title: how is view controller connected with App Delegate
body: <p>I was trying to understand the flow of this app: <a href="https://github.com/JoelMarcey/iOS-2048" rel="nofollow noreferrer">https://github.com/JoelMarcey/iOS-2048</a></p>
  <p>but I am not sure how this app works (absolute beginner)</p>
  <p>So we have main.m which happens to be a starting point of the app?
  <a href="https://github.com/JoelMarcey/iOS-2048/blob/master/NumberTileGame/NumberTileGame/main.m" rel="nofollow noreferrer">https://github.com/JoelMarcey/iOS-2048/blob/master/NumberTileGame/NumberTileGame/main.m</a></p>
  <p>main.m imports AppDelegate.h</p>
  <p><a href="https://github.com/JoelMarcey/iOS-2048/blob/master/NumberTileGame/NumberTileGame/F3HAppDelegate.h" rel="nofollow noreferrer">https://github.com/JoelMarcey/iOS-2048/blob/master/NumberTileGame/NumberTileGame/F3HAppDelegate.h</a></p>
  <p>AppDelegate.m does not import ViewController? So how does this App show initial screen and screen thereafter?</p>
  <p>Shouldn't there be some code in AppDelegate.m? Can someone please explain me the code?</p>
  <p>Also, how do I see Main_iPhone.storyboard in my project and not in repo online?</p>
  <p><a href="https://i.stack.imgur.com/RUAHl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/RUAHl.png" alt="enter image description here" /></a></p>