[转]iPhone 多媒体遥控（iPhone Remote Control of Multimedia）后台音乐播放

原地址：http://geagle001.blog.163.com/blog/static/188226090201173110404762/

用户要实现后台的播放的控制，需要按下面的方法来实现。这样实现的效果就是和iPod后台播放的效果一样。在后台播放音乐的时候可以通过任务栏来控制。任务栏通过双击Home键来调出，调出后向左滑到最前门可以看到这个控制按钮。如下图：

 

 

 

 1.在View显示的时候接收remote-control事件

- (void)viewDidAppear:(BOOL)animated {

    [super viewDidAppear:animated];

    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

    [self becomeFirstResponder];

}

2.在View消失或者我们不需要响应控制的时候取消接收remote-control 事件

- (void)viewWillDisappear:(BOOL)animated {

    [[UIApplication sharedApplication] endReceivingRemoteControlEvents];

    [self resignFirstResponder];

    [super viewWillDisappear:animated];

}

                             

3 重新下面的函数

- (BOOL) canBecomeFirstResponder  {

    return YES;  

}

 

4 接收遥控事件

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

    if (receivedEvent.type == UIEventTypeRemoteControl) {

        switch (receivedEvent.subtype) {

            case UIEventSubtypeRemoteControlTogglePlayPause:

                [self playOrStop: nil];

                break;

            case UIEventSubtypeRemoteControlPreviousTrack:

                [self previousTrack: nil];

                break;

            case UIEventSubtypeRemoteControlNextTrack:

                [self nextTrack: nil];

                break;

            default:

                break;

        }

    }

}