How can detect watch os is ios app closed SWIFTUI

Question

How can I detect with watch os when iOS app is closed? I use swift and watchConnectivity.

Also I use swiftUI

Answer 1

On Application Terminate

There is a method as such

applicationWillTerminate(_:)

*Note By Dávid Pásztor - You will only have 5 seconds to get your message to the watch or it will not work, so make sure the message you send to the watch will be small and fast.

This method will detect that the application is being closed and will be cleared from memory. You can then add some connectivity to notify the watch.

Documentation Here: https://developer.apple.com/documentation/uikit/uiapplicationdelegate/1623111-applicationwillterminate

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On Application Move To Background

Alternatively, if you want to simply notify the watch whenever the app goes to background, aka goes inactive you can use this method.

applicationWillResignActive(_ application: UIApplication)

Documentation here: https://developer.apple.com/documentation/uikit/uiapplicationdelegate/1622950-applicationwillresignactive

Answer 2

If you are using SwiftUI

SceneDelegate.swift :

func sceneDidDisconnect(_ scene: UIScene) {
    sendMessageToWatch()
 }