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| -rw-r--r-- | README.md | 44 |
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@@ -26,26 +26,40 @@ I hope, it is really easy: To set an example, I made a demo project: [MASShortcutDemo](https://github.com/shpakovski/MASShortcutDemo). Enjoy! #Notifications -By registering for NSNotifications from NSUserDefaults observing, you can get a callback whenever a user changes the shortcut, allowing you to perform any UI updates, or other code handling tasks. +By registering for KVO notifications from `NSUserDefaultsController`, you can get a callback whenever a user changes the shortcut, allowing you to perform any UI updates, or other code handling tasks. This is just as easy to implement: - //implement when loading view - NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; - [defaults addObserver:self - forKeyPath:kPreferenceGlobalShortcut - options:NSKeyValueObservingOptionNew - context:NULL]; - - //capture the KVO change and do something - - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context - { - NSLog(@"KVO changed"); +```objective-c +// Declare an ivar for key path in the user defaults controller +NSString *_observableKeyPath; + +// Make a global context reference +void *kGlobalShortcutContext = &kGlobalShortcutContext; + +// Implement when loading view +_observableKeyPath = [@"values." stringByAppendingString:kPreferenceGlobalShortcut]; +[[NSUserDefaultsController sharedUserDefaultsController] addObserver:self forKeyPath:_observableKeyPath + options:NSKeyValueObservingOptionInitial + context:kGlobalShortcutContext]; + +// Capture the KVO change and do something +- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)obj + change:(NSDictionary *)change context:(void *)ctx +{ + if (ctx == kGlobalShortcutContext) { + NSLog(@"Shortcut has changed"); + } + else { + [super observeValueForKeyPath:keyPath ofObject:obj change:change context:ctx]; } +} - //don't forget to remove the observer - NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; - [defaults removeObserver:self forKeyPath:kPreferenceGlobalShortcut]; +// Do not forget to remove the observer +[[NSUserDefaultsController sharedUserDefaultsController] removeObserver:self + forKeyPath:_observableKeyPath + context:kGlobalShortcutContext]; +``` # Non-ARC Version |