iOS: shrink image and makes height : width = 1 : 1 - ios

Question

Here is a camera demo from iOS developer center, and the function used to shrink image is on below.
The problem what I met is image being stretched while its width < height.
However, I've need to scale and shrink the image into a square(width : height = 1 : 1).
Do anybody have solution on this?
Thanks you guys prompt helped in advance.
static UIImage *shrinkImage(UIImage *original, CGSize size) {
CGFloat scale = [UIScreen mainScreen].scale;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(NULL, size.width * scale,
size.height * scale, 8, 0, colorSpace, kCGImageAlphaPremultipliedFirst);
CGContextDrawImage(context,
CGRectMake(0, 0, original.size.width * scale, original.size.width * scale),
original.CGImage);
CGImageRef shrunken = CGBitmapContextCreateImage(context);
UIImage *final = [UIImage imageWithCGImage:shrunken];
CGContextRelease(context);
CGImageRelease(shrunken);
return final;
}

Answer 1

-(UIImage *)imageWithImage:(UIImage*)image scaledToSize:(CGSize)newSize
{
if(newSize.width > newSize.height)
newSize = CGSizeMake(newSize.height, newSize.height);
else
newSize = CGSizeMake(newSize.width, newSize.width);
UIGraphicsBeginImageContextWithOptions(newSize, YES, [UIScreen mainScreen].scale);
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
If you are not going to maintain aspect ratio, your image will surely look stretched.