iOS - Push notification alert is not shown when th

问题:

I've integrated push notifications in my app. Users will receive push notification to join a group. When the user clicks Join, I've to handle something in the code. And so I'm implementing:

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

This is working fine when the app is not running.
When the app is running, I don't see any UIAlertView. How can make my app show the push notification alert so that user can still decide whether to join or not?

回答1:

I used code like this in my application delegate to mimic the notification alert when the app was active. You should implement the appropriate UIAlertViewDelegate protocol method(s) to handle what happen when the user taps either of the buttons.

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {    
  UIApplicationState state = [application applicationState];
  if (state == UIApplicationStateActive) {
      NSString *cancelTitle = @"Close";
      NSString *showTitle = @"Show";
      NSString *message = [[userInfo valueForKey:@"aps"] valueForKey:@"alert"];
      UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Some title"
       message:message 
       delegate:self 
       cancelButtonTitle:cancelTitle 
       otherButtonTitles:showTitle, nil];
      [alertView show];
      [alertView release];
  } else {
    //Do stuff that you would do if the application was not active
  }
}

回答2:

For anyone might be interested, I ended up creating a custom view that looks like the system push banner on the top but adds a close button (small blue X) and an option to tap the message for custom action. It also supports the case of more than one notification arrived before the user had time to read/dismiss the old ones (With no limit to how many can pile up...)

Link to GitHub: AGPushNote

The usage is basically on-liner:

[AGPushNoteView showWithNotificationMessage:@"John Doe sent you a message!"];

And it looks like this on iOS7 (iOS6 have an iOS6 look and feel...)

回答3:

You have to show the alert yourself if you want to. This is intentional behavior as documented here http://developer.apple.com/library/ios/#documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/IPhoneOSClientImp/IPhoneOSClientImp.html below Listing 2-6

回答4:

only this function will be invoked and you have to explicitly show the alert on that case no notification will come if app is running in which you have implement the notification.Put the break point there and handle the notification call when function called and show your customized alert there.

回答5:

For showing alert view while running application you have to use

-(void)application:(UIApplication *)application 
       didReceiveRemoteNotification:(NSDictionary *)userInfo {
}

and by accessing the userInfo variable

回答6:

The app will still receive the -application:didReceiveRemoteNotification message in your App Delegate, but you'll have to act on the message yourself (i.e. the alert isn't displayed by default).

The userInfo parameter contains an object with the key notificationType, which you can use to identify the push message.

回答7:

Here is a version which support UIAlertController

-(void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification {
UIApplicationState state = [application applicationState];
[UIApplication sharedApplication].applicationIconBadgeNumber = 0;
if (state == UIApplicationStateActive) {

    UIAlertController * alert=   [UIAlertController
                                  alertControllerWithTitle:notification.alertTitle
                                  message:notification.alertBody
                                  preferredStyle:UIAlertControllerStyleAlert];

    UIAlertAction* ok = [UIAlertAction
                         actionWithTitle:@"OK"
                         style:UIAlertActionStyleDefault
                         handler:^(UIAlertAction * action)
                         {
                             [alert dismissViewControllerAnimated:YES completion:nil];

                         }];

    [alert addAction:ok];

    [self.navigationController presentViewController:alert animated:YES completion:nil];

}

}

** Please note my app uses self.navigationController in App Delegate, just hook on to any ViewController to present ( show ) the Alert **