Answer by C0mrade for How do I animate constraint changes?

Working Solution 100% Swift 5.3

i have read all the answers and want to share the code and hierarchy of lines which i have used in all my applications to animate them correctly, Some solutions here are not working, you should check them on slower devices e.g iPhone 5 at this moment.

self.btnHeightConstraint.constant = 110UIView.animate(withDuration: 0.27) { [weak self] in      self?.view.layoutIfNeeded()}