ios 调整图片尺寸

调整图片尺寸

+ (UIImage*)imageWithImage:(UIImage*)imagescaledToSize:(CGSize)newSize;
{
                 UIGraphicsBeginImageContext( newSize );
                [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];

                UIImage* newImage =     UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();

               return newImage;

}