How to mimic Keyboard animation on iOS 7 to add “Done” button to numeric keyboard?

Question

I had been doing something like this to mimic the keyboard animation on older version of iOS.

CGRect keyboardBeginFrame;
[[note.userInfo objectForKey:UIKeybo         


        

Answer 1

iOS 10+
Swift 5

A more modern alternative (iOS 10+ and Swift) is to use UIViewPropertyAnimator, which not only accepts UIView.AnimationCurve but is a more modern animator.

Most likely you'll be working with UIResponder.keyboardAnimationCurveUserInfoKey, which we are to treat as an NSNumber. The documentation for this key is (Apple's own notation, not mine):

public class let keyboardAnimationCurveUserInfoKey: String // NSNumber of NSUInteger (UIViewAnimationCurve)

Using this approach, we can eliminate any guesswork and just plug and play:

if let kbDuration = notification.userInfo?[UIResponder.keyboardAnimationDurationUserInfoKey] as? NSNumber,
    let kbTiming = notification.userInfo?[UIResponder.keyboardAnimationCurveUserInfoKey] as? NSNumber, // doc says to treat as NSNumber
    let timing = UIView.AnimationCurve.RawValue(exactly: kbTiming), // takes an NSNumber
    let curve = UIView.AnimationCurve(rawValue: timing) // takes a raw value {
    let duration = kbDuration.doubleValue
    let animator = UIViewPropertyAnimator(duration: duration, curve: curve) {
        // add animations
    }
    animator.startAnimation()
}