title: Apple San Francisco font face in Flutter
body: <p>I want to implement an app using Flutter, and I want to use the system default font faces for Android and iOS.</p>
  <p>The design I got to implement, has multiple font weights and I can't seem to find how to use other font weights for iOS devices (the font face being San Francisco), other than .Regular and .Bold. Is there a way to use multiple font weights and get them to be displayed when viewed on iOS devices?</p>
  <p>Thanks!</p>