TheAVAudioPlayer andAVAudioRecorder classes provide delegate methods for interruption start
and end. Implement these methods to update your user interface and optionally, after interruption ends, to resume paused playback. The system automatically pauses playback or recording upon interruption, and reactivates your audio session when you resume playback
or recording.
If you want to save and restore playback position between application launches, save playback position on interruption as well as on application quit.
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