iOS 强制 UITextfield 使用系统数字键盘

Question

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Answer 1

您可以使用 UITextField 委托(delegate)来限制仅输入数字:

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

  let numbersOnly = NSCharacterSet(charactersInString:"0123456789").invertedSet
  let compSepByCharInSet = string.componentsSeparatedByCharactersInSet(numbersOnly)
  let numberFiltered = compSepByCharInSet.joinWithSeparator("")
  return string == numberFiltered

}