How to change the style of image with a event in swiftui?

Here is an example on how to change a button size when tapped.

struct MyPrimitiveButtonStyle: PrimitiveButtonStyle {
    var color: Color

    func makeBody(configuration: PrimitiveButtonStyle.Configuration) -> some View {
        MyButton(configuration: configuration, color: color)
    }
  
    struct MyButton: View {
        @GestureState private var pressed = false

        let configuration: PrimitiveButtonStyle.Configuration
        let color: Color

        var body: some View {
            let longPress = LongPressGesture(minimumDuration: .infinity, maximumDistance: .infinity)
                .updating($pressed) { value, state, _ in state = value }
                .onEnded { _ in
                   self.configuration.trigger()
                 }

            return configuration.label
                .foregroundColor(.white)
                .padding(15)
                .background(RoundedRectangle(cornerRadius: 5).fill(color))
                .compositingGroup()
                .shadow(color: .black, radius: 3)
                .opacity(pressed ? 0.5 : 1.0)
                .scaleEffect(pressed ? 0.8 : 1.0)
                .gesture(longPress)
        }
    }
}

Called as:

            Button(action: {
            }){ Text("My primitive Button").padding() }
                .buttonStyle(MyPrimitiveButtonStyle(color: .red))

If you want to change another object, you should use @EnvironmentObject and @Published.

This tutorial should help:

h ttps://www.hackingwithswift.com/quick-start/swiftui/how-to-use-environmentobject-to-share-data-between-views