How to come back to previous scene and reload data? - swift

Question

I have two Scenes on Storyboard : One to show a list of items with plus button on the Bar to go to another Scene that has form to add a new item. I'm saving on Local Storage, in the saving function I want to come back to the previous page with the new data.
This is the saving function:
#IBAction func AddTrack(_ sender: Any) {
let item = TrackItem(context: PersistenceService.context)
item.kms = Int32(kmsField!.text!)!
item.liters = Float(litersField!.text!)!
item.date = textFieldPicker!.text!
PersistenceService.saveContext()
navigationController?.popViewController(animated: true)
self.TrackList.append(item)
self.tableView?.reloadData()
}
Knowing that I'm using this function in viewDidLoad() and viewDidAppear()
func GetData(){
let fetchRequest: NSFetchRequest<TrackItem> = NSFetchRequest<TrackItem>(entityName: "TrackItem")
do{
let TrackList = try PersistenceService.context.fetch(fetchRequest)
self.TrackList = TrackList
self.tableView?.reloadData()
}catch{
}
}

Answer 1

You can use NotificationCenter or Delegation (Depends on what you are trying to achieve)
Example NotificationCenter:
VC1, takes a photo:
buttonTapped / function () {
// Upload a Photo()
NotificationCenter.default.post(name: NSNotification.Name(rawValue: "load"), object: nil)
DispatchQueue.main.asyncAfter(deadline: .now() + 2) {
self.dismiss(animated: true, completion: nil)
}
}
VC2, shows all photos:
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(loadList), name: NSNotification.Name(rawValue: "load"), object: nil)
}
#objc func loadList(notification: NSNotification) {
//get data, reload data, etc
}