@class NSString, AVWeakReference, NSObject, AVCallbackContextRegistry; @protocol AVWeakObservable; @interface AVWeaklyObservedObjectClientBlockKVONotifier : NSObject <AVKVONotifier> { AVCallbackContextRegistry *_callbackContextRegistry; void *_callbackContextToken; NSObject *_observer; AVWeakReference *_weakReferenceToObject; NSObject<AVWeakObservable> *_unsafeUnretainedObject; NSString *_keyPath; unsigned long long _options; id /* block */ _block; } @property (readonly) unsigned long long hash; @property (readonly) Class superclass; @property (readonly, copy) NSString *description; @property (readonly, copy) NSString *debugDescription; - (void)cancelCallbacks; - (void)dealloc; - (void)start; - (void)callbackDidFireWithChangeDictionary:(id)a0; - (id)initWithCallbackContextRegistry:(id)a0 observer:(id)a1 object:(id)a2 keyPath:(id)a3 options:(unsigned long long)a4 block:(id /* block */)a5; @end