如何在Swift 2.0中的UITextfield中仅允许某些数字集

将键盘类型设置为数字键盘

加上这个

func textField(textField: UITextField!, shouldChangeCharactersInRange range: NSRange, replacementString string: String!) -> Bool {    if let text = textField.text {        let newStr = (text as NSString) .stringByReplacingCharactersInRange(range, withString: string)        if newStr.isEmpty { return true        }        let intvalue = Int(newStr)        return (intvalue >= 0 && intvalue <= 12)    }    return true}