Are there constants for iOS notifications in MonoTouch? And how to get a “local” observer?
Yes, there are constants. You can find them as static properties on the class that the notification refers to. For instance, to receive a notification when the app moves to the background, you could do something like this: NSObject enterBackgroundObserver; //... enterBackgroundObserver = NSNotificationCenter.DefaultCenter.
AddObserver (UIApplication. DidEnterBackgroundNotification, delegate(NSNotification ntf) { Console. WriteLine ("Entered background!"); }) Don't forget to remove the observer when you no longer need it: NSNotificationCenter.DefaultCenter.
RemoveObserver (enterBackgroundObserver).
Yes, there are constants. You can find them as static properties on the class that the notification refers to. For instance, to receive a notification when the app moves to the background, you could do something like this: NSObject enterBackgroundObserver; //... enterBackgroundObserver = NSNotificationCenter.DefaultCenter.
AddObserver (UIApplication. DidEnterBackgroundNotification, delegate(NSNotification ntf) { Console. WriteLine ("Entered background!"); }); Don't forget to remove the observer when you no longer need it: NSNotificationCenter.DefaultCenter.
RemoveObserver (enterBackgroundObserver).
Sure is. I believe this is what you want. UIApplicationState.
Active As in public override void ReceivedRemoteNotification(UIApplication application, NSDictionary userInfo) { if(application. ApplicationState == UIApplicationState. Active) { // this means your app is currently in the foreground } else { // this means a notification came in when your app was in the background.
} }.
UIViewController does not provide ReceivedRemoteNotification(). – Krumelur Apr 29 at 7:43 This would be in your Main.Cs, AppDelegate class. UIViewController is not responsible for handling notifications directly.
– Andrew Young Apr 29 at 17:00 this method is for receiving remote notifications.It will not be called when the application moves from/to foreground/background. Your code only checks if the app is in the background or foreground when a remote notification is received. – Dimitris Tavlikos May 5 at 6:53.
Im currently trying to figure out which notification string is sent if the app gets pushed to background. If there are no constants: where can I find the valid strings? Which one do I need for my "pushed to background" notification?
The other thing: is there a way to make a specific controller observer a notification? In my example I want to get rid of the popover controller a controller is currently showing. So I would like that MY controller observers the notifcation instead of having the global approach as shown above.
The problem is: if I do it like above in my view controller, remove the view controller and show a different one, the removed one still gets the notification. This means I don't get rid of the reference to that controller.
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