Swiftui: Pop to Root View When Selected Tab Is Tapped Again

Pop to root view using Tab Bar in SwiftUI

We can use tab bar selection binding to get the selected index. On this binding we can check if the tab is already selected then pop to root for navigation on selection.

struct ContentView: View {

@State var showingDetail = false
@State var selectedIndex:Int = 0

var selectionBinding: Binding<Int> { Binding(
    get: {
        self.selectedIndex
    },
    set: {
        if $0 == self.selectedIndex && $0 == 0 && showingDetail {
            print("Pop to root view for first tab!!")
            showingDetail = false
        }
        self.selectedIndex = $0
    }
)}

var body: some View {
    
    TabView(selection:selectionBinding) {
        NavigationView {
            VStack {
                Text("First View")
                NavigationLink(destination: DetailView(), isActive: $showingDetail) {
                    Text("Go to detail")
                }
            }
        }
        .tabItem { Text("First") }.tag(0)
        
        Text("Second View")
            .tabItem { Text("Second") }.tag(1)
    }
  }
}

struct DetailView: View {
 var body: some View {
    Text("Detail")
  }
}

How can I pop to the Root view using SwiftUI?

Setting the view modifier isDetailLink to false on a NavigationLink is the key to getting pop-to-root to work. isDetailLink is true by default and is adaptive to the containing View. On iPad landscape for example, a Split view is separated and isDetailLink ensures the destination view will be shown on the right-hand side. Setting isDetailLink to false consequently means that the destination view will always be pushed onto the navigation stack; thus can always be popped off.

Along with setting isDetailLink to false on NavigationLink, pass the isActive binding to each subsequent destination view. At last when you want to pop to the root view, set the value to false and it will automatically pop everything off:

import SwiftUI

struct ContentView: View {
    @State var isActive : Bool = false

    var body: some View {
        NavigationView {
            NavigationLink(
                destination: ContentView2(rootIsActive: self.$isActive),
                isActive: self.$isActive
            ) {
                Text("Hello, World!")
            }
            .isDetailLink(false)
            .navigationBarTitle("Root")
        }
    }
}

struct ContentView2: View {
    @Binding var rootIsActive : Bool

    var body: some View {
        NavigationLink(destination: ContentView3(shouldPopToRootView: self.$rootIsActive)) {
            Text("Hello, World #2!")
        }
        .isDetailLink(false)
        .navigationBarTitle("Two")
    }
}

struct ContentView3: View {
    @Binding var shouldPopToRootView : Bool

    var body: some View {
        VStack {
            Text("Hello, World #3!")
            Button (action: { self.shouldPopToRootView = false } ){
                Text("Pop to root")
            }
        }.navigationBarTitle("Three")
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

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