ios - Swift 3 - How to make timer work in background

Question

i am trying to do an application which can make a timer run in background.

here's my code:

let taskManager = Timer.scheduledTimer(timeInterval: 10, target: self, selector: #selector(self.scheduleNotification), userInfo: nil, repeats: true)
        RunLoop.main.add(taskManager, forMode: RunLoopMode.commonModes)

above code will perform a function that will invoke a local notification. this works when the app is in foreground, how can i make it work in the background?

i tried to put several print lines and i saw that when i minimize (pressed the home button) the app, the timer stops, when i go back to the app, it resumes.

i wanted the timer to still run in the background. is there a way to do it?

here's what i want to happen:

run app -> wait 10 secs -> notification received -> wait 10 secs -> notification received -> and back to wait and received again

that happens when in foreground. but not in background. pls help.

Answer 1

you can go to Capabilities and turn on background mode and active Audio. AirPlay, and picture and picture.

It really works . you don't need to set DispatchQueue . you can use of Timer.

Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { (t) in

   print("time")
}