Enable a button in Swift only if all text fields have been filled out

Question

I am having trouble figuring out how to change my code to make it so the Done button in the navigation bar is enabled when my three text fields are filled out.

I cur

Answer 1

This works for me: Hope it helps

  func textFieldDidEndEditing(textField: UITextField) {
        if txtField1.hasText() && textField2.hasText() && textField3.hasText(){
            doneBarButton.enabled = true
        }
    }

Answer 2

Swift 5.1 /Xcode 11

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

func setupAddTargetIsNotEmptyTextFields() {
    okButton.isHidden = true //hidden okButton
    nameUserTextField.addTarget(self, action: #selector(textFieldsIsNotEmpty), 
                                for: .editingChanged)
    emailUserTextField.addTarget(self, action: #selector(textFieldsIsNotEmpty), 
                                for: .editingChanged)
    passwordUserTextField.addTarget(self, action: #selector(textFieldsIsNotEmpty), 
                                for: .editingChanged)
    confimPasswordUserTextField.addTarget(self, action: #selector(textFieldsIsNotEmpty), 
                                for: .editingChanged)        
   }

and then create the selector method and use guard:

@objc func textFieldsIsNotEmpty(sender: UITextField) {

    sender.text = sender.text?.trimmingCharacters(in: .whitespaces)

    guard
      let name = nameUserTextField.text, !name.isEmpty,
      let email = emailUserTextField.text, !email.isEmpty,
      let password = passwordUserTextField.text, !password.isEmpty,
      let confirmPassword = confimPasswordUserTextField.text,
          password == confirmPassword          
      else
    {
      self.okButton.isHidden = true
      return
    }
    // enable okButton if all conditions are met
    okButton.isHidden = false
   }

Answer 3

why not move the checking functionality to a separate function

func setDoneButtonStatus()
{
    let habitNameText: NSString = (habitNameField.text!).stringByReplacingCharactersInRange(range, withString: string)
    let goalText: NSString = (goalField.text!).stringByReplacingCharactersInRange(range, withString: string)
    let frequencyText: NSString = (frequencyField.text!).stringByReplacingCharactersInRange(range, withString: string)

    doneBarButton.enabled = (habitNameText.length != 0) && (goalText.length != 0) && (frequencyText.length != 0)
}

and then use

func textFieldShouldReturn(textField: UITextField) -> Bool
{
    textField.resignFirstResponder()
    setDoneButtonStatus()
}

Answer 4

The best way would be to Add observer in ViewDidLoad method. Than just check in textField Delegate method whether all TextFields are filled up or not. Once its filled up call oberserver method & in that you just need to enable button.

Note:

• You can use observer for both enable or disable button

Hope it will help you.