iOS application: how to clear notifications?

Question

I've an iOS application where some Push Notification are sent to. My problem is, that the messages/notifications stays in the Notification Center in iOS after then are tapped. How can I remove a notification for my application in the Notification Center next time the application opens?

I came across posts where people are calling setApplicationIconBadgeNumber to a zero-value to clear the notifications. That's seems very weird to me, so I believe that maybe another solution exists?

EDIT1:

I'm having some problems clearing the notifications. Please see my code here:

- (void) clearNotifications {     [[UIApplication sharedApplication] setApplicationIconBadgeNumber: 0];     [[UIApplication sharedApplication] cancelAllLocalNotifications]; }  - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {     if (launchOptions != nil)     {         NSDictionary* dictionary = [launchOptions objectForKey:UIApplicationLaunchOptionsRemoteNotificationKey];         if (dictionary != nil)         {             NSLog(@"Launched from push notification: %@", dictionary);              [self clearNotifications];         }     }      return YES; }  - (void)application:(UIApplication*)application didReceiveRemoteNotification:(NSDictionary*)userInfo {         NSLog(@"Received notification: %@", userInfo);     [self clearNotifications]; } 

I'm running the App through Xcode. When the App is minimized and I start the App using the notification in the Notification Center, I can see in the log, that the didReceiveRemoteNotification is called and using breakpoints I can see, that the clearNotifications has ran. But still the notification hangs in the Notification Center. Why?

Answer 1

Most likely because Notification Center is a relatively new feature, Apple didn't necessarily want to push a whole new paradigm for clearing notifications. So instead, they multi-purposed [[UIApplication sharedApplication] setApplicationIconBadgeNumber: 0]; to clear said notifications. It might seem a bit weird, and Apple might provide a more intuitive way to do this in the future, but for the time being it's the official way.

Myself, I use this snippet:

[[UIApplication sharedApplication] setApplicationIconBadgeNumber: 0]; [[UIApplication sharedApplication] cancelAllLocalNotifications]; 

which never fails to clear all of the app's notifications from Notification Center.

Answer 2

Just to expand on pcperini's answer. As he mentions you will need to add the following code to your application:didFinishLaunchingWithOptions: method;

[[UIApplication sharedApplication] setApplicationIconBadgeNumber: 0]; [[UIApplication sharedApplication] cancelAllLocalNotifications]; 

You Also need to increment then decrement the badge in your application:didReceiveRemoteNotification: method if you are trying to clear the message from the message centre so that when a user enters you app from pressing a notification the message centre will also clear, ie;

[[UIApplication sharedApplication] setApplicationIconBadgeNumber: 1]; [[UIApplication sharedApplication] setApplicationIconBadgeNumber: 0]; [[UIApplication sharedApplication] cancelAllLocalNotifications];