This is my code:

struct 起始界面: View {

@State var selectedTab: Int = 0
var toggleson = false

var body: some View {
    
        TabView(selection: $selectedTab) {
            欢迎界面(buttonaction: {
               
                    selectedTab = 1
                
                   

            })
                .tag(0)
                
            
            调研界面(buttonaction: {
                selectedTab = 2
            })
                .tag(1)
            
            问题2(buttonaction: {
                selectedTab = 3
            }, returnaction: {
                selectedTab = 1
            })
                .tag(2)
            
            问题3(returnaction: {
                selectedTab = 2
            })
                .tag(3)
            
        }
       
    
   
}

}

I have tried

withAnimation{selectedTab = 1},

and View().transition,

but there still no transition animation. I wish to add transition after i clicked the button.