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How to adjust the opacity of a view

Paul Hudson    @twostraws   

Fully updated for Xcode 11.2

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)

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