添加新值时，如何从另一个viewController重新加载tableview？

Question

I already tried the answers here at StackOverFlow with the same question as mine, but it didn't work.

Here is my story board.

Story Board

Here is the code for my ViewController

var people = [Person]()

@IBOutlet weak var patientView: UITableView!

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    let fetchReq: NSFetchRequest<Person> = Person.fetchRequest()

    do{
        let people = try PersistenceService.context.fetch(fetchReq)
        self.people = people
        self.patientView.reloadData()
    }catch{

    }
}

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)

    patientView.reloadData()
}

and here is the code of my TableViewController

var people = [Person]()

@IBOutlet weak var patientName: UITextField!
@IBOutlet weak var patientAge: UITextField!

@IBAction func btnAdd(_ sender: UIButton) {

    let person = Person(context: PersistenceService.context)
    person.name = patientName.text
    person.age = Int16(patientAge.text!)!
    PersistenceService.saveContext()
    self.people.append(person)

}

@IBAction func btnClear(_ sender: UIButton) {

}

override func viewDidLoad() {
    super.viewDidLoad()
}

The problem is that when I add a person, and go back to the main ViewController, the table won't reload. However, when I close the app and open again the data will be fetch and reloaded.

Answer 1

Try this. Put the fetch request in the viewWillAppear and remove it from the viewDidLoad. Tell me if it works.

 override func viewWillAppear(_ animated: Bool) {
        let fetchReq: NSFetchRequest<Person> = Person.fetchRequest()

        do{
            let people = try PersistenceService.context.fetch(fetchReq)
            self.people = people
            self.patientView.reloadData()
        }catch{

        }
         patientView.reloadData()
    }