Ios becomeFirstResponder失败

我有一个简单的问题：

如何设置代码使NSObject成为第一响应者？在我的代码中，我将此代码放入AppDelegate，但该AppDelegate未能成为第一响应者。如果我试图让另一个NSObject成为第一响应者，我也会遇到同样的情况

//This function is called when app enters background
- (void)prepareRemoteControlEventsListener{

    //register for remote control
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

    // Set itself as the first responder
    BOOL success = [self becomeFirstResponder];
    if (success) {
        NSLog(@"APP degelgate AVManager for remote control events");
    }else{
        NSLog(@"@@@ degelgate failed to listen remote control events @@@");
    }
}
//Suppose it should enable self becoming firstResponder?
- (BOOL)canBecomeFirstResponder{
    return YES;
}

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让appdelegate作为第一响应者，您将实现什么？现在调用此应用程序内委托可能还为时过早，因为视图不在层次结构中是的您的appdelegate是UIResponder的子类？Emmanuel，appdelegate是每个应用程序的UIResponder，不是吗？rajesh，我试图通过调用beginReceivingRemoteControlEvents来接收远程控制事件