Before writing this post I made a lot of researches on UserNotification Framework, that substituted UILocalNotification in IOS 10. I also followed this tutorial to learn everything about this new feature : http://useyourloaf.com/blog/local-notifications-with-ios-10/.
Today I'm encountering so much troubles to implement such trivial Notifications and since it's a recent new feature I couldn't find any solutions (especially in objective C)! I currently have 2 different notifications, one Alert and one Badge updtate.
Before Updating my Phone from IOS 10.1 to 10.2, I made an alert on the Appdelegate that is triggered immediatly whenever the user closes the app manually:
-(void)applicationWillTerminate:(UIApplication *)application {
NSLog(@"applicationWillTerminate");
// Notification terminate
[self registerTerminateNotification];
}
// Notification Background terminate
-(void) registerTerminateNotification {
// the center
UNUserNotificationCenter * notifCenter = [UNUserNotificationCenter currentNotificationCenter];
// Content
UNMutableNotificationContent *content = [UNMutableNotificationContent new];
content.title = @"Stop";
content.body = @"Application closed";
content.sound = [UNNotificationSound defaultSound];
// Trigger
UNTimeIntervalNotificationTrigger *trigger = [UNTimeIntervalNotificationTrigger triggerWithTimeInterval:1 repeats:NO];
// Identifier
NSString *identifier = @"LocalNotificationTerminate";
// création de la requête
UNNotificationRequest *terminateRequest = [UNNotificationRequest requestWithIdentifier:identifier content:content trigger:trigger];
// Ajout de la requête au center
[notifCenter addNotificationRequest:terminateRequest withCompletionHandler:^(NSError * _Nullable error) {
if (error != nil) {
NSLog(@"Error %@: %@",identifier,error);
}
}];
}
Before IOS 10.2 it worked just fine, when I closed the app manually, an alert showed up. But since I updated to IOS 10.2, nothing shows up without any reason, I havent change anything, and I can't see what's missing..
I also tried (only in IOS 10.2 this time) to implement badging on my app icon which worked just fine, until I tried to remove it. Here is the function that does it :
+(void) incrementBadgeIcon {
// only increment if application is in background
if ([[UIApplication sharedApplication] applicationState] == UIApplicationStateBackground){
NSLog(@"increment badge");
// notif center
UNUserNotificationCenter *notifCenter = [UNUserNotificationCenter currentNotificationCenter];
// Content
UNMutableNotificationContent *content = [UNMutableNotificationContent new];
content.badge = [NSNumber numberWithInt:1];
// Trigger
UNTimeIntervalNotificationTrigger *trigger = [UNTimeIntervalNotificationTrigger triggerWithTimeInterval:1 repeats:NO];
// Identifier
NSString *identifier = @"LocalNotificationIncrementBadge";
// request
UNNotificationRequest *incrementBadgeRequest = [UNNotificationRequest requestWithIdentifier:identifier content:content trigger:trigger];
// Ajout de la requête au center
[notifCenter addNotificationRequest:incrementBadgeRequest withCompletionHandler:^(NSError * _Nullable error) {
if (error != nil) {
NSLog(@"Error %@: %@",identifier,error);
}
}];
}
}
For now it does not increment the badge number, as it's name should suggest, but it just set the badge number to 1. Documentation says that if you set content.badge to 0, it removes it, but this does not work. I tried with other numbers, when I manually change it to '2', '3', etc... it changes, but if I set it to 0, it does not work.
Also, in the tutorial I linked earlier, it is mentionned several functions as getPendingNotificationRequests:completionHandler: and getDeliveredNotificationRequests:completionHandler:. I noticed that, when I call these functions right after calling incrementBadgeIcon, if the content.badge is set to '1', '2' etc... it appears in the pending notifications list. However, when I set it to 0, it does not appear anywhere. I get no error, no warning in Xcode, and my application badge still remain.
Does anyone know how I can fix these two Alerts?
Thank in advance
PS: I also tried to use removeAllPendingNotificationRequests and removeAllDeliveredNotifications for both without success.
Well then I finally managed to make these two alerts functionning. As if posting this question on stackoverflow helped me to open my mind on that subject that hold me for the last few days (also these are really simple answers which is pretty shameful).
Here are my solutions if somebody come accross this post.
For the alert that should show up when the app is closes, for instance when the app is killed by the user when in background, the code snippet is 'correct' overall. The point is that, when the appDelegate trigger the applicationWillTerminate: function, the system has already started to dealloc/dismantle the whole memory of your application. Therefore, if your app has many views loaded, and many datas to free, the thread that add the notification to the center has enough time to do it's task. But if the application has only few memory to dispose of, the notification is never added to the notifications center's queue.
- (void)applicationWillTerminate:(UIApplication *)application {
NSLog(@"applicationWillTerminate");
// Notification terminate
[Utils closePollenNotification];
// Pause the termination thread
[NSThread sleepForTimeInterval:0.1f];
}
So in my case I added a simple sleep in applicationWillTerminate right after creating the notification, which give enough time for it to be registered. (Note: I don't know if this is a good practice but it worked for me).
Obviously, after a better understanding of the Apple documentation, setting content.badge to 0 does not remove the previous badge set. It just tells the notification not to update the badge. To remove it, I simply had to call sharedApplication function :
//Reset badge icon
+(void) resetBadgeIcon {
NSLog(@"reset badge");
// remove basge
[UIApplication sharedApplication].applicationIconBadgeNumber = 0;
}
So simple.
Hope this can help somebody.