title: how to have multiple projects acts like one app
body: <p>I am developing a big application (developed as separate projects ) that actually need to be linked in one project and access them via a menu.
  is that possible?</p>
  
  <p>What I have done so far is : </p>
  
  <p>1) I have made a project which will contain the main navigation menu. (Let's call it Master).</p>
  
  <p>2) I have imported the desired projects A, B into Master. </p>
  
  <p>although I was able to access class files of A and B from Master. But I could not make it pushed the desired view <code>viewController</code> in the project <code>A</code> it says <code>Incompatible pointer types initializing 'ViewController *' with an expression of type 'UIViewController *'</code></p>
  
  <p>I am stuck at this point. so, any advice on having multiple projects running seamlessly? </p>
  
  <p><strong>UPDATE</strong> 
  I tried to use workspaces I created a test project then included projects A, B.
  What I thought was making a button in the test project that pushes the first ViewController of Project A... that would make sense, right? 
  but Xcode gives me a red error regarding not found file.  </p>