1 // MARK: - UITextFieldDelegate
2 func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
3 guard string == "." || string == "0" else {
4 //限制输入个数{0,2},0-2
5 /*
6 let newString = (textField.text! as NSString).replacingCharacters(in: range, with: string)
7
8 //纯整数，限制只有6位{0,6}。如果是小数，就小数点前6后8位{0,8}
9 //let expression = "^[0-9]{0,6}?$*((\\.|,)[0-9]{0,8})?$"
10 let expression = "^[0-9]*((\\.|,)[0-9]{0,2})?$"
11 let regex = try! NSRegularExpression(pattern: expression, options: NSRegularExpression.Options.allowCommentsAndWhitespace)
12 let numberOfMatches = regex.numberOfMatches(in: newString, options:.reportProgress, range: NSMakeRange(0, (newString as NSString).length))
13 return numberOfMatches != 0
14 */
15
16 //无限制
17 return true
18 }
19
20 guard let text = textField.text else { return true }
21 if text.count == 0 {
22 textField.text = "0."
23 return false
24 }
25
26 if text.range(of: ".") != nil && string == "." {
27 return false
28 }
29
30 return true
31 }
