SwiftUI TabBar: Action for tapping TabItem of currently selected Tab to reset view - swift

Question

The app I am working on is based around a TabBar, and when I am on a tab I want to be able to click the tabItem again to reset the view, similar to how Twitter does it in their tabBar.
I do not know how to recognize that action though. Adding a button to the TabItem is not working, addidng a tapGesture modifier isn't either, and I can't think of anything else I could try.
struct ContentView: View {
var body: some View {
TabView() {
Text("Tab 1")
.tabItem {
Image(systemName: "star")
.onTapGesture {
print("Hello!")
}
Text("One")
}
.tag(0)
Text("Tab 2")
.tabItem {
Button(action: {
print("Hello!")
}, label: {
Image(systemName: "star.fill")
})
}
.tag(1)
}
}
}
It should't automatically reset when opening the tab again, which I have seen discussed elsewhere, but when tapping the tabItem again.
What other things am I possibly missing here?

Answer 1

Here is possible solution - inject proxy binding around TabView selection state and handle repeated tab tapped before bound value set, like below.
Tested with Xcode 12.1 / iOS 14.1
struct ContentView: View {
#State private var selection = 0
var handler: Binding<Int> { Binding(
get: { self.selection },
set: {
if $0 == self.selection {
print("Reset here!!")
}
self.selection = $0
}
)}
var body: some View {
TabView(selection: handler) {
Text("Tab 1")
.tabItem {
Image(systemName: "star")
Text("One")
}
.tag(0)
Text("Tab 2")
.tabItem {
Image(systemName: "star.fill")
}
.tag(1)
}
}
}