Animated hamburger menu (inspired by Javi Perez's Nominazer app) using iOS 10's new UIViewPropertyAnimator class. (Beware: heavily documented with personal notes on UIViewPropertyAnimator and its intricacies.)
Read more about animating constraints with UIViewPropertyAnimator: https://medium.com/@sdrzn/animating-constraints-using-ios-10s-new-uiviewpropertyanimator-944bbb42347b