An implementation for making tab bar item action

actionTabBarItem.swift

struct ContentView: View {

    @State private var selection = 0
    
    private var actionSelection: Binding<Int> {
        Binding<Int>(get: {
            self.selection
        }) { (newValue: Int) in
            if newValue == 1 {
              // put action here
            } else {
                self.selection = newValue
            }
        }
    }
    
    var body: some View {
        TabView(selection: actionSelection) {
            FirstView()
                .tabItem {
                    VStack {
                        Image("first")
                        Text("First")
                    }
            }
            .tag(0)
            ActionView()
                .font(.title)
                .tabItem {
                    VStack {
                        Image("action")
                        Text("Action")
                    }
            }
            .tag(1)
        }
    }
}