如何取消 iOS 应用程序的睡眠模式？

Question

I am working on an iOS application where the app is supposed to make a server request before going to background mode. I app should not wait for the response as that's not needed. The sole purpose of this request is that I need to keep the status of the app in my DB to know if the user is online/offline.

As the app goes to background, i make the server request and put the app into sleep mode by sleep(3) so that it can successfully finish the server call.

func applicationDidEnterBackground(_ application: UIApplication) {

    //make a server call

    sleep(3) //so that app can submit request to server before closing
} 

This works fine but if I open the app again (comes to foreground) before that sleep time has been finished, the app does not respond to any kind of user inputs/taps. Even the applicationDidBecomeActive method does not get called. It waits for that sleep time to finish that I had set before.

How can I cancel the sleep mode when the app becomes active?

Answer 1

Don't use sleep . Instead, make your server request using a URLSession that is suitable for background processing:

let session = URLSession(configuration: .background(withIdentifier: "foo"))