TextField.characther range

ViewController: UIViewController, UITextFieldDelegate {
	//create textfield view constructor
  let myTextField : UITextField = {
        let textField = UITextField()
        textField.backgroundColor = .white
        textField.translatesAutoresizingMaskIntoConstraints = false
        return textField
    }()
  
  override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = UIColor(red: 243/255, green: 243/255, blue: 243/255, alpha: 1)

        myTextField.delegate = self// must write this line
        
        setUpViews()// call func for constraint
    }
  //func for text limit
  func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        let curruntCharachterCount = textField.text?.count ?? 0
        if range.length + range.location > curruntCharachterCount{
            return false
        }
        let newLength = curruntCharachterCount + string.count - range.length
        return newLength <= 1 // set max limit of numbers
    }
  
  func setUpViews() {
    //constraint setup
        view.addSubview(enterPinTextField)
    //textField constraint
        enterPinTextField.topAnchor.constraint(equalTo: view.topAnchor, constant: 30).isActive = true
        enterPinTextField.centerXAnchor.constraint(equalTo: mainScreenView.centerXAnchor).isActive = true
        enterPinTextField.widthAnchor.constraint(equalToConstant: 150).isActive = true
    	enterPinTextField.heightAnchor.constraint(equalToConstant: 50).isActive = true
  }
}

Similar codes

18 votes508 views2 answers
Swift append element to array
Swift
3 votes365 views1 answer
Swift hide navigation bar
Swift
1 vote353 views1 answer
Use of map instad of for loop
Swift
1 vote408 views1 answer
Swift view float on keyboard show
Swift
0 vote378 views1 answer
Swift infinite while loop
Swift
0 vote323 views3 answers
Animate constraint programtically swift
Swift
1 vote373 views1 answer
Swift rotate text 90 degrees
Swift
1 vote392 views1 answer
Uicolor from hex swift
Swift
1 vote430 views3 answers
Remove back button from navigation bar swift
Swift
0 vote460 views1 answer
String to array swift
Swift