iphone怎样把音频文件写入本地文件，然后从本地文件读取到内存，进行播放音频？

转载自：http://yueding920.blog.163.com/blog/static/35250890201081654434139/

类似这样吧：
NSData *mp3Data = [[NSData alloc] initWithContentsOfURL:url]; 
NSString *filePath = [NSHomeDirectory() stringByAppendingPathComponent: @"Documents/xxx.mp3"];
[mp3Data writeToFile:filePath];

播放：
player = [[AVAudioPlayer alloc] initWithContentsOfURL: [NSURL fileURLWithPath:filePath] error: nil];
[player play];