UITextField Should accept number only values

Question

I have UITexfields i want that it should accept only number other shows alert that enter a numeric value. I want that motionSicknessTextFiled should only accept number

Answer 1

Swift

class ExampleVC: UIViewController {

    let numbers = "0123456789";

    override func viewDidLoad() {
        super.viewDidLoad()

        let textfield = UITextField(frame: CGRectMake(20, 100, 300, 44))
        //make some customization, if you want
        self.view.addSubview(textfield)

        textfield.delegate = self;
    }
}

extension ExampleVC: UITextFieldDelegate {

    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        return string.characters.count > 0 ? numbers.contains(string) : true
    }
}