title: I got "unrecognized selector sent to instance" when trying to hide keyboard
body: <p>I have a textfield on cell on UITableView. In the UITableViewControoler, which I set it to be the delegate for textfield, I put the below method to hide keyboard</p>
  
  <pre><code>- (BOOL)textFieldShouldReturn:(UITextField *)theTextField {
  
  
      if (theTextField == self.nameTextField) {
  
         [theTextField resignFirstResponder];
  
      }
      return YES;
  }
  </code></pre>
  
  <p>I could see that this method get invoked, but it crash when it reach resignFirstResponder with error "unrecognized selector sent to instance". i don't know why?</p>