只要它是矩形虚线边框，你现在可以使用我上传到Pub的dotted_border包。

用法

DottedBorder(
  color: Colors.black,
  strokeWidth: 1,
  child: FlutterLogo(size: 148),
)

使用此组件：

import 'dart:math';

import 'package:flutter/material.dart';

class CircularBorder extends StatelessWidget {

  final Color color;
  final double size;
  final double width;
  final Widget icon;

  const CircularBorder({Key key, this.color = Colors.blue, this.size = 70, this.width = 7.0, this.icon}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      height: size,
      width: size,
      alignment: Alignment.center,
      child: Stack(
        alignment: Alignment.center,
        children: <Widget>[
          icon == null ? Container() : icon,
          CustomPaint(
            size: Size(size, size),
            foregroundPainter: new MyPainter(
                completeColor: color,
                width: width),
          ),
        ],
      ),
    );
  }
}

class MyPainter extends CustomPainter {
  Color lineColor =  Colors.transparent;
  Color completeColor;
  double width;
  MyPainter(
      { this.completeColor, this.width});
  @override
  void paint(Canvas canvas, Size size) {
    Paint complete = new Paint()
      ..color = completeColor
      ..strokeCap = StrokeCap.round
      ..style = PaintingStyle.stroke
      ..strokeWidth = width;

    Offset center = new Offset(size.width / 2, size.height / 2);
    double radius = min(size.width / 2, size.height / 2);
    var percent = (size.width *0.001) / 2;

    double arcAngle = 2 * pi * percent;
    print("$radius - radius");
    print("$arcAngle - arcAngle");
    print("${radius / arcAngle} - divider");

    for (var i = 0; i < 8; i++) {
      var init = (-pi / 2)*(i/2);
      
      canvas.drawArc(new Rect.fromCircle(center: center, radius: radius),
          init, arcAngle, false, complete);
    }

 
  }

  @override
  bool shouldRepaint(CustomPainter oldDelegate) {
    return true;
  }
}

使用：

CircularBorder(
          width: 6,
          size: 55,
          color: Colors.grey,
          icon: Icon(Icons.access_alarm, color: Colors.grey),
        ),

对于使用this的圆角，可以使用

CardRadius = 10.0;

return DottedBorder(
      color: Colors.black,
      strokeWidth: 3,
      radius: Radius.circular(CardRadius),
      dashPattern: [10, 5],
      customPath: (size) {
        return Path()
          ..moveTo(CardRadius, 0)
          ..lineTo(size.width - CardRadius, 0)
          ..arcToPoint(Offset(size.width, CardRadius), radius: Radius.circular(CardRadius))
          ..lineTo(size.width, size.height - CardRadius)
          ..arcToPoint(Offset(size.width - CardRadius, size.height), radius: Radius.circular(CardRadius))
          ..lineTo(CardRadius, size.height)
          ..arcToPoint(Offset(0, size.height - CardRadius), radius: Radius.circular(CardRadius))
          ..lineTo(0, CardRadius)
          ..arcToPoint(Offset(CardRadius, 0), radius: Radius.circular(CardRadius));
      },
      child: Container(...)
    }

这就是它的样子

我正在使用dotted_border插件-

import 'package:flutter/material.dart';

import 'package:dotted_border/dotted_border.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
          appBar: AppBar(
            title: Text('Dotted Border'),
          ),
          body: SafeArea(
            child: Center(
              child: Padding(
                padding: const EdgeInsets.all(8.0),
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  crossAxisAlignment: CrossAxisAlignment.center,
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: <Widget>[
                    container1,
                    Spacer(),
                    container2,
                    Spacer(),
                    container3,
                    Spacer(),
                    container4,
                  ],
                ),
              ),
            ),
          )),
    );
  }

  Widget get container1 {
    return DottedBorder(
      padding: EdgeInsets.all(4),
      dashPattern: [9, 5],
      child: Container(
        height: 110,
        width: double.maxFinite,
        decoration: BoxDecoration(
          color: Color(0xff994444),
        ),
      ),
    );
  }

  Widget get container2 {
    return DottedBorder(
      padding: EdgeInsets.all(8),
      dashPattern: [6],
      borderType: BorderType.Circle,
      child: Container(
        height: 210,
        width: double.maxFinite,
        decoration: ShapeDecoration(
          shape: CircleBorder(),
          color: Color(0xff444499),
        ),
      ),
    );
  }

  Widget get container3 {
    return DottedBorder(
      padding: EdgeInsets.all(4),
      borderType: BorderType.RRect,
      radius: Radius.circular(20),
      child: Container(
        height: 120,
        width: double.maxFinite,
        decoration: ShapeDecoration(
          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
          color: Color(0xff994444),
        ),
      ),
    );
  }

  Widget get container4 {
    return DottedBorder(
      borderType: BorderType.Oval,
      dashPattern: [8,4,2,4],
      child: Container(
        height: 180,
        width: double.maxFinite,
        decoration: ShapeDecoration(
          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
          color: Color(0x22888888),
        ),
      ),
    );
  }
}

你可以使用dashPattern，这个属性允许你通过传入一个双精度数组来指定Dash序列。

DottedBorder(
    dashPattern: [6, 3, 2, 3], 
    child: ...
);

该代码给出了宽度为6、空格为3、宽度为2、空格为3、…的虚线序列。而且还在继续
要在屏幕上显示虚线，请使用

DottedBorder(
  color: Color(0xFFE9EBF5),
  strokeWidth: 1,
  radius: Radius.circular(10),
  dashPattern: [5, 5],
  customPath: (size) {
    return Path()
      ..moveTo(0, 10)
      ..lineTo(size.width, 10);
  },
  child: Container(),
),

https://pub.dev/packages/mobkit_dashed_border您可以使用此软件包。此包不使用小部件。创建一个新的边框类型。你可以在任何地方使用它。

Container(
      margin: EdgeInsets.symmetric(horizontal: 10, vertical: 20),
      height: 16,
      width: MediaQuery.of(context).size.width,
      decoration: BoxDecoration(
        color: ThemeConstants.blueGreyDivider,
        borderRadius: BorderRadius.circular(100),
      ),
      child: SingleChildScrollView(
        physics: NeverScrollableScrollPhysics(),
        scrollDirection: Axis.horizontal,
        child: Row(
          children: List.generate(
            MediaQuery.of(context).size.width ~/ (10 + 5),
            (_) => Container(
              width: 10,
              height: 2,
              color: Colors.white,
              margin: EdgeInsets.only(left: 10 / 2, right: 5 / 2),
            ),
          ),
        ),
      ),
    )

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