title: How to custom transition from other app to my app
body: <p>My app share a interesting url to twitter or wechat,and return to my app.   </p>
  
  <p>Before my app call the <code>applicationWillEnterForeground</code>,the system will show a transition from twitter or wechat to my app.</p>
  
  <p>Default,the transition show the LaunchScreen.storyboard snapshot. </p>
  
  <p>How to custom the transition?Can I change the transition snapshot to my favorite image?</p>