iOS 简单的一个文件遍历并返回文件大小

//TODO:遍历文件夹获得文件夹大小，返回多少M
+(float)getCacheSizeAtPath:(NSString*)folderPath
{
    NSFileManager* manager = [NSFileManager defaultManager];
    if (![manager fileExistsAtPath:folderPath]) return 0;
    NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:folderPath] objectEnumerator];//从前向后枚举器
    NSString* fileName;
    long long folderSize = 0;
    while ((fileName = [childFilesEnumerator nextObject]) != nil){
//        NSLog(@"fileName ==== %@",fileName);
        NSString* fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];
//        NSLog(@"fileAbsolutePath ==== %@",fileAbsolutePath);
        folderSize += [self fileSizeAtPath:fileAbsolutePath];
    }
//    NSLog(@"folderSize ==== %lld",folderSize);
    return folderSize/(1024.0*1024.0);
}

那已逝的时光