@class NSString; @interface _NAKeyValueObserverProxy : _NAObserverProxy { BOOL _isObserving; } @property (readonly, copy, nonatomic) id /* block */ observerBlock; @property (readonly, weak, nonatomic) id observedObject; @property (readonly, copy, nonatomic) NSString *keyPath; - (void)invalidate; - (void)observeValueForKeyPath:(id)a0 ofObject:(id)a1 change:(id)a2 context:(void *)a3; - (void).cxx_destruct; - (id)initWithWeakObserver:(id)a0 observedObject:(id)a1 keyPath:(id)a2 options:(unsigned long long)a3 observerBlock:(id /* block */)a4; @end