iOS修改 改变图片大小

/**
 *  改变图片大小
 *
 *  @param inSize  <#inSize description#>
 *  @param inImage <#inImage description#>
 *
 *  @return <#return value description#>
 */
+(UIImage*)imageFitInCenterForSize:(CGSize)inSize forSourceImage:(UIImage*)inImage
{
    // redraw the image to fit |yourView|'s size
    CGSize imageOriginalSize = inImage.size;
    UIImage *resultImage = nil;
    if (imageOriginalSize.width<=inSize.width && imageOriginalSize.height<=inSize.height)
    {
        UIGraphicsBeginImageContextWithOptions(inSize, NO, 0.f);
        [inImage drawInRect:CGRectMake((inSize.width-imageOriginalSize.width)/2.0, (inSize.height-imageOriginalSize.height)/2.0, imageOriginalSize.width, imageOriginalSize.height)];
        resultImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
    }
    return resultImage;
}