SwiftUI: Pop to root view when selected tab is tapped again

Here is possible approach. For TabView it gives the same behaviour as tapping to the another tab and back, so gives persistent look & feel.

Tested & works with Xcode 11.2 / iOS 13.2

Full module code:

import SwiftUI

struct TestPopToRootInTab: View {
    @State private var selection = 0
    @State private var resetNavigationID = UUID()

    var body: some View {

        let selectable = Binding(        // << proxy binding to catch tab tap
            get: { self.selection },
            set: { self.selection = $0

                // set new ID to recreate NavigationView, so put it
                // in root state, same as is on change tab and back
                self.resetNavigationID = UUID()
        })

        return TabView(selection: selectable) {
            self.tab1()
                .tabItem {
                    Image(systemName: "1.circle")
                }.tag(0)
            self.tab2()
                .tabItem {
                    Image(systemName: "2.circle")
                }.tag(1)
        }
    }

    private func tab1() -> some View {
        NavigationView {
            NavigationLink(destination: TabChildView()) {
                Text("Tab1 - Initial")
            }
        }.id(self.resetNavigationID) // << making id modifiable
    }

    private func tab2() -> some View {
        Text("Tab2")
    }
}

struct TabChildView: View {
    var number = 1
    var body: some View {
        NavigationLink("Child \(number)",
            destination: TabChildView(number: number + 1))
    }
}

struct TestPopToRootInTab_Previews: PreviewProvider {
    static var previews: some View {
        TestPopToRootInTab()
    }
}