Shows how to write a basic alert view in SwiftUI with an binding variable to show the alert.

Basic_SwiftUI_Alert.swift

import SwiftUI

// This alert initializer is now deprecated but still works as of writing this
// in iOS 15.
// https://developer.apple.com/documentation/swiftui/alert
struct ContentView: View {
    
    @State private var showAlert = false
    
    var body: some View {
        Button("Show alert message") {
            showAlert.toggle()
        }
        .alert(isPresented: $showAlert) {
            Alert(title: Text("Here's an Alert Title"), message: Text("Hi, here's an alert message. 👋"), dismissButton: .cancel())
        }
    }
}

// New alert code as per Apple's documentation. 
// As of writing this, the message is not passed into the alert. 
// https://developer.apple.com/documentation/swiftui/view/alert(_:ispresented:actions:message:)-8dvt8
@available(iOS 15, *)
struct ContentView: View {
    
    @State private var showAlert = false
    let alertTitle = "Alert Title"

    
    var body: some View {
        Button("Show alert message") {
            showAlert.toggle()
        }
        .alert(alertTitle, isPresented: $showAlert) {
            Button("Hi, Alert button") {
                print("Alert button tapped")
            }
        } message: {
            Text("Hlkjlkajsd")
        }