Comment puis-je vérifier si une UITextField changements?

SWIFT

Swift 4.2

textfield.addTarget(self, action: #selector(ViewControllerr.textFieldDidChange(_:)), for: UIControl.Event.editingChanged)

et

@objc func textFieldDidChange(_ textField: UITextField) {

}

SWIFT 3 & swift 4.1

textField.addTarget(self, action: #selector(textFieldDidChange(_:)), for: .editingChanged)

et

func textFieldDidChange(_ textField: UITextField) {

}

SWIFT 2.2

textField.addTarget(self, action: #selector(YourViewController.textFieldDidChange(_:)), forControlEvents: UIControlEvents.EditingChanged)

et

func textFieldDidChange(textField: UITextField) {
    //your code
}

OBJECTIVE-C

[textField addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];

et textFieldDidChange méthode est

-(void)textFieldDidChange :(UITextField *) textField{
    //your code
}

Swift 3.0

textField.addTarget(self, action: #selector(textFieldDidChange(textField:)), for: .editingChanged)

et méthode handle:

func textFieldDidChange(textField: UITextField) { 

}

Swift 4.0

textField.addTarget(self, action: #selector(ViewController.textFieldDidChange(_:)),
                          for: UIControlEvents.editingChanged)

et méthode handle:

@objc func textFieldDidChange(_ textField: UITextField) {

}

Swift 5.0

textField.addTarget(self, action: #selector(ViewController.textFieldDidChange(_:)),
                          for: UIControl.Event.editingChanged)

et méthode handle:

@objc func textFieldDidChange(_ textField: UITextField) {

}

Swift 3

 textField.addTarget(self, action: #selector(ViewController.textFieldDidChange(sender:)), for: UIControlEvents.editingChanged)

textField(_:shouldChangeCharactersIn:replacementString:) a travaillé pour moi dans Xcode 8, Swift 3 si vous voulez vérifier chaque pression de touche.

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {

    //Whatever code you want to run here.
    //Keep in mind that the textfield hasn't yet been updated,
    //so use 'string' instead of 'textField.text' if you want to
    //access the string the textfield will have after a user presses a key

    var statusText = self.status.text
    var usernameText = self.username.text

    switch textField{
    case self.status:
        statusText = string
    case self.username:
        usernameText = string
    default:
        break
    }

    if statusText == "" && usernameText == "" {
        self.topRightButton.enabled = false
    } else {   
        self.topRightButton.enabled = true
    }

    //Return false if you don't want the textfield to be updated
    return true
}

Vous pouvez utiliser cette méthode du délégué de UITextFieldDelegate. Il se déclenche à chaque modification de caractère.

(Objective C) textField:shouldChangeCharactersInRange:replacementString:
(Swift) textField(_:shouldChangeCharactersInRange:replacementString:)

Toutefois, CELA ne se DÉCLENCHE AVANT une modification est apportée (en effet, une modification n'est effectuée si vous ne retourne true à partir d'ici).

Swift 4

textField.addTarget(self, action: #selector(textIsChanging), for: UIControlEvents.editingChanged)

@objc func textIsChanging(_ textField:UITextField) {

 print ("TextField is changing")

}

Si vous voulez faire un changement une fois que l'utilisateur a tapé dans l'complètement (Il sera appelé lorsque l'utilisateur rejeter clavier ou appuyez sur entrée).

textField.addTarget(self, action: #selector(textDidChange), for: UIControlEvents.editingDidEnd)

 @objc func textDidChange(_ textField:UITextField) {

       print ("TextField did changed") 
 }

Vous devez suivre ces étapes:

1. Faire une Prise de référence pour le textfield
2. AssignUITextFieldDelegate à la classe contrôleur
3. Configurer yourTextField.délégué
4. Mettre en œuvre quelle que soit la fonction, vous devez

Exemple de code:

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {

    @IBOutlet var yourTextFiled : UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()

        yourTextFiled.delegate = self
    }


    func textFieldDidEndEditing(_ textField: UITextField) {
        //your code
    }

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        //your code
    }

    .
    .
    .
}

créer la nouvelle classe personnalisée MaterialTextfield.swift

class MaterialTextfield: UITextField,UITextFieldDelegate {
var bottomBorder = UIView()
var shouldShowEditing = false
override func awakeFromNib() {
//Setup Bottom-Border

self.delegate = self
self.translatesAutoresizingMaskIntoConstraints = false
bottomBorder = UIView.init(frame: CGRect(x: 0, y: 0, width: 0, height: 0))
bottomBorder.backgroundColor = UIColor(rgb: 0xE2DCD1) //Set Border-Color
    bottomBorder.translatesAutoresizingMaskIntoConstraints = false
addSubview(bottomBorder)
bottomBorder.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
bottomBorder.leftAnchor.constraint(equalTo: leftAnchor).isActive = true
bottomBorder.rightAnchor.constraint(equalTo: rightAnchor).isActive = true
bottomBorder.heightAnchor.constraint(equalToConstant: 1).isActive = true //Set Border-Strength

}
@IBInspectable var hasError: Bool = false {
didSet {
if (hasError) {
bottomBorder.backgroundColor = UIColor.red//error color
        } else {
bottomBorder.backgroundColor = UIColor(rgb: 0xE2DCD1)//passive color
        }
}
}
@IBInspectable var showEditing: Bool = false{
didSet {
if (showEditing) {
bottomBorder.backgroundColor = UIColor(rgb: 0x56B5CA)//active color
        } else {
bottomBorder.backgroundColor = UIColor(rgb: 0xE2DCD1)//passive color
        }
}
}
func textFieldDidBeginEditing(_ textField: UITextField) {//listen to on edit event
    showEditing = !self.showEditing
}
func textFieldDidEndEditing(_ textField: UITextField) {//listen to on end edit event
    showEditing = !self.showEditing
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {//listen to return button event
    textField.resignFirstResponder() //return button will close keyboard
    return true
}
}

swift 4

Dans le viewDidLoad():

    //ADD BUTTON TO DISMISS KEYBOARD

//Init a keyboard toolbar 
    let toolbar = UIView(frame: CGRect(x: 0, y: view.frame.size.height+44, width: view.frame.size.width, height: 44))
toolbar.backgroundColor = UIColor.clear
//Add done button
    let doneButt = UIButton(frame: CGRect(x: toolbar.frame.size.width - 60, y: 0, width: 44, height: 44))
doneButt.setTitle("Done", for: .normal)
doneButt.setTitleColor(MAIN_COLOR, for: .normal)
doneButt.titleLabel?.font = UIFont(name: "Titillium-Semibold", size: 13)
doneButt.addTarget(self, action: #selector(dismissKeyboard), for: .touchUpInside)
toolbar.addSubview(doneButt)
USDTextField.inputAccessoryView = toolbar

Ajouter cette fonction:

    @objc func dismissKeyboard() {
//Causes the view (or one of its embedded text fields) to resign the first responder status.
      view.endEditing(true)
}