RichText

参考：

• RichText
• TextSpan

RichText表示的是富文本，使用不同的样式来显示文本，使用TextSpan对象来描述要显示的文本

Text displayed in a RichText widget must be explicitly styled. When picking which style to use, consider using DefaultTextStyle.of the current BuildContext to provide defaults. For more details on how to style text in a RichText widget, see the documentation for TextStyle.
RichText中的text需要显式指定样式。可考虑使用 BuildContext的DefaultTextStyle来提供默认样式

TextSpan构造方法

TextSpan({String text List<InlineSpan> children, TextStyle style, GestureRecognizer recognizer, String semanticsLabel })

如下的例子：

class ContainerWithBoxDecorationWidget extends StatelessWidget {

  const ContainerWithBoxDecorationWidget({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Column(
      children: <Widget>[
        Container(
          height: 100.0,
          decoration: BoxDecoration(
            borderRadius: BorderRadius.only(
              bottomLeft: Radius.circular(100.0),
              bottomRight: Radius.circular(10.0),
            ),
            gradient: LinearGradient(
              begin: Alignment.topCenter,
              end: Alignment.bottomCenter,
              colors: [
                Colors.white,
                Colors.lightGreen.shade500,
              ],
            ),
            boxShadow: [
              BoxShadow(
                color: Colors.grey,
                blurRadius: 10.0,
                offset: Offset(0.0, 10.0),
              )
            ],
          ),
          child: Center(
            child: RichText(
              text: TextSpan(
                text: 'Flutter World',
                style: TextStyle(
                  fontSize: 24.0,
                  color: Colors.deepPurple,
                  decoration: TextDecoration.underline,
                  decorationColor: Colors.deepPurpleAccent,
                  decorationStyle: TextDecorationStyle.dotted,
                  fontStyle: FontStyle.italic,
                  fontWeight: FontWeight.normal,
                ),
                children: [
                  TextSpan(
                    text: ' for',
                  ),
                  TextSpan(
                    text: ' Mobile',
                    style: TextStyle(
                      color: Colors.deepOrange,
                      fontWeight: FontWeight.bold,
                      fontStyle: FontStyle.normal
                    )
                  ),
                ]
              ),
            ),
          ),
        ),
      ],
    );
  }
}

效果如下：