UITextField - Allow only numbers and punctuation input/keypad

Question

I have tried the code below but that only allows for numbers on the keypad to be inputted. My app requires the keypad to use a period/full stop (for money transactions). The code I tried is:

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {

   NSCharacterSet *nonNumberSet = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];

     if ([string rangeOfCharacterFromSet:nonNumberSet].location != NSNotFound)
      {
         return NO;
    }
   return YES;

}

Thanks for any help.

set your text field to: [textField setKeyboardType:UIKeyboardTypeNumbersAndPunctuation]; — Mutawe, Nov 21 '13 at 13:40
@Mutawe this does not prevent the user from changing to the `ABC` keyboard. — DevC, Nov 21 '13 at 13:45
Answered a [similar question here.](http://stackoverflow.com/a/12944946/868193) — Beltalowda, Apr 24 '14 at 06:00

score 44 · Accepted Answer · edited Dec 09 '17 at 04:53

44

Try this

Make a macro

#define ACCEPTABLE_CHARACTERS @"0123456789."

And use it

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string  {

    if (textField==textFieldAmount)
    {
        NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:ACCEPTABLE_CHARACTERS] invertedSet];

        NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];

        return [string isEqualToString:filtered];
    }
    return YES;
}

edited Dec 09 '17 at 04:53

Ogre Codes

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answered Nov 21 '13 at 13:39

Kalpesh

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Thanks, whats `textFieldAmount`? – DevC Nov 21 '13 at 13:44
I have mulitiple textfield thats y i am checking. – Kalpesh Nov 21 '13 at 13:45

Charlton Provatas · Answer 2 · 2016-11-20T21:28:02.663

3

In Swift 3:

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    let allowedCharacters = "0123456789!@#$%^&*()_+~:{}|\"?><\\`,./;'[]=-"
    return allowedCharacters.contains(string) || range.length == 1
}

edited Nov 20 '16 at 21:28

answered Oct 28 '16 at 19:36

Charlton Provatas

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@SPatel Also the question is "allow only punctuation and numbers". `.` is punctuation – Charlton Provatas Nov 09 '17 at 16:35

score 2 · Answer 3 · answered Nov 21 '13 at 13:38

2

Just use

[textField setKeyboardType:UIKeyboardTypeNumbersAndPunctuation];

after creating your textfield.

answered Nov 21 '13 at 13:38

LifeIsHealthy

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this does not prevent the user from changing to the `ABC` keyboard. – DevC Nov 21 '13 at 13:44
@Gman Well I guess there is no standard keyboard that fully meets your requirements... I guess you'd have to make your own input view for that purpose though that seems like an overkill to me. – LifeIsHealthy Nov 21 '13 at 13:48
It also doesn't defend from pasting incorrect data into a textField – FreeNickname Sep 30 '15 at 08:22

score 2 · Answer 4 · answered Nov 21 '13 at 13:39

2

How about a custom character set? Something like this:

NSCharacterSet *testChars = [NSCharacterSet characterSetWithCharactersInString:@"0123456789+*#-() "];

Because setting the keyboard type is pretty useless on iPad...

answered Nov 21 '13 at 13:39

Laszlo

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UITextField - Allow only numbers and punctuation input/keypad

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