Swift version: 5.6
Spring animations work by changing from a start state to an end state, with a slight overshoot and bounce at the end. For example, if you want to animate a view moving from X:0 to X:100, it might move to X:120 before bouncing back to X:80, then X:110 and finally X:100, as if the animation were attached to a spring.
Spring animations are built into iOS as of iOS 7.0 and require two values: how "springy" the spring should be, and how fast it should start. The first value is specified with usingSpringWithDamping
, where higher values make the bouncing finish faster. The second value is specified with initialSpringVelocity
, where higher values give the spring more initial momentum.
Here's the code to make a view fade out, then fade it the tiniest bit, then fade out again – all done using a spring animation:
UIView.animate(withDuration: 1, delay: 1, usingSpringWithDamping: 0.5, initialSpringVelocity: 5, options: .curveEaseInOut, animations: {
self.viewToAnimate.alpha = 0
}) { _ in
self.viewToAnimate.removeFromSuperview()
}
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Available from iOS 7.0
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
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