Question

Hi just wondering if it is possible, as the user is entering a string of numbers to dynamically add a hyphen every 5th character of the string…

any help would be greatly appreciated.

Answer 1

Try this code.

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

    NSString *separator = @"-";
    int seperatorInterval = 5;
    NSString *originalString = [textField.text stringByReplacingOccurrencesOfString:separator withString:@""];

    if (![originalString isEqualToString:@""] && ![string isEqualToString:@""]) {

        NSString *lastChar = [textField.text substringFromIndex:[textField.text length] - 1];
        int modulus = [originalString length] % seperatorInterval;

        if (![lastChar isEqualToString:separator] && modulus == 0) {

            textField.text = [textField.text stringByAppendingString:separator];
        }
    }

    return YES;
}