objective-c中播放声音的方法
2011-06-07首先加入AudioToolbox.framwork，然后加入头文件：
#import <AudioToolbox/AudioToolbox.h>
播放的代码为：
NSString *path = [[NSBundle mainBundle] pathForResource:@"crunch" ofType:@"wav"];
SystemSoundID soundID;
AudioServicesCreateSystemSoundID((CFURLRef)[NSURL fileURLWithPath:path], &soundID);
AudioServicesPlaySystemSound(soundID);