iOS 16下AVPlayerViewController设showsPlaybackControls=true却不显示播放控件？

问题分析 #

iOS 16 后，AVPlayerViewController 的控件显示逻辑发生变更，直接设置 showsPlaybackControls = true 可能因视图未完成布局、播放器状态未稳定，导致控件无法初始化显示。但点击视频后触发了控件初始化流程，此时设置 false 可隐藏控件，也验证了这一点。

可行修复方案 #

方案1：延迟设置播放控件属性 #

在播放器启动后，延迟一小段时间再设置控件属性，确保视图布局和播放器状态稳定：

var playerController = AVPlayerViewController()
var playerItem = AVPlayerItem(asset: assetComp)
player = AVPlayer(playerItem: playerItem)
playerController.player = player
self.view.addSubview(playerController.view)
self.addChild(playerController)
player.play()

// 延迟执行，保证视图布局完成
DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
    playerController.showsPlaybackControls = true
}

方案2：在布局完成后设置 #

若在自定义 ViewController 中使用，可重写 viewDidLayoutSubviews，在视图布局完成后设置控件属性：

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    playerController.showsPlaybackControls = true
}

方案3：监听播放器就绪状态 #

监听 AVPlayerItem 的就绪状态，待资源加载完成后再设置控件：

var playerController = AVPlayerViewController()
var playerItem = AVPlayerItem(asset: assetComp)
player = AVPlayer(playerItem: playerItem)
playerController.player = player
self.view.addSubview(playerController.view)
self.addChild(playerController)

// 监听播放器状态，就绪后再设置控件
var statusObserver: NSKeyValueObservation?
statusObserver = playerItem.observe(\.status, options: [.new]) { [weak self] item, _ in
    guard let self = self, item.status == .readyToPlay else { return }
    self.playerController.showsPlaybackControls = true
    self.player.play()
    statusObserver = nil
}

内容的提问来源于stack exchange，提问作者ItsAlwaysThere