iOS Registering device for Push Notifications


Example

To register your device for push notifications, add the following code to your AppDelegate file in didFinishLaunchingWithOptions method:

Swift

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    // Override point for customization after application launch.
    if UIDevice.currentDevice().systemVersion.compare(v, options: .NumericSearch) == NSOrderedAscending { 
        // Register for Push Notitications, if running iOS < 8
        if application.respondsToSelector("registerUserNotificationSettings:") {
            let types:UIUserNotificationType = (.Alert | .Badge | .Sound)
            let settings:UIUserNotificationSettings = UIUserNotificationSettings(forTypes: types, categories: nil)

            application.registerUserNotificationSettings(settings)
            application.registerForRemoteNotifications()
        } else {      
            // Register for Push Notifications before iOS 8
            application.registerForRemoteNotificationTypes(.Alert | .Badge | .Sound)
        }
    } else {
        var center = UNUserNotificationCenter.currentNotificationCenter()
        center.delegate = self
        center.requestAuthorizationWithOptions((UNAuthorizationOptionSound | UNAuthorizationOptionAlert | UNAuthorizationOptionBadge)) {(granted: Bool, error: NSError) -> Void in
            if !error {
                UIApplication.sharedApplication().registerForRemoteNotifications()
                // required to get the app to do anything at all about push notifications
                print("Push registration success.")
            } else {
                print("Push registration FAILED")
                print("ERROR: \(error.localizedFailureReason!) - \(error.localizedDescription)")
                print("SUGGESTIONS: \(error.localizedRecoveryOptions) - \(error.localizedRecoverySuggestion!)")
            })
    }

    return true
}

Objective-C

#define SYSTEM_VERSION_LESS_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)

if( SYSTEM_VERSION_LESS_THAN( @"10.0" ) )
{
        if ([application respondsToSelector:@selector(isRegisteredForRemoteNotifications)])
    {
        // iOS 8 Notifications
        [application registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeSound | UIUserNotificationTypeAlert | UIUserNotificationTypeBadge) categories:nil]];
        
        [application registerForRemoteNotifications];
    }
    else
    {
        // iOS < 8 Notifications
        [application registerForRemoteNotificationTypes:
         (UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeSound)];
    }

}
else
{
    UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
    center.delegate = self;
    [center requestAuthorizationWithOptions:(UNAuthorizationOptionSound | UNAuthorizationOptionAlert | UNAuthorizationOptionBadge) completionHandler:^(BOOL granted, NSError * _Nullable error)
     {
         if( !error )
         {
             [[UIApplication sharedApplication] registerForRemoteNotifications];  // required to get the app to do anything at all about push notifications
             NSLog( @"Push registration success." );
         }
         else
         {
             NSLog( @"Push registration FAILED" );
             NSLog( @"ERROR: %@ - %@", error.localizedFailureReason, error.localizedDescription );
             NSLog( @"SUGGESTIONS: %@ - %@", error.localizedRecoveryOptions, error.localizedRecoverySuggestion );  
         }  
     }];  
}


//to check if your App lunch from Push notification 
//---------------------------------------------------
    //Handel Push notification
    if (launchOptions != nil)
    {
        // Here app will open from pushnotification
        //RemoteNotification
        NSDictionary* dictionary1 = [launchOptions objectForKey:UIApplicationLaunchOptionsRemoteNotificationKey];
        //LocalNotification
        NSDictionary* dictionary2 = [launchOptions objectForKey:UIApplicationLaunchOptionsLocalNotificationKey];
        if (dictionary1 != nil)
        {
            //RemoteNotification Payload
            NSLog(@"Launched from push notification: %@", dictionary1);
            //here handle your push notification
        }
        if (dictionary2 != nil)
        {
            NSLog(@"Launched from dictionary2dictionary2dictionary2 notification: %@", dictionary2);
            double delayInSeconds = 7;
            dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
            dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
                // [self addMessageFromRemoteNotification:dictionary2 updateUI:NO];
            });
        }
        
     }
     else
         {}
    //------------------------------------------------

The above code will try to communicate with APNs server to get device token (prerequiesites are you have APNs enabled in your iOS provisioning profile).

Once it establishes reliable connection with APNs server, the server provides you a device token.

After adding the code above, add these methods to the AppDelegate class:

Swift

func application(application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData) {
    print("DEVICE TOKEN = \(deviceToken)")
}

func application(application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: NSError) {
    print(error)
}

Objective-C

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
{    
NSString * deviceTokenString = [[[[deviceToken description]
                     stringByReplacingOccurrencesOfString: @"<" withString: @""] 
                    stringByReplacingOccurrencesOfString: @">" withString: @""] 
                   stringByReplacingOccurrencesOfString: @" " withString: @""];

NSLog(@"The generated device token string is : %@",deviceTokenString);
}

- (void)application:(UIApplication*)application didFailToRegisterForRemoteNotificationsWithError:(NSError*)error
{
    NSLog(@"Failed to get token, error: %@", error.description);
}

The above methods are called according to registration success or failure scenario.

Success scenario calls:

Swift

func application(application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData) {
    print("DEVICE TOKEN = \(deviceToken)")
}

In Swift3:

@objc(userNotificationCenter:willPresentNotification:withCompletionHandler:) @available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void)
{
    //To show notifications in foreground.
   print("Userinfo2 \(notification.request.content.userInfo)")
}

Objective-C

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
{
if(application.applicationState == UIApplicationStateInactive) { 
    NSLog(@"Inactive - the user has tapped in the notification when app was closed or in background");
    //do some tasks
    [self handelPushNotification:userInfo];
}
else if (application.applicationState == UIApplicationStateBackground) {
    NSLog(@"application Background - notification has arrived when app was in background");
    [self handelPushNotification:userInfo];
}
else {
    NSLog(@"application Active - notication has arrived while app was opened");
    //Show an in-app banner
    //do tasks
}
}

Failure scenario calls:

Swift

func application(application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: NSError) {
    print(error)
}

Objective-C

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

Note

If none of the above methods are getting called, your device is not able to create reliable connection with APNs server, which might be because of internet access problems.