@interface _UIAsyncInvocation : NSObject { _Atomic void *_observer; id /* block */ _invocationBlock; _Atomic BOOL _invocationBlockHasBeenCalled; _Atomic long long _invokeCallCount; } + (id)emptyInvocation; + (id)invocationWithBlock:(id /* block */)a0; - (id)invoke; - (void)dealloc; - (void).cxx_destruct; @end