如何在Swift中使用AVPlayerViewController检测全屏模式？ [英] How to detect fullscreen mode using AVPlayerViewController in Swift?

问题描述

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：

I am trying to detect when the AVPlayerViewController is in full-screen mode, but I'm having a difficult time achieving this. I'd like to know when the user selects the expand button to enter full screen as shown here:

我根据这些建议添加了适当的观察者：

I've added the appropriate observer per these suggestions:

1. 以纵向或横向视频全屏检测视频


2. 如何检测AVPlayerViewController的全屏模式

1. Detect Video playing full screen in Portrait or landscape
2. 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
            }
        }
    }
}

然而，它似乎永远不会到达代码 print（全屏）。无论播放器处于正常模式还是全屏模式，它都会打打印（正常屏幕）。

However, it never seems to reach the code print("Full Screen"). It's hitting print("Normal Screen") regardless of whether the player is in normal or full screen mode.

谢谢！

推荐答案

针对Swift 3进行了更新：

添加 playerViewController 对象的观察者：

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")
                }
            }
        }
    }
}

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