Tab to next text field when 'next/return' key hit on keyboard in SwiftUI - keyboard

Question

This is strictly for SwiftUI.
I would like to have the keyboard move to the next available text field when the user hits the 'return' key on the keyboard.
I have the following view:
var body: some View {
VStack {
NavigationView {
Form {
TextField("First name", text: $model.firstname)
.tag(1)
TextField("Last name", text: $model.lastname)
.tag(2)
}
.navigationBarTitle("Add a Person", displayMode: .inline)
}
}
}
And the following code that should allow the tab:
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
let nextTag = textField.tag + 1
if let nextResponder = textField.superview?.viewWithTag(nextTag) {
nextResponder.becomeFirstResponder()
} else {
textField.resignFirstResponder()
}
return true
}
I am just not sure how to implement it in SwiftUI?
How do I assign it to the delegate of the textfield?!
****UPDATE****
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
print("Current Tag: ", textField.tag) // Works correctly
let nextTag = textField.tag + 1
print("Next Tag: ", nextTag) // Works correctly
let nextResponder = textField.superview?.viewWithTag(nextTag) as UIResponder? // ALWAYS RETURN NIL
....
Not sure why the assignment of nextResponder always returns nil?!

Answer 1

iOS15+
Now it can be easily done with FocusState+.focused(,equals:) specifying named tags and updating focus state on needed action.
Tested with Xcode 13.3 / iOS 15.4
Here is main part:
#FocusState private var infocus: Field?
enum Field {
case first, last
}
// ...
TextField("First name", text: $firstname,
onCommit: { infocus = .last }) // << here !!
.focused($infocus, equals: .first)
Complete test module in project is here