How can I detect when the swift application is foreground from the background?

Question

I want to run a function in my application if the application is not running from the background. How can I do that?

I cannot use applicationDidBecomeActive and applicationDidEnterBackground because I need to detect the situation when it comes from the background, not the state when it is being taken to the background or when it is opened. Also, when the application is opened for the first time, it will not work when it comes from the background.

Answer 1

Check the current state:

Use UIApplication.shared.applicationState.

switch UIApplication.shared.applicationState {
case .active: // The app is running in the foreground and currently receiving events.
case .inactive: // The app is running in the foreground but is not receiving events. This might happen as a result of an interruption or because the app is transitioning to or from the background.
case .background: // The app is running in the background.
}