从 ，您可以进行一些缓冲设置，例如，您可以决定缓冲视频需要多少秒：
if #available(iOS 10.0, tvOS 10.0, OSX 10.12, *) {
avPlayer?.automaticallyWaitsToMinimizeStalling = .playWhenBufferNotEmpty
//preferredForwardBufferDuration -> default is 0, which means `AVPlayer` handle it independently, try more seconds like 5 or 10.
playerItem.preferredForwardBufferDuration = TimeInterval(5)
}
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