文本边框样式:

Stack(
  children: <Widget>[
    // Stroked text as border.
    Text(
      'Greetings, planet!',
      style: TextStyle(
        fontSize: 40,
        foreground: Paint()
          ..style = PaintingStyle.stroke
          ..strokeWidth = 6
          ..color = Colors.blue[700]!,
      ),
    ),
    // Solid text as fill.
    Text(
      'Greetings, planet!',
      style: TextStyle(
        fontSize: 40,
        color: Colors.grey[300],
      ),
    ),
  ],
)

圆角/边缘与底部阴影

Container(
 // child it's depend on your requirement
  child: const Center(
    child: Text(
      'This is your Container',
    ),
  ),
  decoration: BoxDecoration(
    borderRadius: BorderRadius.circular(10),
    color: Colors.white,
  boxShadow: <BoxShadow>[
       // shadow color and radius
        BoxShadow(
            color: Colors.black54,
            blurRadius: 15.0,
            offset: Offset(0.0, 0.75)
        )
      ],
  ),
  // according your height ex. 50
  height: 50,
);

用容器包装小部件

Container(
        margin: const EdgeInsets.all(30.0),
        padding: const EdgeInsets.all(10.0),
        decoration: BoxDecoration(border: Border.all(
        color: Colors.black,
        width: 1,
      ),
    ), 
        child: Text(
          "text",
          style: TextStyle(fontSize: 30.0),
        ),
      );

如果有人想要一个概述/边界文本或应用多个边界。

你可以试试这个:

https://pub.dev/packages/outlined_text

DEMO

总结

我已经尝试总结了在BoxDecoration中使用边框时所有重要的可能性。

以下解释边界的结果:

---

解释

基本

  Container(
    decoration: BoxDecoration(border: Border.all()),
    child: const Text("Text"),
 ),    

---

BorderColor, width和strokeAlign

Container(
   decoration: BoxDecoration(
   border: Border.all(
       width: 4,
       color: Colors.green,
       strokeAlign: BorderSide.strokeAlignCenter)),
   child: const Text("Text"),
),

---

只在特定的一侧划定边界

      Row(
        mainAxisAlignment: MainAxisAlignment.spaceAround,
        children: [
          Container(
            decoration: const BoxDecoration(
                border: Border(top: BorderSide(width: 2))),
            child: const Text("Text"),
          ),
          Container(
            decoration: const BoxDecoration(
                border: Border(bottom: BorderSide(width: 2))),
            child: const Text("Text"),
          ),
          Container(
            decoration: const BoxDecoration(
                border: Border(
                    top: BorderSide(width: 2),
                    bottom: BorderSide(width: 4))),
            child: const Text("Text"),
          ),
        ],
      ),

---

不同的形状

      Row(
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        children: [
          Container(
            padding: const EdgeInsets.all(10),
            decoration: BoxDecoration(
                border: Border.all(),
                shape: BoxShape.circle),
            child: const Text("Text"),
          ),
          Container(
            padding: const EdgeInsets.all(10),
            decoration: BoxDecoration(
              border: Border.all(),
              borderRadius: BorderRadius.circular(10),
            ),
            child: const Text("Text"),
          ),
        ],
      ),

---

弯曲边界半径

    Row(
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        children: [
          Container(
            padding: const EdgeInsets.all(10),
            decoration: BoxDecoration(
                border: Border.all(),
                borderRadius: const BorderRadius.horizontal(
                    left: Radius.circular(5), right: Radius.circular(20))
                ),
            child: const Text("Text"),
          ),
          Container(
            padding: const EdgeInsets.all(10),
            decoration: BoxDecoration(
                border: Border.all(),
                borderRadius: const BorderRadius.only(
                    topLeft: Radius.circular(10),
                    bottomRight: Radius.circular(20))),
            child: const Text("Text"),
          ),
        ],
      ),

在这里，由于Text小部件没有允许我们定义边框的属性，我们应该用一个允许我们定义边框的小部件来包装它。 有几种解决方案。 但是最好的解决方案是在容器小部件中使用BoxDecoration。

为什么选择使用BoxDecoration?

因为BoxDecoration提供了更多的定制，比如定义:

首先，边界和也定义:

边框颜色 边框宽度 边界半径 形状 还有更多……

一个例子:

   Container(
     child:Text(' Hello Word '),
     decoration: BoxDecoration(
          color: Colors.yellow,
          border: Border.all(
                color: Colors.red ,
                width: 2.0 ,
              ),
          borderRadius: BorderRadius.circular(15),
            ),
          ),

输出: