CaseStudyTabView.swift

import SwiftUI

struct CaseStudyTabView: View {
    var body: some View {
        TabView {
            VStack {
                LifecycleMonitor(label: "Tab 1")
                Text("`TabView` initializes the state for each tab’s content view all at once when it first appears. `onAppear` and `onDisappear` get called as you switch between tabs. State of offscreen tabs is kept alive.")
                    .font(.callout)
                    .frame(maxWidth: .infinity, alignment: .leading)
            }
            .padding()
            .tabItem {
                Label("Tab 1", systemImage: "1.circle")
            }
            LifecycleMonitor(label: "Tab 2")
                .padding()
                .tabItem {
                    Label("Tab 2", systemImage: "2.circle")
                }
            LifecycleMonitor(label: "Tab 3")
                .padding()
                .tabItem {
                    Label("Tab 3", systemImage: "3.circle")
                }
            LifecycleMonitor(label: "Tab 4")
                .padding()
                .tabItem {
                    Label("Tab 4", systemImage: "4.circle")
                }
        }
        .navigationTitle("TabView")
    }
}

struct CaseStudyTabView_Previews: PreviewProvider {
    static var previews: some View {
        CaseStudyTabView()
    }
}