SALE: Save 50% on all my books and bundles >>

How to make a UIView glow using shadowColor

Swift version: 5.1

Paul Hudson    @twostraws   

All views can have shadows thanks to the CALayer behind them, but you can use that same property to create glow effects. For example, this creates a 128x128 view then gives it a 20-point yellow glow:

let vw = UIView(frame: CGRect(x: 100, y: 100, width: 128, height: 128))
vw.backgroundColor = .white

vw.layer.shadowOffset = .zero
vw.layer.shadowColor = UIColor.yellow.cgColor
vw.layer.shadowRadius = 20
vw.layer.shadowOpacity = 1
vw.layer.shadowPath = UIBezierPath(rect: vw.bounds).cgPath

Bright glows work best on a dark background, so try making your main view black:

view.backgroundColor = .black
Hacking with Swift is sponsored by RevenueCat

SPONSORED Building in-app subscriptions are hard. RevenueCat makes it simple. With their open source SDKs, you can painlessly implement subscriptions for your app in hours, not months.

Explore the docs to learn more

Sponsor Hacking with Swift and reach the world's largest Swift community!

Cascable unleashes the power of your camera and unlocks powerful workflows for shooting, managing, and geotagging your photos.

Available from iOS 3.2

Similar solutions…

About the Swift Knowledge Base

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

BUY OUR BOOKS
Buy Pro Swift Buy Swift Design Patterns Buy Testing Swift Buy Hacking with iOS Buy Swift Coding Challenges Buy Swift on Sundays Volume One Buy Server-Side Swift (Vapor Edition) Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Advanced iOS Volume Three Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with macOS Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Server-Side Swift (Kitura Edition) Buy Beyond Code

Was this page useful? Let us know!

Average rating: 4.0/5