swiftui dealloc 和 realloc AVplayer 有很多视频

Posted 2023-02-24

【中文标题】swiftui dealloc 和 realloc AVplayer 有很多视频

【英文标题】：swiftui dealloc and realloc AVplayer with many videos

【发布时间】：2020-04-07 16:10:01

【问题描述】：

我有很多同步视频。通过 Int var (var test1 和 var test2) 我希望能够只添加某个视频并删除所有其他视频，以免出现内存问题

一旦加载视图，就会为每个播放器分配值“nil”，当 test1 == test 2 时，它应该将视频加载到某个播放器和另一个“nil”中

问题在于，尽管它是绑定中的测试变量（struct VideoPlayer @Binding var testing），但它不会更新始终保持为 Nil 的播放器状态

低于我目前获得的最佳解决方案

有什么想法吗？谢谢大家

struct CustomPlayer: View 
    @Binding var test1:Int
    @Binding var test2:Int
    @State var path:String

    @State var testing:AVPlayer? = nil

    var body: some View 
            if(test1 == test2 ) 
                    self.testing? = AVPlayer(url: URL(fileURLWithPath:  Bundle.main.path(forResource: "\(path)", ofType: "mp4")!)  )
                    self.testing?.play()
             else 
                    self.testing?.replaceCurrentItem(with: nil)
            
             return ZStack
                VideoPlayer(testing: self.$testing)

            




struct VideoPlayer : UIViewControllerRepresentable 

    @Binding var testing : AVPlayer?


    func makeUIViewController(context: UIViewControllerRepresentableContext<VideoPlayer>) -> AVPlayerViewController 

        let controller = AVPlayerViewController()

        controller.player = testing
        controller.showsPlaybackControls = false
        controller.view.backgroundColor = UIColor.white
        return controller

    

    func updateUIViewController(_ uiViewController: AVPlayerViewController, context: UIViewControllerRepresentableContext<VideoPlayer>) 


    

【参考方案1】：

这是一个如何同时加载多个视频的示例（我添加了一个自动播放功能），并删除所有其他视频，但不删除所选视频。 要删除视频，请点按您要保存的视频

我不确定我是否能解决您最初的问题，但这可以为您提供下一步寻找方向的线索

代码可以复制/粘贴，因为我在一个文件中声明它以方便***使用

  import SwiftUI
  import AVKit

  struct VideoModel: Identifiable 
    let id: Int
    let name: String
    let type: String = ".mp4"
  

  final class VideoData: ObservableObject 
    @Published var videos = [VideoModel(id: 100, name: "video"),
                             VideoModel(id: 101, name: "wow"),
                             VideoModel(id: 102, name: "okay")]
  


  //Multiple item player
  struct MultipleVideoPlayer: View 
    @EnvironmentObject var userData: VideoData

    var body: some View 
      VStack(alignment: .center, spacing: 8) 
        ForEach(userData.videos)  video in
          VideoPlayer(video: .constant(video))
            .frame(minWidth: 0, maxWidth: .infinity, minHeight: 250, maxHeight: 250, alignment: .center)
        
      
    
  

  //Single item player
  struct VideoPlayer : UIViewControllerRepresentable 
    @EnvironmentObject var userData: VideoData
    @Binding var video: VideoModel

    func makeUIViewController(context: Context) -> AVPlayerViewController 
      guard let path = Bundle.main.path(forResource: video.name, ofType: video.type) else 
        fatalError("\(video.name)\(video.type) not found")
      
      let url = URL(fileURLWithPath: path)
      let playerItem = AVPlayerItem(url: url)

      context.coordinator.player = AVPlayer(playerItem: playerItem)
      context.coordinator.player?.isMuted = true
      context.coordinator.player?.actionAtItemEnd = .none

      NotificationCenter.default.addObserver(context.coordinator,
                                             selector: #selector(Coordinator.playerItemDidReachEnd(notification:)),
                                             name: NSNotification.Name.AVPlayerItemDidPlayToEndTime,
                                             object: context.coordinator.player?.currentItem)

      let controller = AVPlayerViewController()
      controller.player = context.coordinator.player
      controller.showsPlaybackControls = false
      controller.view.backgroundColor = UIColor.white

      controller.delegate = context.coordinator

      let tapRecognizer = UITapGestureRecognizer(target: context.coordinator, action: #selector(Coordinator.playerDidTap))
      controller.view.addGestureRecognizer(tapRecognizer)
      return controller
    

    func updateUIViewController(_ uiViewController: AVPlayerViewController, context: Context) 
      uiViewController.player?.play()
    

    func makeCoordinator() -> Coordinator 
      let coord = Coordinator(self)
      return coord
    


    class Coordinator: NSObject, AVPlayerViewControllerDelegate 
      var parent: VideoPlayer
      var player: AVPlayer?

      init(_ playerViewController: VideoPlayer) 
        self.parent = playerViewController
      

      @objc func playerItemDidReachEnd(notification: NSNotification) 
        if let playerItem: AVPlayerItem = notification.object as? AVPlayerItem 
          playerItem.seek(to: CMTime.zero, completionHandler: nil)
        
      


      @objc func playerDidTap()
        parent.userData.videos = parent.userData.videos.filter  videoItem in
          return videoItem.id == parent.video.id
        
      

    
  



  //preview
  struct AnotherEntry_Previews: PreviewProvider 
    static var previews: some View 
      MultipleVideoPlayer()
    
  

并在“SceneDelegate.swift”中将应用入口点替换为

  window.rootViewController = UIHostingController(rootView: MultipleVideoPlayer().environmentObject(VideoData()))

这个动作的关键是要有“VideoData”资源，你可以通过EnvironmentObject，或者其他一些共享数据的例子来实现

我添加到项目中的以下视频，包括项目的目标成员

@Published var videos = [VideoModel(id: 100, name: "video"),
                         VideoModel(id: 101, name: "wow"),
                         VideoModel(id: 102, name: "okay")]

【参考方案2】：

您的代码似乎没问题。你确定 AVPlayer(...) 路径是正确的 并且测试不是零。放

.....
self.testing?.play()
print("-----> testing: \(testing.debugDescription)")

那时 testing = nil 吗？

【讨论】：

是...调试描述返回零。我尝试在 if(test1 == test2 ) 之前添加 DispatchQueue.main.async 但结果是一样的。谢谢！

如果此时测试为零，那是因为 AVPlayer(url:..) 无法找到具有给定 url 的资源。您需要先解决此问题，然后其余代码（可能）才能工作。