如何修改AVPictureInPictureController的快进快退时间值？

系统默认的PiP模式快进/快退步长是15秒，Apple目前没有提供直接修改该值的公开API，但可以通过拦截远程控制事件并手动执行自定义步长的seek操作来实现需求：

1. 让视图控制器支持接收远程控制事件
   重写视图控制器的生命周期方法，完成远程控制事件的注册/注销，并确保控制器能成为第一响应者：

   override func viewDidAppear(_ animated: Bool) {
       super.viewDidAppear(animated)
       UIApplication.shared.beginReceivingRemoteControlEvents()
       becomeFirstResponder()
   }
   
   override func viewWillDisappear(_ animated: Bool) {
       super.viewWillDisappear(animated)
       UIApplication.shared.endReceivingRemoteControlEvents()
       resignFirstResponder()
   }
   
   override var canBecomeFirstResponder: Bool {
       return true
   }
   

2. 拦截并处理快进/快退事件
   重写remoteControlReceived(with:)方法，捕获系统的快进快退事件，替换为自定义的10秒步长seek操作：

   override func remoteControlReceived(with event: UIEvent?) {
       guard let event = event, event.type == .remoteControl else { return }
       guard let player = playerViewController?.player else { return }
       
       let customStep: TimeInterval = 10 // 自定义步长为10秒
       
       switch event.subtype {
       case .remoteControlEndSeekingForward:
           let targetTime = CMTimeGetSeconds(player.currentTime()) + customStep
           player.seek(to: CMTime(seconds: targetTime, preferredTimescale: 1))
       case .remoteControlEndSeekingBackward:
           let targetTime = max(CMTimeGetSeconds(player.currentTime()) - customStep, 0)
           player.seek(to: CMTime(seconds: targetTime, preferredTimescale: 1))
       default:
           super.remoteControlReceived(with: event)
       }
   }
   

注意事项 #

• 确保你的AVPlayerViewController已开启PiP支持：playerViewController.allowsPictureInPicturePlayback = true
• 如果需要处理长按按钮的连续快进/快退，可以监听.remoteControlBeginSeekingForward和.remoteControlBeginSeekingBackward事件，通过定时器持续调整播放位置

内容的提问来源于stack exchange，提问作者Yulia