To call a function when application becomes active

NotificationCenter.default.addObserver(self, selector: #selector(didBecomeActive), name: NSNotification.Name.UIApplicationDidBecomeActive, object: nil)

@objc func didBecomeActive() {
print(“did become active”)
//Do signaling offline works
}

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https://developer.apple.com/library/content/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/StrategiesforHandlingAppStateTransitions/StrategiesforHandlingAppStateTransitions.html

Creation of temporary url path:

let destURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(“manifest.plist”)

Printing content of url

let contents = try String(contentsOf: destURL)

print(“!! contents:\(contents)”)