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

Here is Swift solution:

In viewDidLoad set the delegate:

_yourTextField.delegate = self

let _acceptableCharacters = "0123456789."

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

    if (string.characters.count == 0) {
        return true
    }

    if (textField == self._yourTextField) {
        let cs = NSCharacterSet(charactersInString: self._acceptableCharacters)
        let filtered = string.componentsSeparatedByCharactersInSet(cs).filter {  !$0.isEmpty }
        let str = filtered.joinWithSeparator("")

        return (string != str)
    }

    return true
}