iOS小demo之将图片压缩到指定尺寸

- (UIImage *)getScaledImageWithImage:(UIImage*)oldImage

              targetSize:(CGSize)targetSize;

{

    UIGraphicsBeginImageContext(targetSize);

    

    [oldImage drawInRect:CGRectMake(0,0,targetSize.width,targetSize.height)];

    

    UIImage* newImage =UIGraphicsGetImageFromCurrentImageContext();

    

    UIGraphicsEndImageContext();

    

    return newImage;

    

}