压缩图片

    NSData *data = UIImageJPEGRepresentation(image, 0.001);

    UIImage * preImage = [UIImage imageWithData:data];

    [preImage drawInRect:CGRectMake(0, 0, ScreenWidth, ScreenHeight)];

 

压缩图片分压和缩

如果只压，压到一定比例就不能再压了

所以还要缩