Question

I am getting Phone card number form user in UI text field. The format of number is like

123-4567-890

I want that as user types 123 automatically – is inserted in UITextField same after 4567 – and so on.

I Did it using following code in UITextField delegate method:

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string;
{
       NSLog(@"***** %d",textField.text.length);


             if(textField.text.length == 3) 

             {
                 textField.text  = [textField.text  stringByAppendingString:@"-"];
             }  

       return YES;
}

But the Problem raised while clear the text, When we start clearing.

Last 3 digits 890 clears and then – addded, we cleared it and again added and soooo on so clearing stop at

We clear all the text at a time using

textField.clearButtonMode = UITextFieldViewModeWhileEditing; //To clear all text at a time

But our requirement is user must delete one character at a time.

How to achieve it?

Answer 1

During clearing replacementString should be empty @"". So replacement string should be checked also in addition to length check. Like this:

if (textField.text.length == 3 && ![string isEqualToString:@""]) {
    // append -
}