在后台播放视频swift 3

Question

您好，我试图在后台播放视频，但它给出了一个错误，错误是“在打开可选值时意外发现nil”，并且我已经在Bundle中设置了视频，如果需要，请选择复制

这是我的代码

import UIKit
import AVFoundation

class ViewController: UIViewController {

    var avPlayer: AVPlayer!
    var avPlayerLayer: AVPlayerLayer!
    var paused: Bool = false

    override func viewDidLoad() {
        super.viewDidLoad()

        let url = Bundle.main.url(forResource: "Grad_Cap_Toss", withExtension: "mp4")


        avPlayer = AVPlayer(url: url!)
        avPlayerLayer = AVPlayerLayer(player: avPlayer)
        avPlayerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
        avPlayer.volume = 0
        avPlayer.actionAtItemEnd = AVPlayerActionAtItemEnd.none

        avPlayerLayer.frame = view.layer.bounds
        view.backgroundColor = UIColor.clear;
        view.layer.insertSublayer(avPlayerLayer, at: 0)

        NotificationCenter.default.addObserver(self,selector: Selector(("playerItemDidReachEnd:")),name: NSNotification.Name.AVPlayerItemDidPlayToEndTime,object: avPlayer.currentItem)

    }

请任何人对此有想法，谢谢

Answer 1

1. 首先，将视频文件拖放到项目中。然后导入弱播放器示例: var AVFundation.
2. Add : AVPlayer?
3. @IBOutlet var
   1. ：UIView！-将序列图像板的视图连接到VC类。
   2. 之后，你将这段代码粘贴到你的ViewController中。viewDidLoad()

中的

• 调用"playBackgoundVideo()“

​

private func playBackgoundVideo() {
    if let filePath = Bundle.main.path(forResource: "your_video_here", ofType:"mp4") {
        let filePathUrl = NSURL.fileURL(withPath: filePath)
        player = AVPlayer(url: filePathUrl)
        let playerLayer = AVPlayerLayer(player: player)
        playerLayer.frame = self.videoView.bounds
        playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
        NotificationCenter.default.addObserver(forName: .AVPlayerItemDidPlayToEndTime, object: self.player?.currentItem, queue: nil) { (_) in
            self.player?.seek(to: kCMTimeZero)
            self.player?.play()
        }
        self.videoView.layer.addSublayer(playerLayer)
        player?.play()
    }
}

这是swift 4.0 it works ^__^

Answer 2

我遇到了类似的问题，并按照Rick的答案中的说明解决了它。我的问题是我没有捆绑资源中的视频文件。检查您的视频文件是否列在项目的构建阶段下的Copy Bundle Resources中。如果没有，请使用+按钮将文件添加到其中。此外，您的代码中可能缺少avPlayer.play()语句。

Answer 3

我还试图在登录页面的视图控制器的背景中播放一个视频。我认为主要问题是您正在使用的语法已被弃用。

您的代码可能如下所示：

import UIKit
import AVKit
import AVFoundation

class ViewController: UIViewController {

@IBOutlet var blackOverlay: UIView!

// init video background and its path
var player: AVPlayer?
let videoURL: NSURL = Bundle.main.url(forResource: "videoName", withExtension: "mp4")! as NSURL

override func viewDidLoad() {
    super.viewDidLoad()

    // Adds a black overlay to the looped video in question

    blackOverlay.alpha = 0.75;
    blackOverlay.layer.zPosition = 0;

    // begin implementing the avplayer 

    player = AVPlayer(url: videoURL as URL)
    player?.actionAtItemEnd = .none
    player?.isMuted = true

    let playerLayer = AVPlayerLayer(player: player)
    playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
    playerLayer.zPosition = -1

    playerLayer.frame = view.frame

    view.layer.addSublayer(playerLayer)

    player?.play()

    // add observer to watch for video end in order to loop video

    NotificationCenter.default.addObserver(self, selector: #selector(ViewController.loopVideo), name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: self.player)

    // if video ends, will restart  

    func playerItemDidReachEnd() {
        player!.seek(to: kCMTimeZero)
    }

}
    // maybe add this loop at the end, after viewDidLoad
   // func loopVideo() { player?.seek(to: kCMTimeZero) player?.play()}}

如果这有帮助，请让我知道！