One Quickie

Making a custom button style (SwiftUI->Random)
struct CustomButtonStyle: ButtonStyle {
    func makeBody(configuration: Configuration) -> some View {
            .clipShape(RoundedRectangle(cornerRadius: 25, style: .continuous))
            .scaleEffect(configuration.isPressed ? 2.0 : 1)
            .animation(.easeOut(duration: 0.05), value: configuration.isPressed)
(please don't actually make buttons with this style...) And then attach it to something (say an individual button, or a top-level view) like

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Advanced Mac OS X Programming book