Swift detect app foreground

4 Steps to Background App Refresh

Background app refresh is a feature of iOS and Android that allows apps to update their content from the internet, even while you’re not using them . In contrast, we say that apps use data in the foreground when you open and use them yourself.

First, go to your project’s settings and choose the Capabilities tab. You need to enable the Background Modes capability, then check the box marked Background Fetch . This modifies your app’s Info. plist file to add the “fetch” background mode that enables all the following functionality.28 May 2019

The Background Fetching will NOT happen in your app after the user has killed it in the multitasking UI .

On iOS, nothing gets called when your app gets killed while in the background . At the point where you move from foreground to background, you are supposed to store all the information that is needed for your app to come back looking unchanged if it gets killed and launched again.

You can keep a flag in user-defaults when application terminates and call the API in didBecomeActive when user comes back by checking the flag .

Replies (1)  terminating an app ends all processes associated with the app , handy if it gets itself in a knot, it does not remove the app, and the app can be restarted. uninstalling the app will remove it from the device.