How to add increase /configure weight/boldness (FontWeight) of an Icon in Flutter

Question

I have an Icon (Back Icon to be Specific) in My Flutter App. It Looks Lighter. I Want to Make It Bold/Increase weight for Some Reason.

Container(
    child: Icon(
        Icons.arrow_back,
        color: Color(0xffffffff),
    ),
    padding: EdgeInsets.all(10.0),
    margin: EdgeInsets.fromLTRB(0, 10.0, 0, 0.0),
    decoration: BoxDecoration(
        color: Color(0xff03b673),
        borderRadius: BorderRadius.all(Radius.circular(100.0)),
    ),
)

Can't Find Any Thread/Documentation Regarding it.

Answer 1

icon size

Container(
child: Icon(
    Icons.arrow_back,
    color: Color(0xffffffff),
    size: 24.0
 ),
 padding: EdgeInsets.all(10.0),
 margin: EdgeInsets.fromLTRB(0, 10.0, 0, 0.0),
 decoration: BoxDecoration(
    color: Color(0xff03b673),
    borderRadius: BorderRadius.all(Radius.circular(100.0)),
 ),
)

At the moment,I think there is no fontWeight property on icons. you may import custom icon from fluttericon.com and when you import it under fonts you can set the font weight like this in pubspec.yaml:

flutter:
 fonts:
 - family: MyIcon
  fonts:
    - asset: lib/fonts/iconfont.ttf
      weight: 400

For complete steps follow this nice article: https://developpaper.com/flutter-taste-1-3-step-use-custom-icon/

Answer 2

Question is old, but I hope it will help someone.

Before:

Icon(
  CupertinoIcons.exclamationmark_circle,
  color: Colors.red,
  size: 16.0,
)

After (with FontWeight):

Text(
  String.fromCharCode(CupertinoIcons.exclamationmark_circle.codePoint),
  style: TextStyle(
    inherit: false,
    color: Colors.red,
    fontSize: 16.0,
    fontWeight: FontWeight.w700,
    fontFamily: CupertinoIcons.exclamationmark_circle.fontFamily,
    package: CupertinoIcons.exclamationmark_circle.fontPackage,
  ),
)

Of course, your icons should support different weights. Icon from my example supports only 2 weights:

1. thin <= FontWeight.w500
2. thick >= FontWeight.w600