The RudderStack iOS SDK lets you track the customer event data from your iOS, macOS, tvOS, and watchOS applications and send it to the specified destinations via RudderStack.

SDK setup requirements

To set up the RudderStack iOS SDK, the following prerequisites must be met:

• You need to set up a RudderStack account.
• Once signed up, set up an iOS source in the dashboard. You should be able to see a Write Key for this source, as shown below:

• You also need a data plane URL. Refer to the Glossary for more information on the data plane URL and where to find it.

• Finally, you need a Mac with the latest version of Xcode.

Installing the RudderStack iOS SDK

The RudderStack iOS SDK is distributed through Cocoapods and Carthage.

Follow these steps to install the SDK depending on your preferred method:

Remember to include the following code in all the .m and .h files (Objective-C) or the .swift files where you want to refer to or use the RudderStack SDK classes:

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@import Rudder;

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import Rudder

Initializing the RudderStack client

To initialize the RudderStack client, place the following code in your AppDelegate file under the didFinishLaunchingWithOptions method:

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RSConfig *config = [[RSConfig alloc] initWithWriteKey:WRITE_KEY];
[config dataPlaneURL:DATA_PLANE_URL];
[config trackLifecycleEvents:YES];
[config recordScreenViews:YES];

[[RSClient sharedInstance] configureWith:config];

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let config: RSConfig = RSConfig(writeKey: WRITE_KEY)
                  .dataPlaneURL(DATA_PLANE_URL)
                  .trackLifecycleEvents(true)
                  .recordScreenViews(true)
        
RSClient.sharedInstance().configure(with: config)

Configuring the RudderStack client

You can configure your client based on the following parameters using RSConfig:

Self-hosted control plane

If you are using a device mode destination like Adjust, Firebase, etc., the SDK needs to fetch the required configuration from the control plane. If you are using the Control Plane Lite utility to host your own control plane, then follow the steps in this section and specify controlPlaneUrl in RSConfig that points to your hosted source configuration file.

Supported API calls

The iOS SDK supports all the API calls specified in the RudderStack Events Spec guide. These include identify, track, screen, group, alias, and reset calls.

Identify

The identify call lets you identify a visiting user and associate them to their actions. It also lets you record the traits about them like their name, email address, etc. Once you identify the user, the SDK persists all the user information and passes it on to the subsequent track or screen calls. To reset the user identification, you can use the reset method.

An sample identify call is shown below:

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[[RSClient sharedInstance] identify:@"user_id" traits:@{@"email": @"alex@example.com"}];

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RSClient.sharedInstance().identify("user_id", traits: ["email": "alex@example.com"])

The identify method accepts the following parameters:

Setting your own anonymous ID

By default, RudderStack uses the deviceId as anonymousId. To set your own anonymousId, you can use the setAnonymousId method as shown:

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[client setAnonymousId:@"new_anonymous_id"];

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RSClient.sharedInstance().setAnonymousId("new_anonymous_id")

Setting an external ID

You can pass your custom userId along with the standard userId in your identify calls. RudderStack adds these values under context.externalId.

The following code snippet highlights how you can add externalId to your identify requests:

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RSOption *eventOption = [[RSOption alloc] init];
[eventOption putExternalId:@"brazeExternalId" withId:@"some_external_id_1"];
    
[[RSClient sharedInstance] identify:@"user_id" traits:@{@"email": @"alex@example.com"} option:eventOption];

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let messageOption = RSOption()
messageOption.putExternalId("brazeExternalId", withId: "some_external_id_1")

RSClient.sharedInstance().identify("user_id", traits: ["email": "alex@example.com"], option: messageOption)

Track

The track call lets you record the user events along with any properties associated with them.

A sample track event is shown below:

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[[RSClient sharedInstance] track:@"sample_track_event" properties:@{
    @"key_1": @"value_1",
    @"key_2": @"value_2"
}];

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RSClient.sharedInstance().track("sample_track_event", properties: [
    "key_1": "value_1",
    "key_2": "value_2"
])

The track method accepts the following parameters:

Screen

The screen call lets you record whenever a user views their mobile screen, with any additional relevant information about the screen.

A sample screen event is as shown:

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[[RSClient sharedInstance] screen:@"ViewController" properties:@{
  @"key_1": @"value_1",
  @"key_2": @"value_2"
} ];

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RSClient.sharedInstance().screen("ViewController", properties: [
    "key_1": "value_1",
    "key_2": "value_2"
])

The screen method accepts the following parameters:

Group

The group call lets you link an identified user with a group like a company, organization, or an account. It also lets you record any traits associated with that group, like the name of the company, number of employees, etc.

A sample group call is shown below:

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[[RSClient sharedInstance] group:@"sample_group_id" traits:@{
  @"key_1": @"value_1",
  @"key_2": @"value_2"
} ];

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RSClient.sharedInstance().group("sample_group_id", traits: [
  "key_1": "value_1",
  "key_2": "value_2"
])

The group method accepts the following parameters:

Alias

The alias call associates the user with a new identification. A sample alias call is shown below:

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[[RSClient sharedInstance] alias:@"new_user_id"];

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RSClient.sharedInstance().alias("new_user_id")

Alternatively, you can use the following method signature:

Reset

You can use the reset method to clear the persisted user traits from the identify call. This is required for the user logout operation.

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[[RSClient sharedInstance] reset];

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RSClient.sharedInstance().reset()

Enabling/disabling user tracking via the setOptOutStatus API (GDPR support)

RudderStack gives the users (for example, an EU user) the ability to opt out of tracking any user activity until they give their consent. You can do this by leveraging RudderStack's setOptOutStatus API.

The setOptOutStatus API takes YES/NO (Objective-C) or true/false (Swift) as a Boolean value to enable or disable the user tracking activities. This flag persists across device reboots.

The following snippet highlights the use of the setoptOutStatus API to disable user tracking:

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[[RSClient sharedInstance] setOptOutStatus:YES];

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RSClient.sharedInstance().setOptOutStatus(true)

Once the user grants their consent, you can enable user tracking once again using the setOptOutStatus API by passing NO or false, as shown:

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[[RSClient sharedInstance] setOptOutStatus:NO];

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RSClient.sharedInstance().setOptOutStatus(false)

Supporting push notifications for device mode destinations

With the iOS SDK, you need not call the individual destination's API in your app to implement the push notifications support; calling the SDK's push notification API is sufficient.

To enable push notifications for your device mode destinations, the SDK provides the following functions:

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- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken;

- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error;

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult result))completionHandler;

- (void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void(^)(void))completionHandler;

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- func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data)

- func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error)

- func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void)

- func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void)

To implement these functions, go to your AppDelegate file and add the following lines:

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- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
    [[RSClient sharedInstance] application:application didRegisterForRemoteNotificationsWithDeviceToken:deviceToken];
}

- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error {
    [[RSClient sharedInstance] application:application didFailToRegisterForRemoteNotificationsWithError:error];
}

- (void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void(^)(void))completionHandler {
    [[RSClient sharedInstance] userNotificationCenter:center didReceive:response withCompletionHandler:completionHandler];
}

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler {
    [[RSClient sharedInstance] application:application didReceiveRemoteNotification:userInfo fetchCompletionHandler:completionHandler];
}

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- func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    RSClient.sharedInstance().application(application, didRegisterForRemoteNotificationsWithDeviceToken: deviceToken)
}

- func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
    RSClient.sharedInstance().application(application, didFailToRegisterForRemoteNotificationsWithError: error)
}

- func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
    RSClient.sharedInstance().userNotificationCenter(center, didReceive: response, withCompletionHandler: completionHandler)
}

- func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
    RSClient.sharedInstance().application(application, didReceiveRemoteNotification: userInfo, fetchCompletionHandler: completionHandler)
}

Setting the device token for push notifications

To pass push notifications to the destinations that support it, you can pass your device token using the setDeviceToken method, as shown:

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[[RSClient sharedInstance] setDeviceToken:@"example_device_token"];

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RSClient.sharedInstance().setDeviceToken("example_device_token")

Setting the advertisement ID

RudderStack separates the IDFA collection from the core library so that you have better control over it.

You can pass the IDFA to the setAdvertisementId method to set it under context.device.advertisingId, as shown:

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[[RSClient sharedInstance] setAdvertisingId:[self getIDFA]];

- (NSString*)getIDFA {
    return [[[ASIdentifierManager sharedManager] advertisingIdentifier] UUIDString];
}

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RSClient.sharedInstance().setAdvertisingId(getIDFA())

func getIDFA() -> String {
        return ASIdentifierManager.shared().advertisingIdentifier.uuidString
}

ATTrackingManager authorization consent

You can pass ATTrackingManager.trackingAuthorizationStatus to RudderStack and it is passed along to the relevant destinations as configured.

For example, AppsFlyer accepts this parameter for the attribution to work in their server-to-server events flow.

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[[RSClient sharedInstance] setAppTrackingConsent:RSAppTrackingConsentAuthorize];

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RSClient.sharedInstance().setAppTrackingConsent(.authorize)

You can pass the following options to the setAppTrackingConsent method to set the relevant authorization consent:

• RSATTNotDetermined
• RSATTRestricted
• RSATTDenied
• RSATTAuthorize

Filtering device mode events

When sending events to a destination via the device mode, you can explicitly specify which events should be discarded or allowed to flow through - by allowlisting or denylisting them.

Enabling/disabling events for specific destinations

The RudderStack iOS SDK lets you enable or disable event flow to a specific destination or all the destinations to which the source is connected. You can specify these destinations by creating a RSOption object as shown:

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RSOption *option = [[RSOption alloc]init];
//default value for `All` is true
[option putIntegration:@"All" isEnabled:YES];
// specifying destination by its display name
[option putIntegration:@"Amplitude" isEnabled:YES];
[option putIntegration:@"<DESTINATION_DISPLAY_NAME>" isEnabled:<BOOLEAN>];

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let option:RSOption = RSOption();
//default value for `All` is true
option.putIntegration("All", isEnabled:true)
// specifying destination by its display name
option.putIntegration("Amplitude", isEnabled:true)
option.putIntegration(<DESTINATION_DISPLAY_NAME>, isEnabled:<BOOLEAN>)

You can pass the destinations specified to the SDK in the following two ways:

Method 1: Passing destinations while initializing the SDK

This approach is helpful when you want to enable/disable sending the events to the destinations across all the event calls made using the SDK.

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RSOption *defaultOption = [[RSOption alloc] init];
[defaultOption putIntegration:@"Amplitude" isEnabled:YES];

[[RSClient sharedInstance] setOption:defaultOption];

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let defaultOption = RSOption()
defaultOption.putIntegration("Amplitude", isEnabled: true)

RSClient.sharedInstance().setOption(defaultOption)

Method 2. Passing destinations while making event calls

This approach is helpful when you want to enable/disable sending only specific events to the destinations.

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RSOption *eventOption = [[RSOption alloc] init];
[eventOption putIntegration:@"Amplitude" isEnabled:YES];

[[RSClient sharedInstance] track:@"sample_track" properties:@{@"key_1": @"value_1", @"key_2": @"value_2"} option:eventOption];

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let eventOption = RSOption()
eventOption.putIntegration("MoEngage", isEnabled: true)

RSClient.sharedInstance().track("sample_track", option: eventOption)

Debugging

If you run into any issues regarding the RudderStack iOS SDK, you can enable VERBOSE or DEBUG logging to determine the issue.

To enable the logging, change your RSClient initialization as shown:

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RSConfig *config = [[RSConfig alloc] initWithWriteKey:WRITE_KEY];
[config dataPlaneURL:DATA_PLANE_URL];
[config loglevel:RSLogLevelDebug];

[[RSClient sharedInstance] configureWith:config];

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let config: RSConfig = RSConfig(writeKey: WRITE_KEY)
            .dataPlaneURL(DATA_PLANE_URL)
            .loglevel(.debug)
        
RSClient.sharedInstance().configure(with: config)

Adding Chromecast support

Google Chromecast is a device that plugs into your TV or monitor with an HDMI port, and can be used to stream content from your phone or computer.

Developing a device mode destination

This section details the steps required to develop a device mode destination in case RudderStack doesn't support it already.

1. Create a RSCustomDestination.swift file by extending RSDestinationPlugin, as shown:

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class RSCustomDestination: RSDestinationPlugin {
    var key: String = "Custom"
    var controller = RSController()
    var type: PluginType = .destination
    var RSClient.sharedInstance(): RSClient?
    
    func update(serverConfig: RSServerConfig, type: UpdateType) {
        guard type == .initial else { return }
        // Some code
    }
    
    func track(message: TrackMessage) -> TrackMessage? {
        // Some code
        return message
    }
    
    func identify(message: IdentifyMessage) -> IdentifyMessage? {
        // Some code
        return message
    }
    
    func screen(message: ScreenMessage) -> ScreenMessage? {
        // Some code
        return message
    }
    
    func group(message: GroupMessage) -> GroupMessage? {
        // Some code
        return message
    }
    
    func alias(message: AliasMessage) -> AliasMessage? {
        // Some code
        return message
    }
    
    func flush() {
        // Some code
    }
    
    func reset() {
        // Some code
    }
}

2. Then, create a CustomDestination class file by extending RudderDestination and initialize RSCustomDestination inside init(), as shown:

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@objc
class CustomDestination: RudderDestination {
    override init() {
        super.init()
        plugin = RSCustomDestination()
    }
}

3. For Objective-C projects, a dialog box will appear while creating the Swift file - asking you to create a bridging header if it does not exist already. In this case, choose Create Bridging Header. This creates a <PROJECT_MODULE_NAME>-Bridging-Header.h file.

4. After creating the Bridging Header, search Objective-C Generated Interface Header Name in Build Settings and keep the header name handy. This should be something like <PROJECT_MODULE_NAME>-Swift.h.

5. Finally, add the CustomDestination with the RudderStack iOS SDK after its initialization, as shown:

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RSClient.sharedInstance().addDestination(CustomDestination())

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#import "<PROJECT_MODULE_NAME>-Swift.h"

[[RSClient sharedInstance] addDestination:[[CustomDestination alloc] init]];

FAQ

I'm facing issues building with Carthage on XCode 12. What should I do?

If you're facing an issue with Carthage and XCode 12, you can follow this workaround suggested by the Carthage team.

Does the iOS SDK support the tvOS, macOS, and watchOS platforms?

Yes, the iOS SDK supports tvOS and watchOS platforms. Refer to the table below for the version details:

How do I migrate from an older SDK version (v1.x) to the current version?

To migrate from the older SDK versions, update the usage of the following classes:

How can I get the user traits after making the identify call?

You can get the user traits after making an identify call in the following way:

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let traits = RSClient.sharedInstance().traits

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NSDictionary *traits = [RSClient sharedInstance].traits;
// or
NSDictionary *traits = [[RSClient sharedInstance] traits];

How does the SDK handle different client/server errors?

In case of client-side errors, for example, if the source write key passed to the SDK is incorrect, RudderStack gives a 400 Bad Request response and aborts the operation immediately. For other types of network errors, for example, invalid data plane URL, the SDK tries to flush the events to RudderStack in an incremental manner (every 1 second, 2 seconds, 3 seconds, and so on).

Why is there a difference between timestamp and received_at for iOS events vs. Android events sent at the same time?

This scenario is most likely caused by the default behavior of iOS apps staying open in the background for a short period of time after a user closes them.

When a user closes an iOS or Android app, the events will still continue to be sent from the queue until the app closes in the background. Any events still in the queue will be retained until the user reopens the app. Due to this lag, there are some scenarios where there can be significant differences between timestamp (when the event was created) and received_at (when RudderStack actually receives the event).

For Android apps, events can be sent from the background after apps close for a longer period of time than iOS apps, therefore, more of the events coming from the Android SDK have closer timestamp and received_at times.

Does RudderStack integrate with SKAdNetwork?

RudderStack does not integrate with SKAdNetwork. However, SKAdNetwork can be directly integrated into an iOS application alongside RudderStack.

Can I disable event tracking until the user gives their consent?

Yes, you can. Refer to the Enabling/disabling user tracking via the setOptOutStatus API section for more information.