播放系统声音需要导入框架：AudioToolbox.framework
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System Sound ID 介绍如下：
AudioServices
AudioServices is a group of C functions in AudioToolbox for playing short (≤30 seconds) sounds.
Predefined sounds
There are some predefined system sounds, for the system sound ID in the range 1000 to 2000 (decimal), as shown below (from 2.0 to 5.0 beta). The system sounds are all stored in /System/Library/Audio/UISounds/.
