Continuous app extension update

I've created a notification center app extension that works really great except that I can't keep it up to date UILabel

. The reason I need to do this is because my application is constantly changing the dataset that I want to show in the extension.

I tried using NSUserDefaultsDidChangeNotification

to update data in an extension, but it doesn't work. Here is my code:

Registration for change notification (extension)

- (void)viewDidLoad
    [super viewDidLoad];


    [[NSNotificationCenter defaultCenter] addObserver:self

- (void)userDefaultsDidChange:(NSNotification *)notification
    NSUserDefaults *defaults = [[NSUserDefaults alloc] initWithSuiteName:@""];
    //update label


Sending data to the extension

- (void)updateData
    NSUserDefaults *sharedDefaults = [[NSUserDefaults alloc] initWithSuiteName:@""];
    [sharedDefaults setInteger:seconds forKey:@"seconds"];
    [sharedDefaults synchronize];


I have application groups configured correctly in both the main application and the extension, both referring to the same group.

Does anyone know why this is not working, or if there is another way to do it? Many thanks!


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1 answer

I ran into the same issue in WatchKit app and NSUserDefaultsDidChangeNotification

really doesn't start in extension for generic NSUserDefaults


The best solution I've found is a library called MMWormhole that uses CFNotificationCenter Darwin Notifications

to achieve this.



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