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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")

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")

            Slider(value: $opacity, in: 0...1)
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