle to the app project directory.

Add Framework

In the General tab for app configuration add NielsenAppApi.framework in the list of Embedded Binaries.

Add Path

Add path to the NielsenAppApi.framework in the Framework Search Paths build setting.

Import Framework

Add NielsenAppApi.framework module in the source file of your app:

Using Swift

You can use Objective-C and Swift files together in a single project, no matter which language the project used originally. This makes creating mixed-language app and framework targets as straightforward as creating an app or framework target written in a single language.

For more detailed information regarding importing Objective-C into Swift

Using Objective-C

Add the code to the View Controller’s header file.

#import <NielsenAppApi/NielsenEventTracker.h>

SDK Initialization

The latest version of the Nielsen App SDK allows instantiating multiple instances of the SDK object, which can be used simultaneously without any issue. The sharedInstance API that creates a singleton object was deprecated prior to version 5.1.1.

• Starting at version 6.0.0 of the SDK, there is no limit on the number of instances.

The following table contains the list of arguments that should be passed during initialization.

• The appid is provided by the Nielsen Technical Account Manager (TAM).

Parameter / Argument	Description	Source	Required?	Example
appid	Unique id for the application assigned by Nielsen. It is GUID data type, provided by the Nielsen Technical Account Manager (TAM).	Nielsen-specified	Yes	PXXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
appname	Name of the application	Client-defined	No	"Nielsen Sample App"
appversion	Current version of the app used	Client-defined	No	"1.0.2"
sfcode	Specifies the Nielsen collection facility to which the SDK should connect DTVR "us" Digital Audio "drm" DCR "dcr"	Nielsen-specified	Yes	"dcr"
nol_devDebug	Enables Nielsen console logging and is only required for testing	Nielsen-specified	Optional	"DEBUG" "INFO" "WARN"

Debug flag for development environment

Player application developers / integrators can use Debug flag to check whether an App SDK API call made is successful. To activate the Debug flag, Pass the argument "nol_devDebug": "INFO" , in the JSON string . The permitted values are:

• INFO: Displays the API calls and the input data from the application (validate player name, app ID, etc.). It can be used as certification Aid.
• WARN: Indicates potential integration / configuration errors or SDK issues.
• ERROR: Indicates important integration errors or non-recoverable SDK issues.
• DEBUG: Debug logs, used by the developers to debug more complex issues.

Once the flag is active, it logs each API call made and the data passed. The log created by this flag is minimal.

Note: DO NOT activate the Debug flag in a production environment.

Sample SDK Initialization Code

Swift

Swift Example:

NielsenInit.swift

import Foundation
import NielsenAppApi

class NielsenInit : NSObject {
    class func createEventTracker(delegate: NielsenEventTrackerDelegate) -> NielsenEventTracker?{
    
        //Initialising the NielsenEventTracker class by passing app information which returns the instance of NielsenEventTracker.
        
        var nielsenEventTracker: NielsenEventTracker?
        
        let appInformation = [
  
            "appid": "PDA7D5EE6-B1B8-4123-9277-2A788XXXXXXX",
            "appversion": "1.0",
            "appname": "Amazing app",
            "sfcode": "dcr",
            "nol_devDebug": "DEBUG"
        ]
        
        nielsenEventTracker = NielsenEventTracker(appInfo:appInformation1, delegate:delegate)
        return nielsenEventTracker
    }
}

Sample code: ViewController
ViewController.swift

    override func viewDidLoad() {
        super.viewDidLoad()
        
        //Getting the instance of NielsenEventTracker
        
        self.nielsenEventTracker = NielsenInit.createEventTracker(delegate: self)

Objective C

Initialize the Nielsen App object within the viewDidLoad view controller delegate method using initWithAppInfo:delegate:

If App SDK is initialized using init or new methods, it will ignore the API calls resulting in no measurement. The SDK will not return any errors.

Objective-C Example: NielsenInit.m

    
#import "NielsenInit.h"
#import <NielsenAppApi/NielsenEventTracker.h>

@implementation NielsenInit

+ (NielsenEventTracker *)createNielsenEventTrackerWithDelegate:(id<NielsenEventTrackerDelegate>)delegate
{
    //Initialising the NielsenEventTracker class by passing app information which returns the instance of NielsenEventTracker.
    
    NSDictionary *appInformation = @{ @"appid": @"PDA7D5EE6-B1B8-4123-9277-2A788XXXXXXX",
                            @"appversion": @"1.0",
                            @"appname": @"Amazing app",
                            @"sfcode": @"dcr",
                            @"nol_devDebug": @"DEBUG"};
                         
    return [[NielsenEventTracker alloc] initWithAppInfo:appInformation delegate:delegate];
}

The ViewController.m file could then contain the following line(s):

  
    //Getting the instance of NielsenEventTracker
    nielsenEventTracker = [NielsenInit createNielsenEventTrackerWithDelegate:nil];
/////

}

APP SDK Error & Event Codes

To view the Error and Event codes for iOS and Android, please review the App SDK Event Code Reference page.

Simplified API Syntax

The existing API has a number of methods used for reporting player and application state changes to the SDK. The order of calls is important for the SDK in the existing API. In the new simplified API, all these calls will be replaced with one API call that will get one dictionary object with many key-value pairs, where any value could be another complex dictionary object. All the data provided in the older API in separate calls will be provided in one single call.

Main API call for the new NielsenEventTracker API:

 
- (void)trackEvent:(NSDictionary *)data;

Handling JSON Metadata

Parameter “data” is a JSON object with many key-value pairs that holds all information required by SDK.

Format of input object is the following:

{ 
 "event": <event identifier>,
 "type": <type of metadata>,
 "metadata":{ 
   "content": <content metadata object>,
   "ad": <ad metadata object>,
   "static": <static metadata object>
 },
 "playheadPosition":<playhead value | Unix Timestamp>,
 "id3Data": <id3 payload>,
 "ottData": <ott info object>,
 "optout": <optout string>
}

Event Types

The New API method supports the following event types:

Key	Description
playhead	It is used to pass content, ad or static metadata, the current playhead value, Unix timestamp or id3 payload, OTT information to the SDK.
pause	This event should be used to in the following cases: application enters background, any application interruptions, content playback is paused. (Pause is detected by SDK automatically only if the time gap between commands exceeds 30 minutes.)
complete	This event should be called when the session is completed, ends, or the user initiates a stop.
adStop	This event should be called at the end of each ad and is required when advertisements have the same assetId.

DCR and DTVR require various levels of data. Please select the tab for the product you are interested in reviewing.

DCR

Digital Content Ratings

Parameter	Description	Supported values	Example
event	Event identifier	String: playhead, pause, complete, adStop	"event":"playhead"
type	Determines the metadata object that should be used for crediting.	String: content, ad, static	"type":"content"
metadata	Object that holds metadata values of specific types Detailed in tables below	Object	"metadata":{ "content": <content metadata object>, "ad": <ad metadata object>, "static": <static metadata object> },
playheadPosition	Playhead value as reported by video player. Unix timestamp (seconds since Jan-01-1970 UTC) for live video.	String	Position value is Unix timestamp (live): "playheadPosition":"1542797780" Position value is playhead: "playheadPosition":"10"

Content Metadata

Content metadata sent for every playheadPosition update.

Key	Description	Example	Required
assetName	name of program (100 character limit)	"MyTest789"	Yes
assetid	unique ID assigned to asset	"B66473"	Yes
length	length of content in seconds	"3600" (0 for live stream or unknown)	Yes
program	name of program (100 character limit)	"MyProgram"	Yes
segB	custom segment B ¹	"CustomSegmentValueB"	No
segC	custom segment C ¹	"segmentC"	No
title	name of program (100 character limit)	"S2,E3"	Yes
type	'content', 'ad', 'static'	'content'	Yes
section	Unique Value assigned to page/site section	"HomePage"	Yes
airdate	the airdate in the linear TV ²	"20180120 10:00:00"	Yes
isfullepisode	full episode flag	"y"- full episode, "n"- not a full episode	Yes
crossId1	standard episode ID	"Standard Episode ID"	Yes
crossId2	content originator (only required for distributors)	Provided by Nielsen	Yes (if distributor)
adloadtype	linear ("1") vs dynamic ("2") ad model	"1"	Yes

¹ Custom segments (segB and segC) can be used to aggregate video and/or static content within a single brand to receive more granular reports.
² Acceptable Air Date Formats:

YYYYMMDD HH24:MI:SS
YYYYMMDDHH24MISS
YYYY-MM-DDTHH:MI:SS
YYYY-MM-DDHH:MI:SS 
YYYYMMDDHH:MI:SS
MM-DD-YYYY
YYYYMMDD HH:MI:SS

For USA all times should be EST, for all other countries Local Time. Below is a sample event for DCR. If there are no ad or static values, the values for these keys can be left as blank/null.

{ 
"event": "playhead",
"type": "content",
"metadata": { 
  "content":{
    "assetName":"Big Buck Bunny",
    "assetid":"B66473",
    "length":"3600",
    "program":"MyProgram",
    "segB":"CustomSegmentValueB",
    "segC":"segmentC",
    "title":"S2,E3",
    "type":"content",
    "section":"cloudApi_app",
    "airdate":"20180120 10:00:00",
    "isfullepisode":"y",
    "crossId1":"Standard Episode ID",
    "crossId2" :"Content Originator",
    "adloadtype":"2"},
"ad": {},
"static": {}
},
"playheadPosition": "",
}

DTVR

Digital TV Ratings info

Parameter	Description	Supported values	Example
event	Event identifier	String: playhead,pause,complete, adStop	"event":"playhead"
type	Determines the metadata object that should be used for crediting.	String: content, ad, static	"type":"content"
metadata	Object that holds metadata values of specific types. Detailed in tables below	Object	"metadata":{ "content": <content metadata object>, "ad": <ad metadata object>, "static": <static metadata object> },
playheadPosition	Playhead value or Unix timestamp	String	Position value is Unix timestamp: "playheadPosition":"1501225191747" Position value is playhead: "playheadPosition":"10"
id3Data	Nielsen ID3 payload	String	"id3Data": "www.nielsen.com/065H2g6E7ZyQ5UdmMAbbpg ==/_EMc37zfVgq_8KB7baUYfg==/ADQCAmgV1Xyvnynyg60 kZO_Ejkcn2KLSrTzyJpZZ-QeRn8GpMGTWI7-HrEKzghxyzC yBEoIDv2kA2g1QJmeYOl5GnwfrLDVK2bNLTbQxr1z9VBfxa hBcQP5tqbjhyMzdVqrMKuvvJO1jhtSXa9AroChb11ZUnG1W VJx2O4M=/33648/22847/00"

Content Metadata

Content metadata sent for every playheadPosition update.

Key	Description	Example	Required
channelName	name of program (32 character limit)	"MyTest789"	Yes
type	'content', 'ad', 'static'	"content"	Yes
adModel	linear ("1") vs dynamic ("2") ad model	"1"	Yes

Below is a sample event for DTVR. If there are no ad or static values, the values for these keys can be left as blank/null.

{ 
"event": "playhead",
"type": "content",
"metadata": { 
  "content":{
    "adModel":"1",
    "channelname":"channel1"
  },
"ad": {},
"static": {}
},
"playheadPosition": "",
"id3Data": "www.nielsen.com/065H2g6E7ZyQ5UdmMAbbpg==/_
EMc37zfVgq_8KB7baUYfg==/ADQCAmgV1Xyvnynyg60kZO_Ejkcn
2KLSrTzyJpZZ-QeRn8GpMGTWI7-HrEKzghxyzCyBEoIDv2kA2g1Q
JmeYOl5GnwfrLDVK2bNLTbQxr1z9VBfxahBcQP5tqbjhyMzdVqrMK
uvvJO1jhtSXa9AroChb11ZUnG1WVJx2O4M=/33648/22847/00"
}

DCR & DTVR

Applies to DCR and DTVR

Parameter	Description	Supported values	Example
event	Event identifier	String: playhead, pause, complete, adStop	"event":"playhead"
type	Determines the metadata object that should be used for crediting.	String: content, ad, static	"type":"content"
metadata	Object that holds metadata values of specific types Detailed in tables below	Object	"metadata":{ "content": <content metadata object>, "ad": <ad metadata object>, "static": <static metadata object> },
playheadPosition	Playhead value or Unix timestamp (seconds since Jan-01-1970 UTC)	String	Position value is Unix timestamp: "playheadPosition":"1501225191747" Position value is playhead: "playheadPosition":"10"
id3Data	Nielsen ID3 payload	Object	"id3Data": "www.nielsen.com/065H2g6E7ZyQ5UdmMAbbpg ==/_EMc37zfVgq_8KB7baUYfg==/ADQCAmgV1Xyvnynyg60 kZO_Ejkcn2KLSrTzyJpZZ-QeRn8GpMGTWI7-HrEKzghxyzC yBEoIDv2kA2g1QJmeYOl5GnwfrLDVK2bNLTbQxr1z9VBfxa hBcQP5tqbjhyMzdVqrMKuvvJO1jhtSXa9AroChb11ZUnG1W VJx2O4M=/33648/22847/00"
ottData	Object that holds OTT information	Object	"ottData": { "ottStatus": 1, "ottType": casting, "ottDevice": chromecast, "ottDeviceID": 1234 }

Content Metadata

Content metadata sent for every playheadposition update.

Keys	Description	Example	Required
length	length of content in seconds	seconds (0 for live stream)	Yes
type	"content", "ad", "static"	"content"	Yes
adModel	linear vs dynamic ad model	1=Linear 2=Dynamic Ads	custom
adloadtype	DCR Ad Model	1=Linear 2=Dynamic Ads	custom

+ Custom segments (segB and segC) can be used to aggregate video and/or static content within a single Brand to receive more granular reports within a brand.
++ Acceptable Air Date Formats:

YYYYMMDD HH24:MI:SS
YYYYMMDDHH24MISS
YYYY-MM-DDTHH:MI:SS
YYYY-MM-DDHH:MI:SS 
YYYYMMDDHH:MI:SS
MM-DD-YYYY
YYYYMMDD HH:MI:SS

Below is a sample event for DCR/DTVR joint integration. If no ad or static values, these can be left as blank/null.

{ 
"event": "playhead",
"type": "content",
"metadata": { 
  "content":{
    "type":"content",
    "length":"0",
    "adModel":"1",
    "adloadtype":"1"},
  "ad": {},
  "static": {}
},
"playheadPosition": "",
"id3Data": "www.nielsen.com/065H2g6E7ZyQ5UdmMAbbpg==/_
EMc37zfVgq_8KB7baUYfg==/ADQCAmgV1Xyvnynyg60kZO_Ejkcn
2KLSrTzyJpZZ-QeRn8GpMGTWI7-HrEKzghxyzCyBEoIDv2kA2g1Q
JmeYOl5GnwfrLDVK2bNLTbQxr1z9VBfxahBcQP5tqbjhyMzdVqrMK
uvvJO1jhtSXa9AroChb11ZUnG1WVJx2O4M=/33648/22847/00"
}

Ad Metadata

The ad metadata (if applicable) should be passed for each individual ad, if ads are available during or before the stream begins.

Key	Description	Example	Required
assetid	unique ID assigned to ad (no Special Characters)	"AD12345"	Yes
title	unique name assigned to ad	"ADtitle"	No
adldx	ad index (See the "Managing Ads" section below)	"66478364"	Yes
type	type of ad ("preroll", "midroll", or "postroll")	"preroll"	Yes
length	length of ad, in seconds	"20"	No

Ad Metadata Sample

{
  "ad": {
    "assetid":"AD12345",
    "title":"ADTestTitle",
    "adldx":"1",
    "type":"preroll",
    "length":"20"
  },
}

Managing Ads

If there is an Ad block within the playing content (such as a midroll) you need to:

• Reset the playhead position to 0 for each ad.
• Call the adStop event at the end of each ad or increment the adldx

The Simplified API can automatically detect the change from ad to content as well as ad to ad if the assetID changes; however, there could be situations where the same ad is played back to back.

Sometimes it is not possible for integrators to provide different assetId value for individual ads in a sequence of ads. Taking this into account, the Simplified API will support a new parameter for ad metadata: adIdx. This parameter is an index of an individual ad in a sequence of ads. Once the next ad is started the adIdx parameter should be changed and provided as part of ad metadata. You can either increment/change the adldx value, and/or call adStop at the end of each Ad.

            // Example of passing both values
            self.data.updateValue("adStop", forKey: "event")
            self.data.updateValue("223", forKey: "adldx")
            self.nielsenEventTracker.trackEvent(data)

Static Metadata

Key	Description	Values	Required
type	type identifier	"static"	Yes
assetid	unique ID assigned for each article/section	"AID885-9984"	Yes
section	Unique Value assigned to page/site section	"homeSection"	Yes
segA	name of program (25 character limit); limit to 25 unique values across custom segments (segA + segB + segC)	"CustomSegmentValueA"	Yes
segB	custom segment B; limit to 25 unique values across custom segments (segA + segB + segC)	"CustomSegmentValueB"	No
segC	custom segment C; limit to 25 unique values across custom segments (segA + segB + segC)	"CustomSegmentValueC"	No

{
    "static":
            {
                "type": "static",
                "section": "homeSection",
                "assetid": "AID885-9984",
                "segA": "CustomSegmentValueA",
                "segB": "CustomSegmentValueB",
                "segC": "CustomSegmentValueC",
            }
        },

Putting it all together

Swift

      func loadPreRollAd() -> [String : Any] {
        
        //Loading Ad data
        
        url = NSURL(string: "http://www.nielseninternet.com/NWCC-3002/prog_index.m3u8")
        
        let content = [
            "assetName":"Big Buck Bunny",
            "assetid":"B66473",
            "length":"3600",
            "program":"MyProgram",
            "segB":"CustomSegmentValueB",
            "segC":"segmentC",
            "title":"S2,E3",
            "type":"content",
            "section":"app_Mainpage",
            "airdate":"20180120 10:00:00",
            "isfullepisode":"y",
            "crossId1":"Standard Episode ID",
            "crossId2" :"Content Originator",
            "adloadtype":"2"
        ]
           
        let staticObj = [
            "type":"static",
            "section":"homeSection",
            "segA":"CustomSegmentValueA",
            "segB":"CustomSegmentValueB",
            "segC":"CustomSegmentValueC"
            ]

        let ad = [
            "assetid":"AD12345",
            "title":"ADTestTitle",
            "adldx":"1",
            "type":"preroll",
            "length":"20"
        ]
        
        let metadata = [
            "content" : content,
            "ad" : ad,
            "static" : staticObj
            ] as [String : Any]
        
        
        let data = [
            "metadata" : metadata,
            "event": "playhead",
            "playheadPosition": "0",
            "type": "ad",
            ] as [String : Any]
        
        return data    
    }

Objective C

 
#import <Foundation/Foundation.h>
#import "SDKMethods.h"

@implementation SDKMethods
//Loading content Data
- (NSDictionary *)loadContentData
{
- (NSDictionary *)loadPreRollAd
{
    self.url = [NSURL URLWithString:@"http://www.nielseninternet.com/NWCC-3002/prog_index.m3u8"];
    
    //We should pass content dictionary also in Ad video.
    NSDictionary *content = @{  @"assetName":@"ChromeCast1",
                                @"assetid":@"C77664",
                                @"length":@"3600",
                                @"program":@"MyProgram",
                                @"segB":@"CustomSegmentValueB",
                                @"segC":@"segmentC",
                                @"title":@"S2,E3",
                                @"type":@"content",
                                @"section":@"app_Mainpage",
                                @"airdate":@"20180120 10:00:00",
                                @"isfullepisode":@"y",
                                @"adloadtype":@"2",
                                @"channelName":@"My Channel 1",
                                @"pipMode":@"false" };
    
    NSDictionary *ad = @{ @"assetid":@"AD12345",
                          @"title":@"ADTestTitle",
                          @"type":@"preroll",
                          @"length":@"20" };

   NSDictionary *staticObj = @{ @"type":@"static",
                               @"section":@"homeSection",
                               @"segA":@"CustomSegmentValueA",
                               @"segB":@"CustomSegmentValueB",
                               @"segC":@"CustomSegmentValueC" };
    
    //static data should be empty in Ad video
    NSDictionary *metadata = @{  @"content" : content,
                                 @"ad" : ad,
                                 @"static" :  @staticObj };
    
    NSDictionary *data = @{  @"metadata" : metadata,
                             @"event": @"playhead",
                             @"type": @"ad",
                             @"playheadPosition": @"0" };
    
    return data;
}

JSON examples

Additional JSON examples such as:

• Static Metadata Only
• Ad Metadata Example
• ID3 payload for DTVR
• Sample Pause Event
• Sample Complete Event

Handling Foreground and Background states

For iOS, background/foreground detection is handled by the app lifecylce APIs which are provided by Apple:

Foreground/Background state measurement is a requirement of Nielsen AppSDK implementation which is especially crucial for static measurement.

Privacy and Opt-Out

There are currently 3 flavors of the Nielsen SDK. Please check the "Implementation" section for a comparison of the three flavors. Implementing opt-out for the three flavors are different:

1. Global iOS SDK Opt-out - managed by AppTracking or Limit Ad Tracking setting on device.
2. Global iOS SDK No Ad Framework Opt-out - Direct call to SDK. Can be used without the Ad Framework.
3. Global iOS SDK No ID Opt-out - Direct call to SDK. Should be used for Kids Category.

Global iOS SDK Opt-out

OS-level Opt-out method available on Nielsen iOS

The Nielsen SDK automatically leverages the iOS's Limit Ad Tracking or AppTracking setting.

• If the User's device is running < iOS 13.x, the Nielsen SDK will check the status of Limit Ad Tracking.
• iOS14 modifies the way Apple manages the collection of a User's Opt-In status through AppTracking. Starting with Version 8.x+, the Nielsen App SDK will check the iOS version during initialization. If the device is running iOS12 or iOS13, the Limit Ad Tracking setting is requested. If iOS14.x +, then AppTracking is utilized.

Webview Element

It is a requirement to display a WebView element whose loadUrl is set to the value obtained from optOutURL. If using the Global iOS SDK, this optOutURL informs the user how to deactivate/activate “App Tracking/Limit Ad Tracking”.

If you are implementing on AppleTV here are your Opt Out verbiage options : https://engineeringportal.nielsen.com/docs/DCR_Video_%26_Static_CTV_Device_SDK_Privacy

Sample Code for Global Build

Swift

import UIKit
import WebKit
import NielsenAppApi

class OptOutVC: UIViewController, NielsenAppApiDelegate, WKNavigationDelegate {
    var nielsenApi : NielsenAppApi!
    var webView: WKWebView!
   
    override func loadView() {
        webView = WKWebView()
        webView.navigationDelegate = self
        view = webView
    }

    override func viewDidLoad() {
        super.viewDidLoad()

    if let appApi = self.nielsenApi {
            //Getting the optPut URL from SDK
            if let url = URL(string: appApi.optOutURL) {
                webView.load(URLRequest(url: url))
                webView.allowsBackForwardNavigationGestures = true
            }}}

        func closeOptOutView() {
            self.dismiss(animated: true, completion: nil)
        }}

Objective-C

#import "OptOutVC.h"
#import "NielsenInit.h"
#import <NielsenAppApi/NielsenAppApi.h>

@interface OptOutVC ()

@property (weak, nonatomic) IBOutlet UIWebView *webView;
@end

@implementation OptOutVC

- (void)viewDidLoad {
    [super viewDidLoad];

- (void)viewDidLoad {
    [super viewDidLoad];
    //Getting the optPut URL from eventTracker
    [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL
 URLWithString:self.nielsenApi.optOutURL]]];
}}

Global iOS SDK No Ad Framework Opt-out

The User Choice method can be used without the Ad Framework, or in situations where the publisher does not wish to use the App Tracking Transparency Framework. As this flavor of the Nielsen SDK does not use the Ad Framework, so it is necessary to display an Optout Page to the user and capture their selection.

Similar to the Global iOS SDK Flavor, it is a requirement to display a WebView element whose loadUrl is set to the value obtained from optOutURL. This is a special URL that indicates Opt-in, or Opt-out and close the WebView. The steps are as follows:

• Get the Nielsen opt-out URL via optOutURL
• Display a WebView element whose loadUrl is set to the value obtained from optOutURL
• Detect if the WebView URL changes to a special URL that indicates Opt-in, or Opt-out and close the WebView
  • Opt-out if the WebView URL = nielsenappsdk://1
  • Opt-in if the WebView URL = nielsenappsdk://0
• Pass the detected URL to the userOptOut function
  • Example:

    NielsenAppApi?.userOptOut("nielsenappsdk://1"); // User opt-out
    

Sample code for No Ad Framework Build

Swift

import UIKit
import WebKit
import NielsenAppApi

class OptOutVC: UIViewController, NielsenAppApiDelegate, WKNavigationDelegate {
    var nielsenApi : NielsenAppApi!
    var webView: WKWebView!
   
    override func loadView() {
        webView = WKWebView()
        webView.navigationDelegate = self
        view = webView
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        if let appApi = self.nielsenApi {
            //Getting the optPut URL from SDK
            if let url = URL(string: appApi.optOutURL) {
                webView.load(URLRequest(url: url))
                webView.allowsBackForwardNavigationGestures = true
            }}}

        func closeOptOutView() {
            self.dismiss(animated: true, completion: nil)
        }

        func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: 
@escaping (WKNavigationActionPolicy) -> Void) {
            print(navigationAction.request.url?.absoluteString as Any) //For debugging to check what is being passed from webpage.
            if navigationAction.request.url?.absoluteString == "nielsen://close" {
                closeOptOutView()
                decisionHandler(.cancel)
            } else {
                if let url = navigationAction.request.url?.absoluteString, url.hasPrefix("nielsen") {
                    nielsenApi?.userOptOut(url). //either nielsenappsdk://1 or nielsenappsdk://0
                    decisionHandler(.cancel)
                } else {
                    if navigationAction.navigationType == .linkActivated {
                        if let url = navigationAction.request.url?.absoluteString, url.hasSuffix("#") {
                            decisionHandler(.allow)
                        } else {
                            decisionHandler(.cancel)
                            webView.load(navigationAction.request)
                        }
                    } else {
                        decisionHandler(.allow)
                    }}}}

}

Objective-C

#import "OptOutVC.h"
#import "NielsenInit.h"
#import <NielsenAppApi/NielsenAppApi.h>

@interface OptOutVC ()

@property (weak, nonatomic) IBOutlet UIWebView *webView;
@end

@implementation OptOutVC

- (void)viewDidLoad {
    [super viewDidLoad];

- (void)viewDidLoad {
    [super viewDidLoad];
    //Getting the optPut URL from eventTracker
    [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL
 URLWithString:self.nielsenApi.optOutURL]]];
}
     
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction
 decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
{
    if ([navigationAction.request.URL.absoluteString isEqualToString:kNielsenWebClose])
    {   [self performSelector:@selector(closeOptOutView) withObject:nil afterDelay:0];
        decisionHandler(WKNavigationActionPolicyCancel); 
     } else {
        if ([navigationAction.request.URL.absoluteString hasPrefix:@"nielsen"])
        {[self.nielsenAppApi userOptOut:navigationAction.request.URL.absoluteString];
            decisionHandler(WKNavigationActionPolicyCancel); 
        } else {
            if (navigationAction.navigationType == WKNavigationTypeLinkActivated) 
            { if ([navigationAction.request.URL.absoluteString hasSuffix:@"#"]) 
                      {decisionHandler(WKNavigationActionPolicyAllow);
                } else {
                    decisionHandler(WKNavigationActionPolicyCancel);
                    [webView loadRequest:[NSURLRequest requestWithURL:navigationAction.request.URL]];
                }} else {
                 decisionHandler(WKNavigationActionPolicyAllow);
            }}}
}

Global iOS SDK No ID Opt-out

If you are building an app that will be listed in the Kids Category:

1. Ensure that you are using the NoID version of the Nielsen SDK Framework.
2. Immediately following the initialization of the Nielsen SDK ensure you call the userOptOut API with Opt out selection:

NielsenAppApi?.userOptOut("nielsenappsdk://1"); // User opt-out

Retrieve current Opt-Out preference

Whether the user is opted out via OS-level Opt-out or via User Choice Opt-out, the current Opt-Out status as detected by the SDK is available via the optOutStatus property in the Nielsen SDK API

@property (readonly) BOOL optOutStatus

Example Code

Putting it all together

The below code was built to show the functionality of the Nielsen Simplified API using a standard no-frills player. An Advanced Player is available with the SDK Bundle.

Swift

Swift Code Example

Select the below link to download the sample files
Download Project Files

NielsenInit.swift

// This is sample code of a very basic implementation of the Nielsen 'Simplified API'
// This code is for educational purposes only
//
import Foundation
import NielsenAppApi

class NielsenInit : NSObject {
    class func createEventTracker(delegate: NielsenEventTrackerDelegate) -> NielsenEventTracker?{
    
        //Initialising the NielsenEventTracker class by passing app information which returns the instance of NielsenEventTracker.
        
        var nielsenEventTracker: NielsenEventTracker?
        
        let appInformation = [
  
            "appid": "PDA7D5EE6-B1B8-4123-9277-2A788XXXXXXX",
            "appversion": "1.0",
            "appname": "Amazing app",
            "sfcode": "dcr",
            "nol_devDebug": "DEBUG"
        ]
        
        nielsenEventTracker = NielsenEventTracker(appInfo:appInformation, delegate:delegate)
        return nielsenEventTracker
    }
}

SDKMethods.swift

import Foundation

class SDKMethods : NSObject {
    
    var nielsenApi : NielsenAppApi!
    var url = NSURL(string: "")
    var content : NSDictionary!
    
    //Loading Static Data
    func loadStatic() -> [String : Any] {
        
        let staticObj = [
            "type":"static",
            "section":"homeSection",
            "segA":"CustomSegmentValueA",
            "segB":"CustomSegmentValueB",
            "segC":"CustomSegmentValueC"]

        
        let metadata = [
            "content" : [String:String](),
            "ad" : [String:String](),
            "static" :  staticObj ] as [String : Any]
        
        let data = [
            "metadata" : metadata,
            "event": "playhead",
            "type": "static",
            "playheadPosition": "0" ] as [String : Any]
        
        return data
    }

//Loading content Data
func loadContent() -> [String : Any] {
    
    url = NSURL(string: "http://www.nielseninternet.com/NielsenConsumer/prog_index.m3u8")
    
    let content = [
        "assetName":"ChromeCast1",
        "assetid":"C77664",
        "length":"3600",
        "program":"MyProgram",
        "segB":"CustomSegmentValueB",
        "segC":"segmentC",
        "title":"S2,E3",
        "type":"content",
        "section":"myApi_app",
        "airdate":"20180120 10:00:00",
        "isfullepisode":"y",
        "adloadtype":"2",
        "channelName":"My Channel 1",
        "pipMode":"false" ]
    
    //Ad data,static data should be empty in content video dictionary
    let metadata = [
        "content" : content,
        "ad" : [String:String](),
        "static" :  [String:String]() ] as [String : Any]
    
    let data = [
        "metadata" : metadata,
        "event": "playhead",
        "type":"content",
        "playheadPosition": "0" ] as [String : Any]
    
    return data

  }
}

ViewController.swift

import UIKit
import AVKit
import CoreLocation
import AdSupport
import AVFoundation
import NielsenAppApi

class ViewController: UIViewController, NielsenEventTrackerDelegate, AVPlayerViewControllerDelegate {
    
    var videoType : Int!
    var player : AVPlayer!
    var playerController : AVPlayerViewController!
    var sdkMethods : SDKMethods!
    var nielsenEventTracker : NielsenEventTracker!
    
    var data : [String : Any]!
    var timeObserver: Any!
    var totalVideosPlayed = 0
    var totalVideos : Int!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        //Mark: In NielsenInit class we are initialising the NielsenEventTracker.
        
        //Getting the instance of NielsenEventTracker
        self.nielsenEventTracker = NielsenInit.createEventTracker(delegate: self)
        
        //Mark: In SDKMethods class we wrote methods which creates content,Ad objects
        sdkMethods = SDKMethods()
        
        if(videoType == Constants.onlyContent){
            //loading video content data
            self.data = sdkMethods.loadContent()
        }else{
            //loading Ad data
            self.data = sdkMethods.loadPreRollAd()
        }
        
        setPlayer()
        setPlayHeadPosition()
        
        //Setting observer to know the completion of video
        setVideoFinishObserver()
    }
    
    override func viewDidAppear(_ animated: Bool) {
        //loading static data
        let staticData = sdkMethods.loadStatic()
        
        //sending static data to SDK.
        self.nielsenEventTracker.trackEvent(staticData)
    }
    
    func setPlayer() {
        
        //creating player
        player  = AVPlayer.init(url: sdkMethods.url! as URL)
        playerController = AVPlayerViewController()
        playerController.view.frame = CGRect(x:0 , y:100, width: self.view.frame.width, height: 300)
        playerController.player = player;
        playerController.showsPlaybackControls = true;
        playerController.delegate = self;
        
        //Adding observer to player to track play,pause and reverse
        player.addObserver(self, forKeyPath: "rate", options: NSKeyValueObservingOptions.new, context: nil)
        player.play()
        
        self.addChildViewController(playerController)
        self.view.addSubview(playerController.view)
    }
    
    func setPlayHeadPosition() {
        
        //Setting play head position
        let timeInterval : CMTime = CMTimeMakeWithSeconds(1.0, 10)
        playerController.player?.addPeriodicTimeObserver(forInterval: timeInterval, queue: DispatchQueue.main) {(elapsedTime: CMTime) -> Void in
            
            let time : Float64 = self.playerController.player!.currentTime().seconds;
            let pos = Int64(time);
            let playHeadPos = String(pos)
            
            //updating playHead position in dictionary.
            self.data.updateValue(playHeadPos, forKey: "playheadPosition")
            
            //Sending data dictionary to SDK with updated playHead position.
            self.nielsenEventTracker.trackEvent(self.data)
        }
    }
    
    func setVideoFinishObserver() {
        
        //observer fires on completion of Video
        NotificationCenter.default.addObserver(self, selector: #selector(playerDidFinishPlaying), name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: playerController.player?.currentItem)
    }
    
    //rate 0.0 = Video Pause or stopped
    //rate 1.0 = Video played or resumed
    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        if keyPath == "rate" {
            if let rate = change?[NSKeyValueChangeKey.newKey] as? Float {
                
                if rate == 0.0 {
                    print("Playback stopped")
                    
                    //on video pause, updating event as pause in dictionary
                    self.data.updateValue("pause", forKey: "event")
                    
                    //sending the dictionary to SDK with "pause" event.
                    self.nielsenEventTracker.trackEvent(self.data)
                }
                if rate == 1.0 {
                    print("normal playback")
                    
                    //On Play resume setting event as Playhead
                    self.data.updateValue("playhead", forKey: "event")
                }
            }
        }
    }
    
    override func viewDidDisappear(_ animated: Bool) {
        
        //on moving to other screen, updating event as pause in dictionary
        self.data.updateValue("pause", forKey: "event")
        
        player.rate = 0
        player.pause()
    }
    
    @objc func playerDidFinishPlaying(note: NSNotification) {
        
        self.player?.removeObserver(self, forKeyPath: "rate")
        
        //As 1 video completed playing, incrementing the variable value.
        totalVideosPlayed += 1
        
        if(videoType == Constants.onlyContent || totalVideosPlayed == totalVideos){
            //When content video completes or total videos finishs, let's send complete event to SDK
            sendCompleteEventToSDK()
        }else{
            //On completion of Ad updating "adStop" event to SDK.
            self.data.updateValue("adStop", forKey: "event")
            
            //sending "adStop" event to SDK.
            self.nielsenEventTracker.trackEvent(data)
        }
        
        //Checking if total videos played or not.
        if(totalVideosPlayed != totalVideos){
            
            //Checking if videoType is contentWithOneAd, then after completion of Ad, will play the content video.
            if(videoType == Constants.contentWithOneAd){
                
                //loading video content data
                self.data = sdkMethods.loadContent()
            }else if(videoType == Constants.contentWithTwoAds){
                if(totalVideosPlayed == 1){
                    
                //loading 2nd Ad data
                self.data = sdkMethods.loadMidRollAd()
                }else{

                    //loading video content data
                    self.data = sdkMethods.loadContent()
                }
            }
            setPlayer()
            
            //Adding observer to player to check is buffering finished
            self.timeObserver = player.addPeriodicTimeObserver(forInterval: CMTime(value: 1, timescale: 3), queue: DispatchQueue.main) { [weak self] time in
                
                //checking the video player status
                self?.handlePlayerStatus(time: time)
                self?.setPlayHeadPosition()
                
                //Setting observer to know the completion of video
                self?.setVideoFinishObserver()
                
            }
        }
    }
    
    func handlePlayerStatus(time: CMTime) {
        if player.status == .readyToPlay {
            
            // buffering is finished, setting event as Playhead
            self.data.updateValue("playhead", forKey: "event")
            player.removeTimeObserver(self.timeObserver)
        }
        if player.status == .unknown{
            print("Buffering")
        }
    }
    
    func sendCompleteEventToSDK(){
        
        //onCompletion of video, updating event as complete in dictionary
        self.data.updateValue("complete", forKey: "event")
        
        //sending the dictionary to SDK with "complete" event.
        self.nielsenEventTracker.trackEvent(self.data)
    }
    
    deinit {
        
        print("Remove NotificationCenter Deinit")
        NotificationCenter.default.removeObserver(self)
    }
}

Objective C

Objective-C Code Example

Select the below link to download the sample files
Download Project Files

NielsenInit.m

//  NielsenInit.m
//  VideoPlayerAppObjC
// This is sample code of a very basic implementation of the Nielsen 'Simplified API'
// This code is for educational purposes only


#import "NielsenInit.h"
#import <NielsenAppApi/NielsenEventTracker.h>

@implementation NielsenInit

+ (NielsenEventTracker *)createNielsenEventTrackerWithDelegate:(id<NielsenEventTrackerDelegate>)delegate
{
    //Initialising the NielsenEventTracker class by passing app information which returns the instance of NielsenEventTracker.
    
    NSDictionary *appInformation = @{ @"appid": @"PDA7D5EE6-B1B8-4123-9277-2A788BC6XXXX",
                            @"appversion": @"1.0",
                            @"appname": @"Abdul's Objc Test app",
                            @"sfcode": @"dcr",
                            @"ccode": @"123",
                            @"dma":@"456",
                            @"uoo":@"0",
                            @"nol_devDebug": @"INFO",
                            @"containerId": @"1" };
    
    return [[NielsenEventTracker alloc] initWithAppInfo:appInformation delegate:delegate];
}


@end

NielsenInit.h

#import <Foundation/Foundation.h>

@class NielsenEventTracker;
@protocol NielsenEventTrackerDelegate;

@interface NielsenInit : NSObject

+ (NielsenEventTracker *)createNielsenEventTrackerWithDelegate:(id<NielsenEventTrackerDelegate>)delegate;

@end

SDKMethods.m

#import <Foundation/Foundation.h>
#import "SDKMethods.h"


@implementation SDKMethods

//Loading content Data
- (NSDictionary *)loadContentData
{
    
    self.url = [NSURL URLWithString:@"http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ForBiggerEscapes.mp4"];
    
    NSDictionary *content = @{  @"assetName":@"ChromeCast1",
                                @"assetid":@"C77664",
                                @"length":@"3600",
                                @"program":@"MyProgram",
                                @"segB":@"CustomSegmentValueB",
                                @"segC":@"segmentC",
                                @"title":@"S2,E3",
                                @"type":@"content",
                                @"section":@"cloudApi_app",
                                @"airdate":@"20180120 10:00:00",
                                @"isfullepisode":@"y",
                                @"adloadtype":@"2",
                                @"channelName":@"My Channel 1",
                                @"pipMode":@"false" };
    
    //Ad data,static data should be empty in content video dictionary
    NSDictionary *metadata = @{  @"content" : content,
                               @"ad" : @{},
                               @"static" :  @{} };
    
    NSDictionary *data = @{  @"metadata" : metadata,
                           @"event": @"playhead",
                           @"type": @"content",
                           @"playheadPosition": @"0" };
    
    
    
    return data;
}

//Loading Ad data
- (NSDictionary *)loadPreRollAd
{
    self.url = [NSURL URLWithString:@"http://www.nielseninternet.com/NWCC-3002/prog_index.m3u8"];
    
    //We should pass content dictionary also in Ad video.
    NSDictionary *content = @{  @"assetName":@"ChromeCast1",
                                @"assetid":@"C77664",
                                @"length":@"3600",
                                @"program":@"MyProgram",
                                @"segB":@"CustomSegmentValueB",
                                @"segC":@"segmentC",
                                @"title":@"S2,E3",
                                @"type":@"content",
                                @"section":@"cloudApi_app",
                                @"airdate":@"20180120 10:00:00",
                                @"isfullepisode":@"y",
                                @"adloadtype":@"2",
                                @"channelName":@"My Channel 1",
                                @"pipMode":@"false" };
    
    NSDictionary *ad = @{ @"assetid":@"AD12345",
                          @"title":@"ADTestTitle",
                          @"type":@"preroll",
                          @"length":@"20" };
    
    //static data should be empty in Ad video
    NSDictionary *metadata = @{  @"content" : content,
                                 @"ad" : ad,
                                 @"static" :  @{} };
    
    NSDictionary *data = @{  @"metadata" : metadata,
                             @"event": @"playhead",
                             @"type": @"ad",
                             @"playheadPosition": @"0" };
    
    return data;
}

@end

SDKMethods.h

#import <Foundation/Foundation.h>

@interface SDKMethods : NSObject

@property(nonatomic, strong) NSURL *url;

- (NSDictionary *)loadContentData;
- (NSDictionary *)loadPreRollAd;

@end

ViewController.m

#import "ViewController.h"
#import "NielsenInit.h"
#import "SDKMethods.h"
#import <MediaPlayer/MediaPlayer.h>
#import <AVKit/AVKit.h>
#import "Constants.h"

#import <NielsenAppApi/NielsenEventTracker.h>

NSMutableDictionary *mutableData;
NSDictionary *data;
SDKMethods *sdkMethods;
AVPlayer  *player;
AVPlayerViewController *playerController;
NielsenEventTracker *nielsenEventTracker;

int totalVideosPlayed = 0;
id timeObserver;

@interface ViewController()<AVPlayerViewControllerDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //Mark: In NielsenInit class we are initialising the NielsenEventTracker.
    
    //Getting the instance of NielsenEventTracker
    nielsenEventTracker = [NielsenInit createNielsenEventTrackerWithDelegate:nil];
    
    //Mark: In SDKMethods class we wrote methods which creates content,Ad objects
    sdkMethods = [[SDKMethods alloc] init];
    
    if(self.videoType == onlyContent){
        //loading video content data
       data = [sdkMethods loadContentData];
    }else{
        //loading Ad data
        data = [sdkMethods loadPreRollAd];
    }
    
    //Converting "data" to mutable dictionary as we have to update playhead, event values.
    mutableData =[data mutableCopy];
    
    [self setPlayer];
    [self setPlayHeadPosition];
    
    //Setting observer to know the completion of video
    [self setVideoFinishObserver];
}

-(void) setPlayer {
    
    //creating player
    player = [AVPlayer playerWithURL:[sdkMethods url]];
    playerController = [[AVPlayerViewController alloc] init];
    playerController.view.frame = CGRectMake(0,100,self.view.frame.size.width,300);
    playerController.player = player;
    playerController.showsPlaybackControls = YES;
    playerController.delegate = self;
    
    //Adding observer to player to track play,pause and reverse
    [player addObserver:self
              forKeyPath:@"rate"
                 options:(NSKeyValueObservingOptionNew)
                 context:nil];
    
    [player play];
    
    [self addChildViewController:playerController];
    [self.view addSubview:playerController.view];
}

-(void) setPlayHeadPosition {
    
    //Setting play head position
    CMTime timeInterval = CMTimeMakeWithSeconds(1, 1);
    [player addPeriodicTimeObserverForInterval:(timeInterval) queue:dispatch_get_main_queue() usingBlock:^(CMTime time){
        NSTimeInterval seconds = CMTimeGetSeconds(time);
        NSInteger intSec = seconds;
        NSString* strSec = [NSString stringWithFormat:@"%li", intSec];
        
        //updating playHead position in dictionary.
        [mutableData setValue:strSec forKey:@"playheadPosition"];
        
        //Sending data dictionary to SDK with updated playHead position.
        [nielsenEventTracker trackEvent:mutableData];
    }];
}

- (void) setVideoFinishObserver {
    
    //observer fires on completion of Ad
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(itemDidFinishPlaying:) name:AVPlayerItemDidPlayToEndTimeNotification object:playerController.player.currentItem];
}

//rate 0.0 = Video Pause or stopped
//rate 1.0 = Video played or resumed
//rate -1.0 = Play reversed/rewind.
- (void)observeValueForKeyPath:(NSString *)keyPath
                      ofObject:(id)object
                        change:(NSDictionary *)change
                       context:(void *)context
{
    if (object == player && [keyPath isEqualToString:@"rate"]) {
        NSNumber * newValue = [change objectForKey:NSKeyValueChangeNewKey];
        int intValue = newValue.intValue;
        if(intValue == 0){
            NSLog(@"playback paused");
            
            //on video pause, updating event as pause in dictionary
            [mutableData setValue:@"pause" forKey:@"event"];
            
            //sending the dictionary to SDK with "pause" event.
            [nielsenEventTracker trackEvent:mutableData];
            
        }else if(intValue == 1){
            NSLog(@"Normal playback");
            
            //On Play resume setting event as Playhead
            [mutableData setValue:@"playhead" forKey:@"event"];
            
        }
    }
}

- (void)viewDidDisappear:(BOOL)animated
{
    //on moving to other screen, updating event as pause in dictionary
    [mutableData setValue:@"pause" forKey:@"event"];
    
    //As it is a pause event setting the playheadPosition to empty.
    [mutableData setValue:@"" forKey:@"playheadPosition"];
    
    player.rate = 0;
    [player pause];
    
    [super viewDidDisappear:animated];
}


-(void)itemDidFinishPlaying:(NSNotification *) notification {
    
    [player removeObserver:self forKeyPath:@"rate"];
    
    [self sendCompleteEventToSDK];
    
    //As 1 video completed playing, incrementing the variable value.
    totalVideosPlayed += 1;
    
    //Checking if total videos played or not.
    if(totalVideosPlayed != self.totalVideos){
        
        //Checking if videoType is contentWithAd, then after completion of Ad, will play the content video.
        if(self.videoType == contentWithAd){
            
            //loading video content data
            data = [sdkMethods loadContentData];
            
            mutableData =[data mutableCopy];
            
            [self setPlayer];
            
            //Adding observer to player to check is buffering finished
            CMTime timeInterval = CMTimeMakeWithSeconds(1, 3);
            timeObserver =  [player addPeriodicTimeObserverForInterval:(timeInterval) queue:dispatch_get_main_queue() usingBlock:^(CMTime time){
                
                //checking the video player status
                [self handlePlayerStatus:time];
                [self setPlayHeadPosition];
                //Setting observer to know the completion of video
                [self setVideoFinishObserver];
                
            }];
            
        }
    }
}

- (void) handlePlayerStatus : (CMTime) time {
    
    if(player.status == AVPlayerItemStatusReadyToPlay){
        
        // buffering is finished, setting event as Playhead
        [mutableData setValue:@"playhead" forKey:@"event"];
        [player removeTimeObserver:timeObserver];
    }
}

- (void) sendCompleteEventToSDK {
    
    //onCompletion of video, updating event as complete in dictionary
    [mutableData setValue:@"complete" forKey:@"event"];
    
    //As it is a complete event setting the playheadPosition to empty.
    [mutableData setValue:@"" forKey:@"playheadPosition"];
    
    //sending the dictionary to SDK with "complete" event.
    [nielsenEventTracker trackEvent:mutableData];
}

- (void)dealloc {
    NSLog(@"Remove NotificationCenter dealloc");
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}
@end

ViewController.h

#import <UIKit/UIKit.h>

@class NielsenEventTracker;
@protocol NielsenEventTrackerDelegate;


@interface ViewController : UIViewController

@property (nonatomic) int videoType;
@property (nonatomic) int totalVideos;

@end

OptOutVC.m

#import "OptOutVC.h"
#import "NielsenInit.h"


#import <NielsenAppApi/NielsenEventTracker.h>

@interface OptOutVC ()

@property (weak, nonatomic) IBOutlet UIWebView *webView;

@end

@implementation OptOutVC

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.nielsenEventTracker = [NielsenInit createNielsenEventTrackerWithDelegate:nil];
    
    //Getting the optPut URL from eventTracker
    [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:self.nielsenEventTracker.optOutURL]]];
}

@end

OptOutVC.h

#import <UIKit/UIKit.h>

@class NielsenEventTracker;
@protocol NielsenEventTrackerDelegate;

@interface OptOutVC : UIViewController

@property (nonatomic, weak) NielsenEventTracker *nielsenEventTracker;

@end