在尝试播放视频时，在展开Optional值时意外地发现了nil

Question

我正在使用AVFoundation工具包播放本地视频

我试过这段代码：

import UIKit
import AVFoundation

class ViewController: UIViewController {

var player: AVPlayer?

@IBOutlet weak var videoViewContainer: UIView!


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

func initializeVideoPlayerWithVideo() {

    // get the path string for the video from assets
    let videoString:String? = Bundle.main.path(forResource: "Air Bike", ofType: "mov")
    guard let unwrappedVideoPath = videoString else {return}

    // convert the path string to a url
    let videoUrl = URL(fileURLWithPath: unwrappedVideoPath)

    // initialize the video player with the url
    self.player = AVPlayer(url: videoUrl)

    // create a video layer for the player
    let layer: AVPlayerLayer = AVPlayerLayer(player: player)

    // make the layer the same size as the container view
    layer.frame = videoViewContainer.bounds

    // make the video fill the layer as much as possible while keeping its aspect size
    layer.videoGravity = AVLayerVideoGravity.resizeAspectFill

    // add the layer to the container view
    videoViewContainer.layer.addSublayer(layer)
}


@IBAction func playVideoButtonTapped(_ sender: UIButton) {
    // play the video if the player is initialized
    player?.play()
}
}

我正在尝试一些不同的方法，我仍然得到相同的错误消息，有人如何解决这个问题？

Answer 1

func initializeVideoPlayerWithVideo() {

    guard let path = Bundle.main.path(forResource: "jagdeep", ofType:".MOV") else {
        debugPrint("video.m4v not found")
        return
    }

    self.player = AVPlayer(url: URL(fileURLWithPath: path))

    // create a video layer for the player
    let layer: AVPlayerLayer = AVPlayerLayer(player: player)

    // make the layer the same size as the container view
    layer.frame = videoViewContainer.bounds

    // make the video fill the layer as much as possible while keeping its aspect size
    layer.videoGravity = AVLayerVideoGravity.resizeAspectFill

    // add the layer to the container view
    videoViewContainer.layer.addSublayer(layer)

    player?.play()
}

这是我的视频名称jagdeep并输入.MOV和它在我这边工作。在您使用类型mov的代码中存在问题。我只是将视频名称jagdeep.MOV拖到我的项目中并使用您的代码。它的确定

Answer 2

**use** 

layer.frame = videoViewContainer.layer.bounds 

代替

 // make the layer the same size as the container view
    layer.frame = videoViewContainer.bounds

Answer 3

感谢您的回复，好像在这里找不到文件是我的项目的截图，这可能是视频在我的主文件夹中的原因！ Screenshot