swift, text in label doesn't change in viewDidAppear() - swift

Question

I'm new to IOS developtment but I'm programming an app where the user selects a row from a tableView (view 1). The text that the user selected is then displayed in a label on the same screen. When the user pushes the button the text from the label is stored in UserDefaults and the view changes to view 2. Here I have the viewDidAppear() method that gets the String out of the UserDefaults and changes the text of another Label on view 2.
Here is the code for view 1. The function that is called when the button is clicked is called schoolChosenClicked():
import UIKit
class ChooseSchool: UIViewController, UITableViewDataSource, UITableViewDelegate {
var SchoolNames = [String]()
#IBOutlet weak var table: UITableView!
var refresher: UIRefreshControl!
#IBOutlet weak var LabelSchoolName: UILabel!
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return SchoolNames.count
}
//Set the context
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = UITableViewCell()
cell.textLabel?.text = SchoolNames[indexPath.row]
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
LabelSchoolName.text = SchoolNames[indexPath.row]
}
override func viewDidLoad() {
super.viewDidLoad()
SchoolNames.append("Item")
SchoolNames.append("Item")
SchoolNames.append("Item")
SchoolNames.append("")
self.table.register(UITableViewCell.self, forCellReuseIdentifier: "cell");
self.table.dataSource = self
self.table.delegate = self
self.table.reloadData()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func schoolChosenClicked(_ sender: Any) {
UserDefaults.standard.set(LabelSchoolName.text, forKey: "chosenSchool")
}
}
Here is a picture of view 1
Here is the code for view 2
import UIKit
class Login: UIViewController {
#IBOutlet weak var LabelWelcome: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func viewDidAppear(_ animated: Bool) {
if var schoolname = UserDefaults.standard.object(forKey: "chosenSchool") as? String
{
print("Das ist der Schoolname:" + schoolname+".")
LabelWelcome.text = "Willkommen bei deiner \(schoolname) App"
}
}
}
And here is the picture of the second view
In the 2nd picture you can see the Label that says "Name Anmelden". This text actually has to change to "Willkommen bei deiner (schoolname) App" but it does't or after a long period of time.
The value schoolname is well present and the print statement works fine but the LabelWelcome.text =... doesn't work or takes a long time. If I try to set the text in the viewDidLoad() method it works fine.
Do you know why or is there a method that i can call to update the screen?
Thank you,
Manuel
PS: Here is the screenshot of my login class (view 2)
Here is the first screenshot of my ChooseSchool class (view 1)
Here is the second screenshot of my ChooseSchool class (view 1

Answer 1

You need to select table cell or need to add text when clicking on the button:
#IBAction func schoolChosenClicked(_ sender: Any) {
LabelSchoolName.text = SchoolNames[indexPath.row]
UserDefaults.standard.set(LabelSchoolName.text, forKey: "chosenSchool")
}
After that still you getting the problem then add synchronize like this when you add your text in userdefault(This is not recommended):
UserDefaults.standard.set(LabelSchoolName.text, forKey: "chosenSchool")
UserDefaults.standard.synchronize()