SwiftUI TextField focus, thanks to https://github.com/Asperi-Demo/4SwiftUI/blob/master/PlayOn_iOS/PlayOn_iOS/Findings/TestNextTextFieldFocus.swift

TestNextTextFieldFocus.swift

import SwiftUI

struct TestNextTextFieldFocus: View {
  @State var inputsValues: [String] = (0..<30).map { i in
    "test \(i) TextField axis is \(i % 2 == 0 ? ".vertical" : ".horizontal")"
  }

  @FocusState var focusedInput: Int?

  var body: some View {
    ScrollViewReader { proxy in
      ScrollView {
        LazyVStack {
          ForEach(0..<inputsValues.count, id: \.self) { i in
            TextField("Value", text: $inputsValues[i], axis: i % 2 == 0 ? .vertical : .horizontal)
              .focused($focusedInput, equals: i)
              .submitLabel(.return)
              .id(i)
              .onSubmit {
                print("submit \(i)")
                // update state here !!
                if (i + 1) < inputsValues.count {
                  focusedInput = i + 1
                } else {
                  focusedInput = nil
                }
              }
          }
        }
        .onChange(of: focusedInput) {
          print("onChange focusedInput:\(String(describing: focusedInput))")
          // react on state change here !!
          proxy.scrollTo($0, anchor: .top)
        }
      }
      .toolbar {
        ToolbarItemGroup(placement: .keyboard) {
          Spacer()
          Button {
            focusedInput = nil
          } label: {
            Text("Done")
          }
        }
      }
    }
  }
}

struct TestNextTextFieldFocus_Previews: PreviewProvider {
  static var previews: some View {
    TestNextTextFieldFocus()
  }
}