Problems scaling a UIImage to fit a UIButton - objective-c

Question

I have a set of buttons and different sized images. I want to scale each image in order that it fits the button in the correct aspect ratio. Once I've scaled the image, I set the button's image property to the scaled version.
UIImage *scaledImage = [image scaledForButton:pickerButton];
[pickerButton setImage:scaledImage forState:UIControlStateNormal];
my scaledForButton method is defined in a class extension for UIImage. It looks like this:
- (UIImage *)scaledForButton:(UIButton *)button
{
// Check which dimension (width or height) to pay respect to and
// calculate the scale factor
CGFloat imageRatio = self.size.width / self.size.height;
CGFloat buttonRatio = button.frame.size.width / button.frame.size.height;
CGFloat scaleFactor = (imageRatio > buttonRatio ? self.size.width/button.frame.size.width : self.size.height/button.frame.size.height);
// Create image using scale factor
UIImage *scaledimage = [UIImage imageWithCGImage:[self CGImage]
scale:scaleFactor
orientation:UIImageOrientationUp];
return scaledimage;
}
When I run this on an iPad2 it works fine and the images are scaled correctly. However if I run it on a retina display (both in the simulator and on a device) the image does not scale correctly and is squished into the button.
Any ideas why this would happen on retina only? I've been scratching my head for a couple of days but can't figure it out. They're both running the same iOS and I've checked the scale and ratio outputs, which are always the same, regardless of device. Many thanks.

Answer 1

Found the answer here: UIButton doesn't listen to content mode setting?
If you're setting the .contentMode, it seems you have to set the imageView property of the UIButton, not just the UIButton, then it worked properly.
The problem on iPad 3 was as Herman suggested - the CGImage was still a lot larger than the UIButton, so even though it was scaled down, it still had to be resized to fit the button.