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
｜
131
讨论
AVAudioRecorder
对象就好比
AVAudioPlayer
对象一样，也需要保持一个强引用以
防它被意外释放。
要进行录音，首先要提供一个文件地址，用于存放录音文件。如果文件不存在，
AVAudioRecorder
会自动创建这个文件，如果文件存在，
AVAudioRecorder
将会擦
除文件中的内容并覆写它。因此，如果你要避免录音数据被意外擦除，不要用同一
个地址录两次音，或者在录音完成后将录音文件移到别的地方。
录音后声音文件应该存放到游戏的安全沙盒中。一个比较好的选择是放到游戏的
Documents
目录中；在这个文件中存放的文件在设备同步时会被备份。
通过
FileManager
类来获得游戏的
Documents
目录：
let documentsURL = FileManager.default
.urls(for: FileManager.SearchPathDirectory.documentDirectory,
in:FileManager.SearchPathDomainMask.userDomainMask).last!
一旦你准备好文件路径，你就可以创建它的
URL
。注意，
URL
所指向的文件不一
定存在，如果这样，在录音开始后会真正创建这个文件：
return documentsURL.appendingPathComponent("RecordedSound.wav")
4.3
使用多个
AVAudioPlayer
问题
虽然我们可以同时使用多个
AVAudioPlayer ...
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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.