@interface _VFBlockObserver : VFObserver { id /* block */ _resultBlock; id /* block */ _completionBlock; id /* block */ _failureBlock; } - (void)observerDidFailWithError:(id)a0; - (void)observerDidComplete; - (void)observerDidReceiveResult:(id)a0; - (void).cxx_destruct; - (id)initWithResultBlock:(id /* block */)a0 completionBlock:(id /* block */)a1 failureBlock:(id /* block */)a2; @end