Couldn't segue to another view controller from textField - ios

Question

I want to have the pretty simple transition from the home view where the user enters the text in the textfield, then have its segue go to the next view controller. I did implement the function textFieldShouldReturn(textField: UITextField) -> Bool which tries to perform the segue, but didn't get the desired result.
Here's the part of the code
class LogInVC: UIViewController {
#IBOutlet weak var logInLabel: UILabel!
#IBOutlet weak var logInField: UITextField!
override func viewDidLoad() {
NSLog("LogIn view loaded, setting delegate")
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func viewDidAppear(_ animated: Bool) {
NSLog("viewWillAppear: Performing possible queued updates")
textFieldShouldReturn(textField: logInField)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
guard let autoCheckInVC = segue.destination as?
AutocheckInVC else {
preconditionFailure("Wrong destination type: \(segue.destination)")
}
guard logInField.text != nil else {
preconditionFailure("Text property should not be nil")
}
}
func textFieldShouldReturn(textField: UITextField) -> Bool {
self.performSegue(withIdentifier: "AutoCheckInVC", sender: self)
return true
}
}
Any quick help for debugging this would be so greatly appreciated. I have tried quite much time fixing this, but I haven't found the way out!!!

Answer 1

You have a few errors in your code:
To be able to call textFieldShouldReturn you need to inherit from UITextFieldDelegate and set the delegate of your textField, logInField.delegate = self
Don´t call textFieldShouldReturn from viewDidAppear
Use the latest syntax for the method textFieldShouldReturn
You got the warning result of call to this method is unused because it was never called since you never had the delegates
Try this code instead of yours:
class LogInVC: UIViewController, UITextFieldDelegate {
#IBOutlet weak var logInLabel: UILabel!
#IBOutlet weak var logInField: UITextField!
override func viewDidLoad() {
NSLog("LogIn view loaded, setting delegate")
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
logInField.delegate = self
}
override func viewDidAppear(_ animated: Bool) {
NSLog("viewWillAppear: Performing possible queued updates")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
guard let autoCheckInVC = segue.destination as?
ViewController else {
preconditionFailure("Wrong destination type: \(segue.destination)")
}
guard logInField.text != nil else {
preconditionFailure("Text property should not be nil")
}
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
self.performSegue(withIdentifier: "AutoCheckInVC", sender: self)
return true
}
}