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How to apply multiple animations to a view

Paul Hudson    @twostraws   

Fully updated for Xcode 11.1

The order in which we use SwiftUI’s animation() modifier affects which modifiers get animated, and it’s also possible to add multiple animation() modifiers in order to get different animations.

For example, we could write code to create a button that animates between enabled and disabled states, making the corner rounding and background color changes. If we wanted the corner rounding to animate but not the color change, we’d use an animation such as animation(.default) after the clip shape, then animation(nil) after the background, like this:

struct ContentView: View {
    @State var isEnabled = false

    var body: some View {
        Button("Tap Me") {
            self.isEnabled.toggle()
        }
        .foregroundColor(.white)
        .frame(width: 200, height: 200)
        .background(isEnabled ? Color.green : Color.red)
        .animation(nil)
        .clipShape(RoundedRectangle(cornerRadius: isEnabled ? 100 : 0))
        .animation(.default)
    }
}

Using this technique it’s possible to animate every modifier differently if you need to.

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