-(UIImage*) OriginImage:(UIImage *)image scaleToSize:(CGSize)size
{
UIGraphicsBeginImageContext(size); //size 为CGSize类型，即你所需要的图片尺寸
[image drawInRect:CGRectMake(0, 0, size.width, size.height)];
UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return scaledImage; //返回的就是已经改变的图片
}
