title: add an Action Button in the currentView
body: <p>I'm beginner in objective-c and i don't find a solution on internet about my problem.</p>
  
  <p>I'm trying to add a new action to a Button and it doesn't work.
  Indeed i have more views in all the Views excepted the first View, i can't add this action to a button.
  I work with Interface Builder to design my graphical View.</p>
  
  <p>And if i want to add action to a button of the 2,3rd .. View by linking the button to ViewController.h, i can't
  It's the same if i want to link the button to UIViewController.h, I have an error message which tell:
  <strong>Could not insert new action connection: No @implementation found for the class "UIViewController"</strong></p>
  
  <p>i want to do that for example, if a user click on this button i will change the background color of the current View.</p>
  
  <p>Another Question:</p>
  
  <p>I don't know how to know what the current view is, for example if i want to change the color of the current view what i have to do ?</p>
  
  <p>Thanks for you help. </p>