Is there a way for me to respond to an APNS push notification by executing a task specified in the payload?

As a newcomer to objective-c, xcode, and app development, I kindly ask for your patience.

I have managed to send a push notification via APNS to my new app. I can view the JSON message and log it using NSSLog.

Payload: {
    aps = {
        alert = {
            "action-loc-key" = Reveal;
            body = "Hi Aleem, we have a new special offer just for you!";
        };
        badge = 70;
        sound = default;
    };

    myCMD = {
        "update_colour" = red;
    };
}

Everything seems to be working well so far. However, I am struggling to take action based on the received push message. For instance, I would like to extract the update_colour value (red in this case) and change the background color of a label in my controller to red.

The issue lies in my inability to reference the label from my appdelegate.m file. Consequently, I cannot update the background color or call a method on the controller to do so either.

Any assistance with this matter would be greatly valued.

javascriptiosxcodejsonapple-push-notifications

Answer №1

To implement handling push notifications in your app, make sure to include the following code in your delegate:

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo;

When a push notification is received while the app is active or when a user interacts with a push notification, you can access the payload of the notification and perform actions based on it. You can then send a notification to your view controller.

In your view controller, add an Observer:

[[NSNotificationCenter defaultCenter] addObserver:self
                                     selector:@selector(backgroundChanged:)
                                         name:@"ChangeBackground"
                                       object:nil];

Add the method to handle the notification:

- (void)backgroundChanged:(NSNotification *)notification {
    NSDictionary *dict = [notification userInfo];

    NSLog(@"%@", [[dict valueForKey:@"myCMD"] valueForKey:@"background-colour"]);

    label.backgroundColor = [UIColor xxx];
}

Then, in your delegate, implement the method for receiving remote notifications:

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {
    if([userInfo valueForKey:@"myCMD"]) {
        NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
        [notificationCenter postNotificationName:@"ChangeBackground"
                                    object:nil
                                    userInfo:userInfo];
    }
}

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