列出程序目录中的指定文件夹的所有文件

    NSFileManager *m = [NSFileManager defaultManager];
    NSArray *fileList = [m directoryContentsAtPath:[[[[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]
                                                      stringByAppendingPathComponent:@"163"] 
                                                     stringByAppendingPathComponent:@"songzi"] stringByAppendingPathComponent:@"pictures"]];
    for (NSString *s in fileList){
        NSLog(s);
    }