Question

I am using UITextField and i want that should take character in the format of xx-xx-xxx only numbers.

any help ?

Answer 1

Try below it will work

Objective-C

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    int groupingSize = 2;
    if([string length] == 0) {
        groupingSize = 4;
    }
    NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init] ;
    NSString *separator = @"-";
    [formatter setGroupingSeparator:separator];
    [formatter setGroupingSize:groupingSize];
    [formatter setUsesGroupingSeparator:YES];
    [formatter setSecondaryGroupingSize:2];
    if (![string  isEqual: @""] && (textField.text != nil && textField.text.length > 0)) {
        NSString *num = textField.text;
        num = [num stringByReplacingOccurrencesOfString:separator withString:@""];
        NSString *str = [formatter stringFromNumber:[NSNumber numberWithDouble:[num doubleValue]]];
        textField.text = str;
    }
    return YES;
}

Swift-3

extension ViewController: UITextFieldDelegate {

    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        var groupSize = 2
        let separator = "-"
        if string.characters.count == 0 {
            groupSize = 4
        }
        let formatter = NumberFormatter()
        formatter.groupingSeparator = separator
        formatter.groupingSize = groupSize
        formatter.usesGroupingSeparator = true
        formatter.secondaryGroupingSize = 2
        if var number = textField.text, string != "" {
            number = number.replacingOccurrences(of: separator, with: "")
            if let doubleVal = Double(number) {
                let requiredString = formatter.string(from: NSNumber.init(value: doubleVal))
                textField.text = requiredString
            }

        }
        return true
    }
}