在AVPlayerViewController上添加的UISlider contentOverlayView没有响应

Question

我正在尝试添加一个UISlider来控制AVPlayerViewController中的音量,为此我在'AVPlayerViewController.contentOverlayView'上添加了一个UISlider.UISlider不允许我拖动,好像没有启用它并且它的选择器操作方法'changeVolumeLevelOfPlayer'没有被调用.

这是我的代码:

-(void)viewDidLoad {

 [super viewDidLoad];

 [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];

 [[AVAudioSession sharedInstance] setActive:YES error:nil];

 [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

 AVPlayerViewController *avPlayerViewController = [[AVPlayerViewController alloc] init];

 AVPlayer *player = [AVPlayer playerWithURL:[self getVideoURLAtIndex:[self.indexOfCurrentTrailer intValue]]];

 avPlayerViewController.player = player;

 avPlayerViewController.delegate = self;

 [player play];

 avPlayerViewController.view.frame = CGRectMake(0, 0, 300, 250);

 UISlider *sliderForVolumeControl = [[UISlider alloc] initWithFrame:CGRectMake(0, avPlayerViewController.view.frame.size.height/2, 100, 40)];

 [sliderForVolumeControl setMinimumValue:0.0];

 [sliderForVolumeControl setMaximumValue:1.0];

 [sliderForVolumeControl setValue:0.5];

 sliderForVolumeControl.continuous = YES;

 [sliderForVolumeControl setBackgroundColor:[UIColor orangeColor]];

 [sliderForVolumeControl addTarget:self action:@selector(changeVolumeLevelOfPlayer:) forControlEvents:UIControlEventValueChanged];

 [sliderForVolumeControl setUserInteractionEnabled:YES];

 [sliderForVolumeControl setEnabled:YES];

 [avPlayerViewController.contentOverlayView addSubview:sliderForVolumeControl];

 [self addChildViewController:avPlayerViewController];

 [self.view addSubview:avPlayerViewController.view];

 [avPlayerViewController didMoveToParentViewController:self];

 [player addObserver:self forKeyPath:@"status" options:(NSKeyValueObservingOptionNew | NSKeyValueObservingOptionInitial) context:nil];

}

 -(void)changeVolumeLevelOfPlayer:(UISlider *)sender {

    player.volume = sender.value;

 }

Answer 1

来自苹果文档：

使用内容叠加视图在视频内容和控件之间添加其他自定义视图。

所以它看起来像这样：（在 UISlider 上有一堆其他层）

要使其工作，只需更改此行：

[avPlayerViewController.contentOverlayView addSubview:sliderForVolumeControl];

对此：

[avPlayerViewController.view addSubview:sliderForVolumeControl];