相关疑难解决方法(0)

我在我的iPad应用程序中使用MPMoviePlayer实现了一个视频播放器,使用MPVolumeView进行音量控制.我的问题是,当我滚动音量视图调整音量时,显示设备的音量hud叠加,如下面的屏幕截图所示.

如何禁用此系统音量指示器hud？我的代码是:

@property (weak, nonatomic) IBOutlet MPVolumeView *playbackMPVolumeView;

//Customizing controller
- (void)customizeVolumeController
{
    _playbackMPVolumeView.showsRouteButton  = YES;
    _playbackMPVolumeView.showsVolumeSlider = YES;
    [_playbackMPVolumeView setVolumeThumbImage:[UIImage imageNamed:@"volume_slider_thumb.png"] forState:UIControlStateNormal];
}

未调用音量按钮通知功能.

码:

func listenVolumeButton(){
    // Option #1
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "volumeChanged:", name: "AVSystemController_SystemVolumeDidChangeNotification", object: nil)
    // Option #2
    var audioSession = AVAudioSession()
    audioSession.setActive(true, error: nil)
    audioSession.addObserver(self, forKeyPath: "volumeChanged", options: NSKeyValueObservingOptions.New, context: nil)
}

override func observeValueForKeyPath(keyPath: String, ofObject object: AnyObject, change: [NSObject : AnyObject], context: UnsafeMutablePointer<Void>) {
    if keyPath == "volumeChanged"{
        print("got in here")
    }
}

func volumeChanged(notification: NSNotification){
   print("got in here")
}

listenVolumeButton() 正在viewWillAppear中调用

"got in here"在任何一种情况下,代码都没有进入print语句.

我正在尝试两种不同的方法来实现它,两种方式都不起作用.

我跟着这个:检测iPhone音量按钮向上按？