Question

I have an issue with UITextField‘s validation. I want to validate the UITextField's text-length to be 5(fixed).

my code :

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    if(textField==codeTxt)
    {
         NSCharacterSet *unacceptedInput = [[NSCharacterSet characterSetWithCharactersInString:NUMBERS]invertedSet] ;

         if ([[string componentsSeparatedByCharactersInSet:unacceptedInput] count] > 1)
            return NO;

        else if ([codeTxt.text length] >= 5])
            return NO;

        else
            return YES;
    }
}

this code works fine. It validates and ignores rest of the text(more thn 5).

my problem :
When I press Delete(Backspace), nothing happens !!! the text remains the same. delete(Backspace) does not work.

what could be the problem ?

Thanks…

Answer 1

I got the solution

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

        NSCharacterSet *unacceptedInput = [[NSCharacterSet characterSetWithCharactersInString:NUMBERS]invertedSet] ;
        NSLog(@"textfield character validation method called");


        NSLog(@"%d",[codeTxt.text length]);

        if ([[string componentsSeparatedByCharactersInSet:unacceptedInput] count] > 1)
            return NO;

        else if ([codeTxt.text length] >= 5 && ![string isEqual:@""])
            return NO;

        else
            return YES;
    }
}