如何在 Swift 中使用 AVPlayerViewController 检测全屏模式？

Posted 2023-02-23

【中文标题】如何在 Swift 中使用 AVPlayerViewController 检测全屏模式？

【英文标题】：How to detect fullscreen mode using AVPlayerViewController in Swift?

【发布时间】：2016-05-09 02:39:36

【问题描述】：

我试图检测AVPlayerViewController 何时处于全屏模式，但我很难做到这一点。我想知道用户何时选择展开按钮进入全屏，如下所示：

我已根据这些建议添加了适当的观察者：

Detect Video playing full screen in Portrait or landscape How to detect fullscreen mode of AVPlayerViewController

相应的代码：

var avWidth:CGFloat = 375
var avHeight:CGFloat = 300

override func viewDidLoad()

    super.viewDidLoad()

    let path = NSBundle.mainBundle().pathForResource("cable pressback", ofType: "mp4")
    let url = NSURL.fileURLWithPath(path!)
    let player = AVPlayer(URL: url)

    playerViewController.player = player

    playerViewController.view.frame = CGRectMake(0, 100, self.view.frame.size.width, 300)

    playerViewController.view.translatesAutoresizingMaskIntoConstraints = true

    view.addSubview(playerViewController.view)

    self.addChildViewController(playerViewController)

    [playerViewController .addObserver(self, forKeyPath:"videoBounds" , options: NSKeyValueObservingOptions.New, context: nil)]



override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>)

    print("playerViewController.view.frame = \(playerViewController.view.frame)")

    if keyPath == "videoBounds"
    
        let rect = change!["new"]! as! NSValue

        if let newrect = rect.CGRectValue() as CGRect?
        
            if newrect.width > 0 || newrect.height > 0
            
                if avWidth > 0 || avHeight > 0
                
                    if newrect.width > avWidth || newrect.height > avHeight
                    
                        print("Full Screen")
                    
                    else if newrect.width < avWidth || newrect.height < avHeight
                    
                        print("Normal screen")
                    
                
                avWidth = newrect.width
                avHeight = newrect.height
            
        
    

但是，它似乎永远无法到达代码 print("Full Screen")。无论播放器处于正常模式还是全屏模式，它都会触发print("Normal Screen")。

谢谢！

【问题讨论】：

您好，我也遇到了同样的问题，您已经解决了吗？谢谢

【参考方案1】：

从 ios 12 开始，我们可以使用这些 AVPlayerViewControllerDelegate 委托方法：

func playerViewController(AVPlayerViewController, willBeginFullScreenPresentationWithAnimationCoordinator: UIViewControllerTransitionCoordinator)
func playerViewController(AVPlayerViewController, willEndFullScreenPresentationWithAnimationCoordinator: UIViewControllerTransitionCoordinator)

【参考方案2】：

为 Swift 3 更新：

为playerViewController 对象添加一个观察者：

playerViewController(self, forKeyPath: "videoBounds", options: NSKeyValueObservingOptions.new, context: nil)

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?)

    if keyPath == "videoBounds"
    
        if let rect = change?[.newKey] as? NSValue
        
            if let newrect = rect.cgRectValue as CGRect?
            
                // 200 is height of playerViewController in normal screen mode
                if newrect.size.height <= 200
                
                    print("normal screen")
                
                else
                
                    print("full screen")
                
            
        
    

【参考方案3】：

您的代码帮助我处理全屏和返回之间的切换。

但是对于标识部分，我只是根据我的要求稍微改变了它。

let rect = change!["new"] as! NSValue

if let playerRect: CGRect = rect.CGRectValue() as CGRect          
   if playerRect.size == UIScreen.mainScreen().bounds.size 
      print("Video in full screen")
    else 
      print("Video not in full screen")
   

希望这会有所帮助。

【讨论】：

但全屏尺寸与 UIScreen.mainScreen().bounds.size 不匹配

【参考方案4】：

在 iOS11 中，如果 AVPlayer 进入全屏状态，您屏幕的安全区域将降至 0。尽管它可能是一个未记录的功能（因此是潜在的错误）。我很难找到有关它的更多信息。

[UIApplication sharedApplication].keyWindow.safeAreaLayoutGuide.layoutFrame.size.height == 0?

【参考方案5】：

这是@Pangu 答案的略微优化的 Swift 4.2 版本。它只检测变化，否则在与视频交互时也会调用观察者，例如快进。我还将“videoBounds”替换为AVPlayerViewController.videoBounds 键路径以避免字符串并使用窗口边界来确定它是否是全屏的。

avPlayerViewController.addObserver(self, forKeyPath: #keyPath(AVPlayerViewController.videoBounds), options: [.old, .new], context: nil)

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey: Any]?, context: UnsafeMutableRawPointer?) 
    if keyPath == #keyPath(AVPlayerViewController.videoBounds) 
        // detect only changes
        if let oldValue = change?[.oldKey] as? CGRect, oldValue != CGRect.zero, let newValue = change?[.newKey] as? CGRect 
            // no need to track the initial bounds change, and only changes
            if !oldValue.equalTo(CGRect.zero), !oldValue.equalTo(newValue) 
                if newValue.size.height < UIScreen.main.bounds.height 
                   print("normal screen")
                 else 
                   print("fullscreen")