我需要我的第二个视图，我想按下按钮后出现在标签栏前面显示，而不是后面，因为它是。

struct ContentView: View {
   
    @State private var tabSelection = 1
    @EnvironmentObject var timerModel: TimerModel
    
    
    var body: some View
    {
        TabView(selection: $tabSelection) {
            DashboardView()
                .tag(1)
            TimerView()
                .tag(2)
                .environmentObject(timerModel)
            SettingsView()
                .tag(3)
            
        }
        .overlay(alignment: .bottom)
        {
            CustomTabView(tabSelection: $tabSelection)
        }
   

    }
}
struct ContentView_Previews: PreviewProvider {
    static var previews: some View
    {
        ContentView()
            .environmentObject(TimerModel())
    }
}
    `

     @ViewBuilder
    func NewTimerView()->some View
    {
        VStack(spacing: 15) {
            Text("Change Timer Settings")
                .font(.title2.bold())
                .foregroundStyle(.black)
                .padding(.top, 10)
           etc content...
}

     NewTimerView()
                    .frame(maxHeight: .infinity, alignment: .bottom)
                    .offset(y : timerModel.addNewTimer ? 0 : 600)
                    .zIndex(timerModel.addNewTimer ? 1 : 0)
            }
            .animation(.easeInOut, value: timerModel.addNewTimer)