January 2020
Intermediate to advanced
356 pages
6h 4m
Chinese
Content preview from Swift游戏开发经典实例
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声音
｜
141
讨论
如果没有
beginGeneratingPlaybackNotifications
调用这一句，播放通知不会发送。
如果我们不想再接收播放通知，可以调用
endGeneratingPlaybackNotifications
方法。
注意，当应用程序进入后台后，我们不会再接收播放通知。比较好的做法是，当游
戏从后台返回前台，手动更新界面，而不是依赖于播放通知。
4.8
音乐回放控制
问题
当音乐
App
正在播放时，可以控制音乐的播放吗？
解决方案
使用
MPMusicPlayerController
可以
控制音乐播放的状态：
let musicPlayer = MPMusicPlayerController.systemMusicPlayer
musicPlayer.play()
musicPlayer.pause()
musicPlayer.skipToBeginning()
musicPlayer.skipToNextItem()
musicPlayer.skipToPreviousItem()
musicPlayer.beginSeekingForward()
musicPlayer.beginSeekingBackward()
musicPlayer.stop()
讨论
记住，当我们使用共享的系统音乐播放器时，我们对回放状态进行的改变都会对所
有使用了系统播放器的应用程序产生影响。当然，其他应用程序（通常是音乐程序，
但也有可能是其他
App
）对回放状态的改变也会影响到你的
App
。
通过查询音乐播放器的
playbackState ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.