25.4 Designing the ContentView Layout
The user interface for the app will consist of two screens, the first of which will be represented by the ContentView.Swift file. Select this file to load it into the code editor and modify it so that it reads as follows:
import SwiftUI
struct ContentView: View {
@StateObject var timerData: TimerData = TimerData()
var body: some View {
NavigationView {
VStack {
Text("Timer count = \(timerData.timeCount)")
&...