Swift · Dismissing Modal ViewController and reload tableview afterwards

Question

this is my first iOS App. I’m using a Modal ViewlController to save new list entries. Unfortunately I can't manage to update the tableView with the new entry afterwards. Here is a screen cast o the current state of the app.

I tried other solutions on stack overflow, but somehow my app always crashes after pressing the Load New Film Button. I recognised, that most user call there Modal ViewController within the code, that doesn't worked for me either.

So I did it in the storyboard: screencast Modal ViewController via segue

Could you help me with reloading the tableView, please?

Here is my code:

This is the main ViewController:

import UIKit
import RealmSwift

class LoadedFilmsTableViewController: UITableViewController {

    let realm = try! Realm()
    var filmRolls: Results<FilmRoll>?


    override func viewDidLoad() {
        super.viewDidLoad()

        tableView.register(UINib(nibName: K.cellNibNameLoaded, bundle: nil), forCellReuseIdentifier: K.CellIdentifier.CellFilmRoll)
        loadFilmRolls()
    }        

    //MARK: - TableView Datasource Methods
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return filmRolls?.count ?? 1
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let df = DateFormatter()
        df.dateFormat = "d. MMMM yyyy"
        let dateAsString = df.string(from: filmRolls?[indexPath.row].dateLoaded ?? Date())

        let cell = tableView.dequeueReusableCell(withIdentifier: K.CellIdentifier.CellFilmRoll, for: indexPath) as! LoadedFilmCell
        cell.labelFilmStock.text = filmRolls?[indexPath.row].filmStock ?? "No film roll added yet."
        cell.labelCamera.text = filmRolls?[indexPath.row].camera ?? "No film roll added yet."
        cell.labelDateLoaded.text = dateAsString
        return cell
    }


    //MARK: - Add new Film Rolls
    @IBAction func addButtonPressed(_ sender: UIBarButtonItem) {
    }

    func loadFilmRolls() {
        filmRolls = realm.objects(FilmRoll.self)
        tableView.reloadData()
    }        
}

This it the Modal View:

import UIKit
import RealmSwift

class AddNewRollViewController: UIViewController {

    let realm = try! Realm()
    var filmRolls: Results<FilmRoll>?


    @IBOutlet weak var textFieldFilmStock: UITextField!
    @IBOutlet weak var textFieldCamera: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()

        textFieldFilmStock.placeholder = "Kodak Color Plus 200"
        textFieldCamera.placeholder = "Canon AE-1"
    }

    @IBAction func addNewFilmRollButtonPressed(_ sender: UIButton) {
        let newFilmRoll = FilmRoll()
        newFilmRoll.filmStock = textFieldFilmStock.text!
        newFilmRoll.camera = textFieldCamera.text!
        newFilmRoll.dateLoaded = Date()

        do {
            try realm.write {
                realm.add(newFilmRoll)
            }
        } catch {
            print("Error saving FilmRoll \(error)")
        }

        navigationController?.popViewController(animated: true)
        dismiss(animated: true, completion: nil)
    }
}

score 1 · Answer 1 · answered Apr 10 '20 at 17:56

When you dismiss the modal can you add code in the ccompletion, stick the loadFilmRolls func in and it should refresh it.

  override func dismiss(animated flag: Bool,
                         completion: (() -> Void)?) {
    super.dismiss(animated: flag, completion: completion)
    loadFilmRolls()
}

I've not tested it but it should work for you.

score 0 · Answer 2 · answered Apr 10 '20 at 17:47

0

In dismiss(animated: true, completion: nil) you can provide a completion block that will be executed after the view is dismissed

dismiss(animated: true, completion: {
    if let viewController = presentingViewController as? LoadedFilmsTableViewController {
        viewController.tableView.reloadData()
    }
})

answered Apr 10 '20 at 17:47

matchifang

5,190
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76

Thanks for the fast response. Unfortunately I get the following error: _Implicit use of 'self' in closure; use 'self.' to make capture semantics explicit_ I tried to fix it by adding self: `dismiss(animated: true, completion: { if let viewController = self.presentingViewController as? LoadedFilmsTableViewController { viewController.tableView.reloadData() } })` in the result nothing happened after dismissing the view – still no reload. Any idea? – Daniel Apr 10 '20 at 18:38

Swift · Dismissing Modal ViewController and reload tableview afterwards

2 Answers2