How to apply multiple animations to a view

Paul Hudson @twostraws March 11th 2021

Updated for Xcode 12.5

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 private var isEnabled = false

    var body: some View {
        Button("Press Me") {
            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.