How to do a live UITextField count while typing (Swift)?

Question

I would like to count the character when user keep typing in UITextField with swift.

Image of Field and Label:

Answer 1

Swift 5.3

Add UITextFieldDelegate in you viewController with outlets

class ViewController: UIViewController, UITextFieldDelegate{
     @IBOutlet weak var txtGroupName: UITextField!
     @IBOutlet weak var lblWordCount: UILabel!

Add textfeild delegate in your viewDidLoad() like below

override func viewDidLoad() {
   super.viewDidLoad()
   txtGroupName.addTarget(self, action: #selector(self.textFieldDidChange(textField:)), for: UIControl.Event.editingChanged)
  }
    
   @objc func textFieldDidChange(textField : UITextField){
    self.lblWordCount.text = "\(self.txtGroupName.text!.count)/"+"\(65)"
  }

We have set also meximum text limit 65 . you can replace 65 to what you want.

extension viewController:UITextFieldDelegate{
    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        if !(textField.text?.isEmpty ?? true){
            return textField.text!.count +  (string.count - range.length) <= 65
        }
        return true
    }
}

It's output is like below

Answer 2

In Swift
viewDidLoad {
self.yourTextView.delegate = self
self.updateCharacterCount()
}

func updateCharacterCount() {
    self.yourLabel.text = "\((65) - self.yourTextView.text.characters.count)"  
}

func textViewDidChange(textView: UITextView) {
    self.updateCharacterCount()
}


func textView(textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {
    self.updateCharacterCount()
    return textView.text.characters.count +  (text.characters.count - range.length) <= 65
}

Answer 3

Swift 4 for UITextView change text event UITextViewDelegate

func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {

}

Answer 4

A very elegant and neat solution exists using UITextFieldDelegate. My solution uses the concept of selectors. In a selector you tell your compiler what function/action to perform when a particular event happens. In this case - typing in textfield. Make sure that you have set the textField delegate in storyboard.

override func viewDidLoad() {
   super.viewDidLoad()
   yourTextField.addTarget(self, action: #selector(YourViewController.textFieldDidChange(_:)), for: UIControlEvents.EditingChanged)
}

@objc func textFieldDidChange(textField : UITextField){
   label.text = yourTextField.text?.count
}