title: iOS - How can I set a fallback font for my custom font?
body: <p>I'm using a bold custom font for my app's navigation bar titles.</p>
  
  <p>I've also just localised my app. For languages the font doesn't support (primarily Asian languages), iOS falls back to the system default - alas, this is not a bold system default but a standard weighting not suitable for headings.</p>
  
  <p>What can I do to change this?</p>