How to make zoom in zoom out button animation on tap gesture in SwiftUI?

Nice and clean swiftUI solution:

@State private var scaleValue = CGFloat(1)

...

Image("button1")
    .scaleEffect(self.scaleValue)
    .onTouchGesture(
        touchBegan: { withAnimation { self.scaleValue = 1.5 } },
        touchEnd: { _ in withAnimation { self.scaleValue = 1.0 } }
    )

however, you also need to add this code snippet to the project:

struct TouchGestureViewModifier: ViewModifier {
    let touchBegan: () -> Void
    let touchEnd: (Bool) -> Void

    @State private var hasBegun = false
    @State private var hasEnded = false

    private func isTooFar(_ translation: CGSize) -> Bool {
        let distance = sqrt(pow(translation.width, 2) + pow(translation.height, 2))
        return distance >= 20.0
    }

    func body(content: Content) -> some View {
        content.gesture(DragGesture(minimumDistance: 0)
                .onChanged { event in
                    guard !self.hasEnded else { return }

                    if self.hasBegun == false {
                        self.hasBegun = true
                        self.touchBegan()
                    } else if self.isTooFar(event.translation) {
                        self.hasEnded = true
                        self.touchEnd(false)
                    }
                }
                .onEnded { event in
                    if !self.hasEnded {
                        let success = !self.isTooFar(event.translation)
                        self.touchEnd(success)
                    }
                    self.hasBegun = false
                    self.hasEnded = false
                })
    }
}

extension View {
    func onTouchGesture(touchBegan: @escaping () -> Void,
                      touchEnd: @escaping (Bool) -> Void) -> some View {
        modifier(TouchGestureViewModifier(touchBegan: touchBegan, touchEnd: touchEnd))
    }
}

struct ScaleButtonStyle: ButtonStyle {
    func makeBody(configuration: Self.Configuration) -> some View {
        configuration.label
            .scaleEffect(configuration.isPressed ? 2 : 1)
    }
}

struct Test2View: View {
    var body: some View {
        Button(action: {}) {
            Image("button1")
        }.buttonStyle(ScaleButtonStyle())
    }
}