Calculate the total size of a file under a folder

-( float )fileSizeForDir:( NSString *)path //计算文件夹下文件的总大小 {           NSFileManager *fileManager = [[ NSFileManager alloc] init];      float size =0;      NSArray * array = [fileManager contentsOfDirectoryAtPath:path error: nil ];      for ( int i = 0; i<[array count]; i++)      {          NSString *fullPath = [path stringByAppendingPathComponent:[array objectAtIndex:i]];                   BOOL isDir;          if ( !([fileManager fileExistsAtPath:fullPath isDirectory:&isDir] && isDir) )          {              NSDictionary *fileAttributeDic=[fileManager attributesOfItemAtPath:fullPath error: nil ];              size+= fileAttributeDic.fileSize/ 1024.0/1024.0;          }          else          {              [ self fileSizeForDir:fullPath];          }      }      han = han + size;      return size; }

Calculate the total size of a file under a folder