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

User · Answer

When you have repeated notifications at future, you do not want to cancel those notifications, you can clear the item in notification center by:

func clearNotificationCenter() {
    UIApplication.sharedApplication().applicationIconBadgeNumber = 1
    UIApplication.sharedApplication().applicationIconBadgeNumber = 0
}

You cannot clear notification when your app is open in the foreground by calling the method below immediately after receiving local notification, otherwise you will receive tens of hundreds of notifications. Maybe because the same notification apply again, and now is the time to fire, so you keep fire, apply again, fire, apply....:

[UIApplication sharedApplication].scheduledLocalNotifications = [UIApplication sharedApplication].scheduledLocalNotifications;

User · Answer

When you logout from your app  at that time you have to use a below line of code on your logout button click method     UIApplication sharedApplication  setApplicationIconBadgeNumber  0      UIApplication sharedApplication  cancelAllLocalNotifications     and this works perfectly in my app

User · Answer

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

User · Answer

In Swift I m using the following code inside my AppDelegate   func applicationDidBecomeActive application  UIApplication        application applicationIconBadgeNumber   0     application cancelAllLocalNotifications

User · Answer

You need to add below code in your AppDelegate applicationDidBecomeActive method      UIApplication sharedApplication  setApplicationIconBadgeNumber  0

User · Answer

It might also make sense to add a call to clearNotifications in applicationDidBecomeActive so that in case the application is in the background and comes back it will also clear the notifications    -  void applicationDidBecomeActive  UIApplication   application        self clearNotifications

User · Answer

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

User · Answer

If you have pending scheduled local notifications and don t want to use cancelAllLocalNotifications to clear old ones in Notification Center  you can also do the following    UIApplication sharedApplication  scheduledLocalNotifications    UIApplication sharedApplication  scheduledLocalNotifications    It appears that if you set the scheduledLocalNotifications it clears the old ones in Notification Center  and by setting it to itself  you retain the pending local notifications

User · Answer

Maybe in case there are scheduled alarms and uncleared app icon badges   NSArray  scheduledLocalNotifications    application scheduledLocalNotifications   NSInteger applicationIconBadgeNumber    application applicationIconBadgeNumber     application cancelAllLocalNotifications    application setApplicationIconBadgeNumber 0    for  UILocalNotification  scheduledLocalNotification in scheduledLocalNotifications         application scheduleLocalNotification scheduledLocalNotification      application setApplicationIconBadgeNumber applicationIconBadgeNumber

User · Answer

If you re coming here wondering the opposite  as I was   this post may be for you   I couldn t figure out why my notifications were clearing when I cleared the badge   I manually increment the badge and then want to clear it when the user enters the app  That s no reason to clear out the notification center  though  they may still want to see or act on those notifications   Negative 1 does the trick  luckily    UIApplication sharedApplication  applicationIconBadgeNumber   -1

User · Answer

Update for iOS 10  Swift 3   In order to clear all local notifications in iOS 10 apps  you should use the following code   import UserNotifications       if  available iOS 10 0           let center   UNUserNotificationCenter current       center removeAllPendingNotificationRequests      To remove all pending notifications which are not delivered yet but scheduled      center removeAllDeliveredNotifications      To remove all delivered notifications   else       UIApplication shared cancelAllLocalNotifications       This code handles the clearing of local notifications for iOS 10 x and all preceding versions of iOS  You will need to import UserNotifications for the iOS 10 x code

User · Answer

Got it from here  It works for iOS 9  UIApplication  app    UIApplication sharedApplication   NSArray  eventArray    app scheduledLocalNotifications   for  int i 0  i lt  eventArray count   i          UILocalNotification  oneEvent    eventArray objectAtIndex i         Cancelling local notification      app cancelLocalNotification oneEvent

[objective-c] iOS application: how to clear notifications?

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