Question

I am using textfield in my application and I want to restrict user typing only 15 characters in the textfield. After that he/she should not be able to type in the textfield.

How can I set this kind of functionality?

Answer 1

There’s a bit of a trick to this, you need to calculate what the new string will be before you can test whether to allow or deny the change

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string];

    if ([newString length] > 15) {
        return FALSE;
    } else {
        return TRUE;
    }
}