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-(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;
}