How to reload the table view after dismissing a modal

Question

I'm currently having the user input data on a modal and save it to Core Data:

var container: NSPersistentContainer!

func saveContext() {
    if container.viewContext.hasChanges {
        do {
            try container.viewContext.save()
        } catch {
            print("An error occured whlie saving: \(error.localizedDescription)")
        }
    }
}

Upon dismissing the modal, I want to reload the table on the parent view controller. But, no matter how I load it, from viewDidLoad or viewWillAppear, the table doesn't get reloaded. I know that the data is properly saved into Core Data because when I rebuild, the data gets properly displayed on the table.

This is the function I want to trigger upon dismissing the modal:

func loadSavedData() {
    if fetchedResultsController == nil {
        let request = Goal.createFetchRequest()
        let sort = NSSortDescriptor(key: "title", ascending: true)
        request.sortDescriptors = [sort]
        request.fetchBatchSize = 20
        
        fetchedResultsController = NSFetchedResultsController(fetchRequest: request, managedObjectContext: container.viewContext, sectionNameKeyPath: "title", cacheName: nil)
        fetchedResultsController.delegate = self
    }
    
    fetchedResultsController.fetchRequest.predicate = myPredicate
    
    do {
        try fetchedResultsController.performFetch()
        tableView.reloadData()
    } catch {
        print("Fetch failed")
    }
}

Answer 1

In this article of Sean Berry published in Medium, you can know more about the reason why viewWillAppear is not called.

Then, you can use a closure to know when your modal is dismissed.

Add it in your modal view controller:

var isDismissed: (() -> Void)?

Then you can call it when you dismiss the controller:

self.isDismissed?()

Finally in the presenting view controller, when you init your modal, you can listen for the closure, for example:

let modalController = YourController()
modalController.isDismissed = { [weak self] in
   self?.loadSavedData()
}