How can I continue a timer in Today extension when the user swipes back up and closes the view? Every time I close my view, my label resets back to five minutes. The timer doesn't necessarily have to animate while the view is disappeared, but when the view loads again I would like the animation showing the updated time that passed while the view was gone to be smooth and fast. How can I keep it counting down in the background? What's the most efficient and logical way to do this? Thank you.
Here is my code thus far:
class TodayViewController: UIViewController, NCWidgetProviding {
var backgroundTaskIdentifier: UIBackgroundTaskIdentifier?
@IBOutlet weak var timerLabel: UILabel!
var counter = 300
var newCount = Int()
var timer: Timer?
override func viewDidLoad() {
super.viewDidLoad()
timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(updateInfo), userInfo: nil, repeats: true)
RunLoop.main.add(timer!, forMode: RunLoopMode.commonModes)
}
func updateInfo(){
let formatter = DateComponentsFormatter()
formatter.unitsStyle = .positional
self.timerLabel.text = formatter.string(from: TimeInterval(self.counter))
counter -= 1
print(counter)
}
func widgetPerformUpdate(completionHandler: (@escaping (NCUpdateResult) -> Void)) {
completionHandler(NCUpdateResult.newData)
}
override func viewDidDisappear(_ animated: Bool) {
counter -= 1
}
}