Objective-C : validating text field with number

Question

I'm new to iOS development. I want to know about how we can validate text field if it contains number with some specific range, say 10 for contact number ? Is there any predefined function available ?

Thank you.

possible duplicate http://stackoverflow.com/questions/21669736/validation-for-phone-number-in-ios — Sujay, May 14 '15 at 08:04

score 1 · Accepted Answer · answered May 14 '15 at 07:43

1

+ (BOOL) validatePassword:(NSString *)passWord
{
   NSString *passWordRegex = @"^[a-zA-Z0-9]{6,20}+$";
   NSPredicate *passWordPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",passWordRegex];
   return [passWordPredicate evaluateWithObject:passWord];
}

answered May 14 '15 at 07:43

menextu

77
3

Thank you @menextu. I would like to know how this regex working here to check its in range of 10 characters ? Should I use NSString length/count to do so ? – iAkshay May 15 '15 at 15:16

score 0 · Answer 2 · edited May 14 '15 at 07:48

0

To have textfield to accept only numbers and only till 10 digit length you can use this function.

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string  {
   NSString *acceptedCharsters = @"0123456789";

 NSUInteger newLength = [textField.text length] + [string length] - range.length;
    return (newLength > 10) ? NO : YES;

NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:acceptedCharsters] invertedSet];

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

    return [string isEqualToString:filtered];


return YES;
}

edited May 14 '15 at 07:48

Anbu.Karthik

82,064
23
174
143

answered May 14 '15 at 07:45

Shruti

1,849
1
13
21

@shurthi -- in text filed I paste the some char means more than 10 char -- your condition will statisfy – Anbu.Karthik May 14 '15 at 07:49
(newLength=10 ? NO : YES ) ... for exact 10 chars. Thank you @shruti – iAkshay May 15 '15 at 15:23

Objective-C : validating text field with number

2 Answers2