24.3 The onAppear and onDisappear Modifiers

The most basic and frequently used modifiers are onAppear() and onDisappear(). When applied to a view, these modifiers allow actions to be performed at the point that the view appears or disappears.

Within the FirstTabView.swift file, add both modifiers to the Text view as follows:

import SwiftUI

 

struct FirstTabView: View {

   

    var body: some View {

 

        Text("View One")

            .onAppear(perform: {

                print("onAppear triggered")

            })

            .onDisappear(perform: {

      ...