ViewDidAppear in Today Extension iOS

Question

class TodayViewController: UIViewController, NCWidgetProviding {

  var label = UILabel()
  var count = 0

override func viewWillAppear(_ animated: Bool) {
    debugPrint("viewWillAppear \(count)")
  }

In my app, it will keep on increase the count when the user press a button on the extension. Then when the user swap the notification centre away, and then reload it, the function viewWillAppear will trigger. And I found that the count is reset to 0 every time when viewWillAppear is triggered. Why?

Answer 1

You view controller might not be cached if the today view is closed. You need to save the value to disk, eg using NSUserDefaults