2013-05-01 70 views
4

使用MPVolumeView我想为应用程序的音频创建一个AirPlay输出按钮。MPVolumeView AirPlay按钮没有显示

MPVolumeView *volumeView = [ [MPVolumeView alloc] initWithFrame:CGRectMake(20, 20, 220, 20)]; 
    [volumeView setShowsVolumeSlider:NO]; 
    [volumeView setShowsRouteButton:YES]; 
    [volumeView sizeToFit]; 
    [self.view addSubview:volumeView]; 
    [volumeView release]; 

错误/问题没有,但它不显示,有什么想法?
谢谢!

+0

我刚刚使用你的代码,它工作正常。 airplay按钮显示出来,并且动作起作用......您是将此添加到tableView还是其他内容? – 2013-05-01 18:34:01

回答

3

代替init,发送它initWithFrame:(CGRect)消息。好像认为是存在的,它只是有(0,0,0,0)

这里框架的代码:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    // Override point for customization after application launch. 
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
    ViewController *vc = [[ViewController alloc] init]; 
    [vc.view setBackgroundColor:[UIColor redColor]]; 
    MPVolumeView *volumeView = [[MPVolumeView alloc] initWithFrame:CGRectMake(20, 20, 200, 50)]; 
    [volumeView setShowsVolumeSlider:YES]; 
    [volumeView setShowsRouteButton:YES]; 
    [volumeView sizeToFit]; 
    [vc.view addSubview:volumeView]; 
    UILabel *testLabel = [[UILabel alloc] initWithFrame:CGRectMake(50, 50, 200, 50)]; 
    testLabel.text = @"TESTING"; 
    [vc.view addSubview:testLabel]; 
    [self.window setRootViewController:vc]; 
    [self.window makeKeyAndVisible]; 
    [vc viewDidLoad]; 
    return YES; 
} 

对设备进行测试时,它的工作原理:

enter image description here

+0

谢谢,更新到initWithFrame:CGRectMake(20,20,220,20)但仍然:/ – 2013-05-01 18:11:37

+0

我假设self.view是对ViewController的主视图的引用?而且,因为编译时没有问题,你已经在头文件中添加了相应的import语句? – 2013-05-01 18:17:40

+0

是的,self.view与所有其他元素一起工作,没有问题,导入MediaPlayer/MediaPlayer.h。有任何想法吗? – 2013-05-01 18:21:44

6

这可能是您将您的VolumeView放在白色背景下。 Airplay路由按钮在使用之前是白色的(即:当它不通过AirPlay进行路由时),所以如果将控件放在白色背景下,则不会看到它,但会响应轻击。如上所示,将背景改为红色,并显示。

0

当有多条路线可用时,会显示Airplay路线按钮。

窍门我发现永久显示Airplay按钮是隐藏MPVolumeView路由按钮,删除用户MPVolumeView用户交互和目标与UIButton包装的路由按钮操作。

var airplayRouteButton: UIButton? 

private func airPlayButton() -> UIButton { 

    let wrapperView = UIButton(frame: CGRect(x: 0, y: 0, width: 44, height: 44)) 
    wrapperView.setImage(YOUR_AIRPLAY_IMAGE, for: UIControlState.normal) 
    wrapperView.backgroundColor = .clear 
    wrapperView.addTarget(self, action: #selector(PlayerView.replaceRouteButton), for: UIControlEvents.touchUpInside) 

    let volumeView = MPVolumeView(frame: wrapperView.bounds) 
    volumeView.showsVolumeSlider = false 
    volumeView.showsRouteButton = false 
    volumeView.isUserInteractionEnabled = false 

    self.airplayRouteButton = volumeView.subviews.filter { $0 is UIButton }.first as? UIButton 

    wrapperView.addSubview(volumeView) 

    return wrapperView 
} 

@objc private func replaceRouteButton() { 
    airplayRouteButton?.sendActions(for: .touchUpInside) 
}