title: Changing UILabel with a button
body: <p>So, I have this popover who can be activated by four viewcontrollers.
  Inside this popover, I click on a button and this button changes one UILabel which is in the viewcontroller which activated the popover.</p>
  
  <p>But, the problem is: depending on which viewcontroller actives the popover, the text is different.</p>
  
  <p>My question: how can I set one if clause to know from which viewcontroller activated the popover?</p>
  
  <p>Here is the code that changes the UILabel, where I have to implement the if clause:</p>
  
  <pre><code>- (void) escolheu1:(id)sender {
      [delegate menuController:self 
           hasPressedSomething:
              [NSString stringWithFormat:@"They are panels composed by odd numbers of layers, which are crossed with each other in order to obtain more strength."]];
  }
  </code></pre>
  
  <p>I guess I gotta use isKindOfClass method, maybe not, I don't know.</p>
  
  <p>Can you guys help, please?</p>
  
  <p>Thank you!</p>