Animate intrinsicContentSize changes

Question

I have a UIView subclass that draws a circle whose radius changes (with nice bouncy animations). The view is deciding the size of the circle.

I want this UIView subclass

Answer 1

Swift version of @stigi's answer which worked for me:

UIView.animate(withDuration: 0.2, animations: {
    self.invalidateIntrinsicContentSize()
    self.superview?.setNeedsLayout()
    self.superview?.layoutIfNeeded()
})