title: Presenting a modal view controller from OpenURL
body: <p>I am implementing a custom URL scheme in my application and can successfully launch the application from another, and display an alert.</p>
  
  <p>Instead, I would like to present a modal view controller.</p>
  
  <p>From the APPDelegate, how can I display a modal view controller in openURL? Given that the application may be already running, and in a variety of states? For example, what if a modal controller is already being displayed at the time that the URL is sent in?</p>