在尝试播放视频时解包可选值时意外发现 nil

Question

我正在使用 AVFoundation 套件播放本地视频

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()
}
}

我已经尝试了几种不同的方法，但仍然收到相同的错误消息，有人可以吗？我该如何解决这个问题？

Answer 1

**use** 

layer.frame = videoViewContainer.layer.bounds

而不是

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

Answer 2

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 并且它在我这边工作。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。没关系

Answer 3

感谢您的回复似乎无法在此处找到该文件是我项目的屏幕截图这可能是视频位于我的主文件夹中的原因！ Screenshot

在尝试播放视频时解包可选值时意外发现 nil

Unexpectedly found nil while unwrapping an Optional value, while trying to play video

swift

avfoundation

avplayer