title: LaunchServices: invalidationHandler called - iOS 8 share sheet
body: <p>Seeing this error message in the logs, though not consistently, around the time that I use <code>SLComposeViewController</code> to open a Twitter or Facebook share sheet. I am not using any new iOS 8 API, just testing existing code on iOS 8. I see others have had this problem and even seen crashes when using other modal view controllers from the Cocoa Touch SDK.</p>
  
  <blockquote>
    <p>LaunchServices: invalidationHandler called</p>
  </blockquote>
  
  <p>Are there new precautions to take with <code>SLComposeViewController</code> and <code>UIActivityViewController</code> in iOS 8? Something else to consider?</p>