如何对AVPlayer的播放和暂停操作执行某些操作？ [英] How to perform some action on Play and Pause actions of AVPlayer?

问题描述

我使用 AVPlayer 在我的swift应用程序上播放视频。我想在视频中间放置一个播放按钮（自定义按钮）。我知道如何在点击按钮时播放和暂停视频。

I have used AVPlayer to play video on my swift application. I want to place a Play button (custom button) at the middle of video. I know how to play and pause video on tapping the button.

从默认按钮播放/暂停视频时，我找不到如何显示/隐藏自定义按钮？播放/暂停视频时是否有任何听众或触发器？

I couldn't find how to show/hide the custom button when the video is played/paused from default buttons? Are there any listener or something which triggers when the video is played/paused?

我还想隐藏默认控件中的音频和字幕图标。

I also want to hide the "Audio & Subtitles" icon from default control.

推荐答案

以下是您可以听取播放器状态更改和隐藏/显示按钮的方法:(假设您的播放器名为播放器，按钮为 playButton ）

Here is how you can listen to player state changes and hide/show buttons: (assume your player is named player, and button is playButton)

player.addObserver(self, forKeyPath: "rate", options: .New, context: nil) // somewhere after player init
...
override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) {
  if keyPath == "rate" {
    playButton.enabled = player.rate == 1 
  } else {
    super.observeValueForKeyPath(keyPath, ofObject: object, change: change, context: context)
  }
}

如果玩家的比率等于0，则意味着视频不是播放。

If rate of player is equal to 0 it means that video is not playing.

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