How to animate a blur effect using UIVisualEffectView
Swift version: 5.6
UIKit’s UIVisualEffectView class lets us add blurring effects to any view, optionally also combining a vibrancy effect to overlaid controls to help make them stand out. This makes it perfect for partly obscuring background content when you want to present information on top, and you can even animate that presentation if you want.
First, place a UIVisualEffectView into your view controller, either using code or using IB with an outlet.
When your app launches you should clear the effect property of your visual effect view, causing it to do nothing:
visualEffectView.effect = nilWhen you want the blur to animate in – i.e., when you’re ready to show information on top – just set that effect property to a new instance of UIBlurEffect inside an animation block, like this:
UIView.animate(withDuration: 5) {
self.visualEffectView.effect = UIBlurEffect(style: UIBlurEffect.Style.prominent)
}UIKit will take care of the rest!
SPONSORED From March 20th to 26th, you can join a FREE crash course for mid/senior iOS devs who want to achieve an expert level of technical and practical skills – it’s the fast track to being a complete senior developer!
Sponsor Hacking with Swift and reach the world's largest Swift community!
Available from iOS 7.0
Similar solutions…
- How to add blur and vibrancy using UIVisualEffectView
- How to blur a view
- How to animate views with spring damping using animate(withDuration:)
- How to animate views using animate(withDuration:)
- How to animate when your size class changes: willTransition(to:)
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
