iPhone Force Textbox Input to Upper Case

Question

How do I force characters input into a textbox on the iPhone to upper case?

Answer 1

This is my code, when i have 6 textFields

Hope you will get the point

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    if (textField==self.textField6) {
        self.textField6.text = [textField.text stringByReplacingCharactersInRange:range withString:[string uppercaseString]];
        return NO;
    }
    return YES;
}