iphone - remoteControlReceivedWithEvent 从未调用过

Question

我正在尝试允许 Remote 或耳塞在应用处于后台或屏幕锁定时播放和暂停音频。所以在 viewDidLoad 中我有:

[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self becomeFirstResponder];

然后我有:

- (void) remoteControlReceivedWithEvent: (UIEvent *) receivedEvent {



if (receivedEvent.type == UIEventTypeRemoteControl) {



switch (receivedEvent.subtype) {



    case UIEventSubtypeRemoteControlTogglePlayPause:

        [self playOrStop];

        break;



    case UIEventSubtypeRemoteControlPreviousTrack:


        break;



    case UIEventSubtypeRemoteControlNextTrack:


        break;



    default:

        break;

}

}


}

但是，它永远不会被调用。在后台运行已打开，AVSession 在 AppDelegate 中设置。我很茫然。

Answer 1

您可能还需要添加:

- (BOOL)canBecomeFirstResponder {
    return YES;
}

UIResponder 的任何子类都需要实现这个，否则它不会接受第一响应者状态。