title: Convert self.window.rootViewController = colorTouchVC to message sending form?
body: <p>I'm new to Objective-C, so far to my understanding, the <strong>dot form</strong> and <strong>message sending</strong> form can be converted vice versa. So How to convert the following expression to <strong>message sending form</strong></p>
  
  <pre><code>self.window.rootViewController = colorTouchVC;
  </code></pre>
  
  <p>My version:</p>
  
  <pre><code> [self setWindow:[self setRootViewController: colorTouchVC]];
  </code></pre>