NEW! Master Swift design patterns with my latest book! >>

How to animate views with spring damping using animate(withDuration:)

Paul Hudson       @twostraws

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()
}

Available from iOS 7.0

Did this solution work for you? Please pass it on!

Other people are reading…

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.

Need to know Objective-C fast?

I wrote a book dedicated to teaching Objective-C to developers who already know Swift – it's the fastest way to get up to speed!

MASTER SWIFT NOW
Buy Practical iOS 12 Buy Pro Swift Buy Swift Design Patterns Buy Practical iOS 11 Buy Swift Coding Challenges Buy Server-Side Swift (Vapor Edition) Buy Server-Side Swift (Kitura Edition) Buy Hacking with macOS Buy Advanced iOS Volume One Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with Swift Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Beyond Code

Was this page useful? Let me know!

Click here to visit the Hacking with Swift store >>