How to set the maximum number of value during typing

Question

I have a UITextField, I'd like to restrict the maximum allowed input value in the field to be 1000 .eg (1-1000),If the value in the textfield exceeds above 1000 the textfield should not get the value as input.I have tried the following

func textField(_ textField: UITextField,shouldChangeCharactersIn range: NSRange,replacementString string: String) -> Bool
{
    var newString: String = textField.text.replacingCharacters(in: range, with: string)
    var characterSet = CharacterSet(charactersIn: "0123456789,.").inverted
    if (newString as NSString).rangeOfCharacter(from: characterSet).location != NSNotFound {
        return false
    }
    return Double(newString) ?? 0.0 < 1000
}

see this https://stackoverflow.com/questions/31363216/set-the-maximum-character-length-of-a-uitextfield-in-swift — Anbu.Karthik, Oct 09 '17 at 11:18
ya your condition is statisfy only = 999 chars and if it is exceed is returns false — Anbu.Karthik, Oct 09 '17 at 11:24
@Anbu.Karthik the text field should get values from 1- 1000 , above 1000 is not accepted (eg-1001) should not be accepted — jerfin, Oct 09 '17 at 11:26
@Anbu.Karthik the answer I have posted is correct ? or the link you have mentioned is correct? — jerfin, Oct 09 '17 at 11:28
both are correct, by default your condition > 1001 the textfield should not allow it returns false — Anbu.Karthik, Oct 09 '17 at 11:29
https://stackoverflow.com/questions/29782982/how-to-input-currency-format-on-a-text-field-from-right-to-left-using-swift/29783546?s=1|17.2382#29783546 — Leo Dabus, Oct 09 '17 at 11:35
@Anbu.Karthik I don't know where I am wrong but still I am unable to achieve what I am expecting, Can you please attach a working code for swift 4? — jerfin, Oct 09 '17 at 12:02

score 0 · Answer 1 · answered Oct 09 '17 at 11:35

0

Try this. Hope this will help

 func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        guard let text = textField.text else { return true }
        let newLength = text.characters.count + string.characters.count - range.length
        return newLength <= 1001 
    }

answered Oct 09 '17 at 11:35

Nishant Bhindi

2,242
8
21

OP wants to limit the value not the number of characters – Leo Dabus Oct 09 '17 at 11:36

score 0 · Answer 2 · answered Oct 09 '17 at 11:36

0

Try extracting the integer value from the textField and check if it is below 1000.

- (BOOL)textFieldShouldReturn:(UITextField *)textField
  {
      NSInteger inte = [textField.text intValue];
      if (inte < 1000 && inte > 0)
         return NO;
      else 
         return YES;
  }

answered Oct 09 '17 at 11:36

Bahnny Das

1
1

OP is working with Double not Integers and the question is tagged as Swift. – Leo Dabus Oct 09 '17 at 11:37
https://stackoverflow.com/questions/26582453/how-to-set-minimum-and-maximum-limit-to-uitextfield You can check this link – Bahnny Das Oct 09 '17 at 11:37
It doesn't make any difference – Leo Dabus Oct 09 '17 at 11:37

How to set the maximum number of value during typing

2 Answers2