title: Flutter: Array of AnimationController
body: <p>How can I create a list of AnimationController?</p>
  <p>I found <a href="https://stackoverflow.com/questions/58433524/flutter-array-of-texteditingcontroller">Flutter: Array of TextEditingController</a> which shows how to create a list of texteditingcontroller, but with the AnimationController there's a required vsync and I haven't figured out how to get that to work.  Any ideas?</p>