NEW: Start my new Ultimate Portfolio App course with a free Hacking with Swift+ trial! >>

How to adjust the opacity of a view

Paul Hudson    @twostraws   

Updated for Xcode 12.5

Any SwiftUI view can be partially or wholly transparent using the opacity() modifier. This accepts a value between 0 (completely invisible) and 1 (fully opaque), just like the alpha property of UIView in UIKit.

For example, this creates a text view with a red background, then gives it 30% opacity:

Text("Now you see me")
    .padding()
    .background(Color.red)
    .opacity(0.3)

Modifying opacity is extremely fast – certainly something you can do as often as you need. To demonstrate that, the following code adjusts text opacity using a slider, and you’ll see you can move it around as fast and as much as you like without any performance hit:

struct ContentView: View {
    @State private var opacity = 0.5

    var body: some View {
        VStack {
            Text("Now you see me")
                .padding()
                .background(Color.red)
                .opacity(opacity)

            Slider(value: $opacity, in: 0...1)
                .padding()
        }
    }
}
Hacking with Swift is sponsored by Stream

SPONSORED Check out Stream's cross-platform open source chat SDK on GitHub! Write once and deploy your app with fully featured chat UI on iOS and macOS.

Go to GitHub

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

Similar solutions…

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

 
Unknown user

You are not logged in

Log in or create account
 

Link copied to your pasteboard.