Why does a custom UIButton image does not resize in Interface Builder?

Question

Why does a custom UIButton image not resize with the button?

I set its view mode to Scale to Fill in Interface Builder, but unlike a UIImageView image, it d

Answer 1

I know this is old, but I think that the correct answer is that you should set the content mode to the "hidden" UIImageView that is inside the UIButton:

button.imageView.contentMode = UIViewContentModeScaleAspectFill;

This will change the content mode for the images views of the images set with:

[button setImage:yourAwesomeImage forState:UIControlStateNormal]; 
//Or any other state