Why do I have a question mark instead of a material design icon in my iOS simulator?

Question

I want to use a material design icon in my Flutter app. But I get a strange behaviour of my iOs simulator - I have a question mark in a square instead of the icon. In Android emulator the icon looks fine.

Answer 1

You should check your pubspec.yaml file:

flutter:
  uses-material-design: true

If contains this line. The icons are from material design, if without this line, these icons are all replaced by a question mark icon.