Question

我正在尝试检测AVPlayerViewController何时处于全屏模式，但我很难实现这一目标。我想知道用户何时选择展开按钮进入全屏，如下所示：

我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

适当的代码：

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
            }
        }
    }
}

然而，它似乎永远不会到达代码print("Full Screen")。无论播放器处于正常模式还是全屏模式，它都会print("Normal Screen")。

谢谢！

Answer 1

更新了Swift 3 ：

为playerViewController对象添加观察者：

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")
                }
            }
        }
    }
}

Answer 2

您的代码帮助我处理全屏和背景之间的切换。

但是对于识别部分，我只是稍微改变了我的要求。

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")
   }
}

希望这有帮助。

Answer 3

在iOS11中，如果AVPlayer全屏显示，屏幕的安全区域将降至0。虽然它可能是一个未记录的功能（因此可能存在bug）。我很难找到更多信息。

::shadow

Answer 4

这是@Pangu答案的经过稍微优化的Swift 4.2版本。它仅检测到更改，否则在与视频进行交互（如快速转发）时也会调用观察者。我还用AVPlayerViewController.videoBounds键路径替换了“ videoBounds”以避免字符串，并使用窗口边界确定其是否为全屏显示。

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")
                }
            }
        }
    }
}

Answer 5

从iOS 12开始，我们可以使用以下AVPlayerViewControllerDelegate委托方法：

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

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

5 个答案: