PerformSelectorOnMainthRead iOS를 사용하여 호출로 캐스트 객체

Question

를 사용하면

[self performSelectorOnMainThread:@selector(uploadDidEnd:) withObject:foo
        waitUntilDone:YES]

.

방법 - (void) uploaddidend : (id) 송신자

보낸 사람인가?Foo 호출은 사용자 정의 클래스입니까?이 보낸 사람을 내 객체에서 어떻게 변환 할 수 있습니까?

나는 던지려고하지만, 나는 를 가지고있다.

'-[_NSThreadPerformInfo CountY]: unrecognized selector sent to instance 0x52bbd0'

.

알림에서는 보낸 사람에서 NSNotification까지 캐스트를 사용하고 알림은 객체 속성을 가지고 있지만 NSTHREAD에서는 찾지 못했습니다.

감사합니다.

Answer 1

You can think of:

[self performSelectorOnMainThread:@selector(uploadDidEnd:)
      withObject:foo
      waitUntilDone:YES]

as sort of the same as:

[self uploadDidEnd:foo];

Are you sure that's what you're trying to do?

If so: inside your uploadDidEnd: implementation, you can cast foo to whatever object type it really is like so:

- (void)uploadDidEnd:(id)sender
{
  FooClass *foo = (FooClass *)sender;
  [foo doSomething]; // or whatever
}

Answer 2

1. The argument declared a sender is the only parameter passed to your method. performSelectorOnMainThread:withObject:waitUntilDone: passes its argument after withObject to the selector to be performed, so yes, here foo will be passed to uploadDidEnd:

2. Casting is not a solution. Objective-C is a dynamic language, so even if casting eliminates compiler warnings, the actual implementation of the object wouldn't change, so it naturally would not repond to messages.