Most stable way to handle resizing of UIView?

Question

There are many geometric related properties on UIView.

• frame
• bounds
• transform

Maybe more.

If I want to execute some behavior when the view is resized, what should I do?

I usually tried overriding -layoutSubviews method, but it also be called by non-resizing event. Even I override all of the properties, I still can't sure I have handled all of possibilities.

What's most stable and recommended way to handle resize event?

Answer 1

In Swift, you can do:

override var bounds: CGRect {
    didSet {
        // Do stuff here
    }
}

Answer 2

I usually don't override layoutSubviews for resize, exactly because of what you said. I write my own layoutSubviewz and call it whenever it's needed, e.g. I override setFrame like this:

-(void)setFrame:(CGRect)frame
{
  [super setFrame:frame];
  [self layoutSubviewz];
}