按下完成后停止 AV Player

Question

我将本地视频加载到新的视图控制器中，但点击完成后它消失并立即再次弹出。我不知道是否有办法跟踪通知或什么。

这是我的代码：

import UIKit
import AVKit
import AVFoundation

class VideoController1: UIViewController {

    var playerViewController = AVPlayerViewController()
    var playerView = AVPlayer()

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func viewDidAppear(_ animated: Bool) {
        let fileURL = NSURL(fileURLWithPath: "/Users/jamesjarrett/Desktop/NIMS/NIMS/NIMS/Vid2.mp4")
        playerView = AVPlayer(url: fileURL as URL)
        playerViewController.player = playerView
        self.present(playerViewController, animated: true){
            self.playerViewController.player?.play()
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

Answer 1

你把你的代码

let fileURL = NSURL(fileURLWithPath: "/Users/jamesjarrett/Desktop/NIMS/NIMS/NIMS/Vid2.mp4")
    playerView = AVPlayer(url: fileURL as URL)
    playerViewController.player = playerView
    self.present(playerViewController, animated: true){
        self.playerViewController.player?.play()
    }

ViewController 的 ViewDidAppear 内部。

ViewDidAppear() 发生在您的视图再次出现在屏幕上时。所以这意味着，当 AVPlayer 关闭时，它会返回到该 View，并且 AVPlayer 将再次呈现。

你有两个选择：

为该按钮创建一个 UIButton 和一个动作

var button = UIButton(frame: CGRect(0, self.view.frame.height*0.9, self.view.frame.width, self.view.frame.height*0.1))
button.addTarget(self, #selector(VideoController1.playController), nil)
self.view.addSubview(button)    

let fileURL = NSURL(fileURLWithPath: "/Users/jamesjarrett/Desktop/NIMS/NIMS/NIMS/Vid2.mp4")

func playController() {
    playerView = AVPlayer(url: fileURL as URL)
    playerViewController.player = playerView
    self.present(playerViewController, animated: true){
        self.playerViewController.player?.play()
    }
}

-- 或者--

如果您希望控制器仅在用户第一次看到视图时播放，就是这样，那么您可以这样做

var played = false

func viewDidAppear() {
    if(!played) {
        let fileURL = NSURL(fileURLWithPath: "/Users/jamesjarrett/Desktop/NIMS/NIMS/NIMS/Vid2.mp4")
        playerView = AVPlayer(url: fileURL as URL)
        playerViewController.player = playerView
        self.present(playerViewController, animated: true){
            played = true
            self.playerViewController.player?.play()
        }
    }
}

不要在上面引用我的代码，只是快速输入它，以便给你一个大致的想法。