iOS 压缩UIimage图片

//压缩图片方法

- (UIImage*)imageWithImageSimple:(UIImage*)image scaledToSize:(CGSize)newSize{

    UIGraphicsBeginImageContext(newSize);

    [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];

    UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return newImage;

}