nsnotifications

Where should I remove the observer for NSNotification in Swift, since viewDidUnload and dealloc() are unavailable? Use below method which functions same as dealloc . deinit { // Release all resources // perform the deinitialization } A deinitializer is called immediately before a class instance is deallocated. You write deinitializers with the deinit keyword, similar to how intializers are written with the init keyword. Deinitializers are only available on class types. Swift Deinitializer As of iOS 9 (and OS X 10.11), you don't need to remove observers yourself, if you're not using block based

I'm confused on why the observer is never removed in the following code. In my viewDidAppear I have the following: -(void)viewDidAppear:(BOOL)animated{ id gpsObserver = [[NSNotificationCenter defaultCenter] addObserverForName:FI_NOTES[kNotificationsGPSUpdated] object:nil queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification *note){ NSLog(@"run once, and only once!"); [[NSNotificationCenter defaultCenter] removeObserver:gpsObserver]; }]; } The observer never gets removed and the statement is output every time the notification is sent out. Can anyone provide any guidance? When the block

In Objective-C, a custom notification is just a plain NSString, but it's not obvious in the WWDC version of Swift 3 just what it should be. You could also use a protocol for this protocol NotificationName { var name: Notification.Name { get } } extension RawRepresentable where RawValue == String, Self: NotificationName { var name: Notification.Name { get { return Notification.Name(self.rawValue) } } } And then define your notification names as an enum anywhere you want. For example: class MyClass { enum Notifications: String, NotificationName { case myNotification } } And use it like

Is there an easy-to-grock pattern how to send a NSNotification (Objective C) | Notification (in Swift) and how to receive one? Code snippet? The docs write like 150 pages on the topic. Would like to see a quick example. Send a notification: [[NSNotificationCenter defaultCenter] postNotificationName:@"MyCacheUpdatedNotification" object:self]; Receive it: [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(cacheUpdated:) name:@"MyCacheUpdatedNotification" object:nil]; Act on it: - (void)cacheUpdated:(NSNotification *)notification { [self load]; } And dispose of it: [

I have an observer of NSNotification which is called twice. I do not know what to do with it. I googled it but no solution found. [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(connectedToServer:) name:@"ConnectedToServer" object:nil]; - (void)connectedToServer:(NSNotification*)notification { [[NSNotificationCenter defaultCenter] postNotificationName:@"SendMessageToServer" object:message]; } Solution 1: The first thing is to check if the notification itself is posted twice. Solution 2: Even if the notification is posted only once, the action will be called as many