How do I observe app lifecycle events in UIKit with Swift?

In UIKit, observing app lifecycle events is essential to manage the state of your application effectively. You can use the `UIApplicationDelegate` and notifications to respond to various app lifecycle events.

Here's a simple example showing how to observe app lifecycle events, such as when the app enters the foreground or background:

// AppDelegate.swift import UIKit @main class AppDelegate: UIResponder, UIApplicationDelegate { var window: UIWindow? func applicationDidBecomeActive(_ application: UIApplication) { // Called when the app has become active print("App has become active") } func applicationWillResignActive(_ application: UIApplication) { // Called when the app is about to become inactive print("App will resign active") } func applicationDidEnterBackground(_ application: UIApplication) { // Called when the app enters the background print("App entered background") } func applicationWillEnterForeground(_ application: UIApplication) { // Called just before the app enters the foreground print("App will enter foreground") } func applicationWillTerminate(_ application: UIApplication) { // Called when the app is about to terminate print("App will terminate") } }

Swift UIKit App Lifecycle UIApplicationDelegate App Events NotificationCenter

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