AVPlayer 音频仅在铃声打开时起作用

Question

使用 SwiftUI，我有一个自定义的 avplayer，可以自动播放和循环视频。问题是无论我是否特意告诉avplayer取消静音，它仍然是静音的。物理音量按钮没有任何作用。打开/关闭静音的唯一方法是将铃声物理切换为静音（静音）或非静音（取消静音）。

这是父视图：

struct VideoCacheView: View {
    @State private var avPlayer: AVPlayer? = nil
    public let url: String
    public let thumbnailURL: String
    var body: some View {
        if self.avPlayer != nil {
            CustomVideoPlayer(player: Binding(self.$avPlayer)!)
                .onAppear {
                    self.avPlayer?.isMuted = false
                    self.avPlayer?.play()
                }
        }
    }
}

和孩子：

struct CustomVideoPlayer: UIViewControllerRepresentable {
    @EnvironmentObject var cvm: CameraViewModel
    @Binding var player: AVPlayer
    
    func makeCoordinator() -> Coordinator {
        return Coordinator(self)
    }
    
    func makeUIViewController(context: Context) -> AVPlayerViewController {
        let controller = AVPlayerViewController()
        controller.player = self.player
        controller.showsPlaybackControls = false
        controller.videoGravity = self.cvm.videoGravity
        player.actionAtItemEnd = .none
        
        NotificationCenter.default.addObserver(context.coordinator, selector: #selector(context.coordinator.restartPlayback), name: .AVPlayerItemDidPlayToEndTime, object: player.currentItem)
        
        return controller
    }
    
    func updateUIViewController(_ uiViewController: AVPlayerViewController, context: Context) { }
    
    class Coordinator: NSObject {
        public var parent: CustomVideoPlayer
        init(_ parent: CustomVideoPlayer) {
            self.parent = parent
        }
        
        @objc func restartPlayback () {
            self.parent.player.seek(to: .zero)
        }
    }
}

为什么我的AV播放器唯一的音量控制是物理静音开关？

Answer 1

https://developer.apple.com/documentation/avfoundation/avplayer/1390127-volume

原来铃声处于静音模式时音量设置为0.0。默认将音量设置为1.0，则始终有音量。

添加了这个：

self.player?.volume = 1.0

视频重力线下方的子视图内部

Answer 2

这可以通过将

AVAudioSession

类别设置为

.playback

来完成：

try? AVAudioSession.sharedInstance().setCategory(.playback)
player.play()

另请参阅设备处于静音模式时播放音频 - ios swift