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

Here's how you could do it in Swift 3/4.

First, make sure you've got your textField's delegate set in `viewDidLoad`.

yourTextField.delegate = self

Then, implement `shouldChangeCharactersIn`:


extension YourViewController: UITextFieldDelegate {
func textField(_ textFieldToChange: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
// limit to 4 characters
let characterCountLimit = 4

// We need to figure out how many characters would be in the string after the change happens
let startingLength = textFieldToChange.text?.characters.count ?? 0
let lengthToAdd = string.characters.count
let lengthToReplace = range.length

let newLength = startingLength + lengthToAdd - lengthToReplace

return newLength <= characterCountLimit
}
}

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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
}

This will only allow your textfield input 14 char

class ViewController: UIViewController,UITextFieldDelegate {

@IBOutlet weak var textfield: UITextField!
@IBOutlet weak var label: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
self.label.text = "14"
self.textfield.delegate = self
}
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
let newLength = count(textField.text.utf16) + count(string.utf16) - range.length
if(newLength <= 14){
self.label.text = "\(14 - newLength)"
return true
}else{
return false
}
}
}
And Screenshot

![enter image description here][1]


[1]: