flutter TextSpan example (apply font style)

cf. flutter project에 font 적용하러가기 (Go to apply the font in flutter)

1. before code

@override
Widget build(BuildContext context) {
  return AnnotatedRegion<SystemUiOverlayStyle>(
    value: SystemUiOverlayStyle.dark,
    child: Scaffold(
      body: _buildBody(),
    ),
  );
}

Widget _buildBody() {
  return Stack(
    alignment: Alignment.centerRight,
    children: [
      Container(
        decoration: BoxDecoration(
          image: DecorationImage(
            image: AssetImage(
              'assets/images/onboarding/tutorial/background@3x.png',
            ),
            fit: BoxFit.fill,
          ),
        ),
        width: double.infinity,
        height: double.infinity,
        child: Text(
          '스킨로그는\n'
          '여러분의 피부기록을\n'
          '도와주는 앱이에요.',
        ),
      ),
      SizedBox(
        width: CommonsSize.deviceWidth * 0.8,
        child: Image.asset(
          'assets/images/onboarding/tutorial/onboarding1@3x.png',
        ),
      )
    ],
  );
}

2. used textspan code

final _fontStyle = TextStyle(
  fontSize: 24,
  fontWeight: FontWeight.w300,
  color: Colors.white,
  letterSpacing: 0,
  height: 1.6,
);

@override
Widget build(BuildContext context) {
  return AnnotatedRegion<SystemUiOverlayStyle>(
    value: SystemUiOverlayStyle.dark,
    child: Scaffold(
      body: _buildBody(),
    ),
  );
}

Widget _buildBody() {
  return Stack(
    alignment: Alignment.centerRight,
    children: [
      Container(
        decoration: BoxDecoration(
          image: DecorationImage(
            image: AssetImage(
              'assets/images/onboarding/tutorial/background@3x.png',
            ),
            fit: BoxFit.fill,
          ),
        ),
        width: double.infinity,
        height: double.infinity,
        alignment: Alignment.bottomCenter,
        child: Column(
          mainAxisAlignment: MainAxisAlignment.end,
          children: [
            Container(
              width: double.infinity,
              margin: EdgeInsets.only(
                left: CandySize.horizontalBottomPadding,
              ),
              child: RichText(
                text: TextSpan(
                  style: _fontStyle,
                  children: [
                    TextSpan(
                      text: '스킨로그',
                      style: TextStyle(
                        fontWeight: FontWeight.w800,
                      ),
                    ),
                    TextSpan(
                      text: '는\n'
                          '여러분의 ',
                    ),
                    TextSpan(
                      text: '피부기록',
                      style: TextStyle(
                        fontWeight: FontWeight.w800,
                      ),
                    ),
                    TextSpan(
                      text: '을\n'
                          '도와주는 앱이에요.',
                    ),
                  ],
                ),
              ),
            ),
          ],
        ),
      ),
      SizedBox(
        width: CommonsSize.deviceWidth * 0.8,
        child: Image.asset(
          'assets/images/onboarding/tutorial/onboarding1@3x.png',
        ),
      )
    ],
  );
}