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 4

This allows only number input and you can also set character limitation

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
  let aSet = NSCharacterSet(charactersIn:"0123456789").inverted
  let compSepByCharInSet = string.components(separatedBy: aSet)
  let numberFiltered = compSepByCharInSet.joined(separator: "")

  if string == numberFiltered {
    let currentText = textField.text ?? ""
    guard let stringRange = Range(range, in: currentText) else { return false }
    let updatedText = currentText.replacingCharacters(in: stringRange, with: string)
    return updatedText.count <= 10
  } else {
    return false
  }
}