我正在开发一个用swift 2.0编写的音乐应用程序 .
现在，我正在用AVPlayer实现视频播放器部分 .
我想添加一个功能，如果用户 swipes down any place in the modal(in the movie player), the modal gets dismissed downward. （像ios youtube播放器;他们实际上并没有关闭播放器）
我研究了如何实现此功能并找到了以下解决方案
Stackoverflow回答：In iOS, how to drag down to dismiss a modal?
完整教程：http://www.thorntech.com/2016/02/ios-tutorial-close-modal-dragging/
它运作良好，但有一个问题 AVPlayer is freezing when the pan gesture is made （手指在屏幕上） . 音频正常播放 . 只有视频冻结了 .
这是代码处理平移手势 .
@IBAction func handleGesture(sender: UIPanGestureRecognizer) {
let percentThreshold:CGFloat = 0.2
// convert y-position to downward pull progress (percentage)
let translation = sender.translationInView(view)
let verticalMovement = translation.y / view.bounds.height
let downwardMovement = fmaxf(Float(verticalMovement), 0.0)
let downwardMovementPercent = fminf(downwardMovement, 1.0)
let progress = CGFloat(downwardMovementPercent)
guard let interactor = interactor else { return }
switch sender.state {
case .Began:
interactor.hasStarted = true
dismissViewControllerAnimated(true, completion: nil)
case .Changed:
interactor.shouldFinish = progress > percentThreshold
interactor.updateInteractiveTransition(progress)
case .Cancelled:
interactor.hasStarted = false
interactor.cancelInteractiveTransition()
case .Ended:
interactor.hasStarted = false
if interactor.shouldFinish {
interactor.finishInteractiveTransition()
} else {
interactor.cancelInteractiveTransition()
}
default:
break
}
}
After "dismissViewControllerAnimated(true, completion: nil)" is called (case .Began:), "currentVideoFrameRate" (avPlayer.currentItem?.tracks.first?.currentVideoFrameRate) is reduced from approx. 29 to 4 .
似乎内部控制了利率 . 我仍然不知道如何防止降低帧速率 .
我想让AVPlayer正常播放视频，即使它正在转换（.Changed status）
有谁知道如何解决这个问题？
谢谢！