flutter仿支付宝余额宝年化收益折线图

绘制：
1.在pubspec.yaml中引入：fl_chart: 0.55.2
2.绘制：

import 'package:jade/utils/JadeColors.dart';
import 'package:util/easy_loading_util.dart';
import 'package:fl_chart/fl_chart.dart';
import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';

class MyLineChart extends StatefulWidget {
  const MyLineChart({Key key}) : super(key: key);

  @override
  State<MyLineChart> createState() => _MyLineChartState();
}

class _MyLineChartState extends State<MyLineChart> with TickerProviderStateMixin{

 List<String> _tabs = ['近7日','近1月','近3月'];
  TabController _tabController;

  List<Color> gradientColors = [
    Colors.yellow,
    Colors.yellow,
  ];

  //进入后默认显示指示竖线和轨迹球的点
  FlSpot _defaultShowFlSpot = FlSpot(8, 4);
  //进入页面时默认显示的点上的竖线显隐开关
  bool _showSpotLine = true;


  List<String> get weekDays => const ['10.21', '10.22', '10.23', '10.24', '10.25', '10.26', '10.27'];

 @override
  void initState() {
    // TODO: implement initState
    super.initState();
    _tabController = TabController(
        length: _tabs.length,vsync: this);
  }

  @override
  void dispose() {
    // TODO: implement dispose
    _tabController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      child: Column(
        children: <Widget>[
         _tabBarView(),
          _lineChartWidget()
        ],
      ),
    );
  }

//选项卡
  _tabBarView(){
    return Container(
      width: double.infinity,
      height: 120.w,
      margin: EdgeInsets.only(bottom: 20.w),
      decoration: BoxDecoration(
        color: JadeColors.lightGrey,
        borderRadius: BorderRadius.circular(5)
      ),
      child: Column(
        children: [
         Container(
           height: 70.w,
           child: TabBar(
             isScrollable: false,
             labelPadding: EdgeInsets.symmetric(horizontal: 0),
             indicator: BoxDecoration(
                 color: Colors.white,
                 borderRadius: BorderRadius.circular(5),
                 border: Border.all(width: 2,color: JadeColors.lightGrey)
             ),
             labelColor: Color(0xff333333),
             labelStyle: TextStyle(
               fontSize: 30.sp,
               fontWeight: FontWeight.w600,
             ),
             unselectedLabelColor: JadeColors.grey,
             unselectedLabelStyle: TextStyle(
                 fontSize: 30.sp,
                 fontWeight: FontWeight.w300
             ),
             indicatorSize: TabBarIndicatorSize.tab,
             controller: _tabController,
             tabs: _tabs
                 .map((value) => Container(
                width: double.infinity,
                height: double.infinity,
                 padding: EdgeInsets.symmetric(horizontal: 20.w),
                 alignment: Alignment.center,
                 decoration: BoxDecoration(
                   borderRadius: BorderRadius.only(
                       topLeft: value == _tabs.first? Radius.circular(5): Radius.circular(0),
                       bottomLeft: value == _tabs.first? Radius.circular(5): Radius.circular(0),
                       topRight: value == _tabs.last? Radius.circular(5): Radius.circular(0),
                       bottomRight: value == _tabs.last? Radius.circular(5): Radius.circular(0),
                   ),
                   border: Border.all(width: 1.w,color: JadeColors.grey_4)
                 ),
                 child: Text(value))
             ).toList(),
             onTap: (index) {
               esLoadingToast('点击${_tabs[index]}');
             },
           )
         ),
          Expanded(child: Container(
            margin: EdgeInsets.only(left: 40.w,right: 40.w),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                Text('2023-10-30',style: TextStyle(color: JadeColors.grey_2,fontSize: 22.sp,fontWeight: FontWeight.bold),),
                Text.rich(TextSpan(
                    children: [
                      TextSpan(
                          text: '核销数：',
                          style: TextStyle(color: JadeColors.grey_3,fontSize: 22.sp)
                      ),
                      TextSpan(
                          text: '5',
                          style: TextStyle(color: JadeColors.orange,fontSize: 22.sp)
                      )
                    ]
                ))
              ],
            ),
          ))
        ],
      ),
    );
  }

//折线图表
  _lineChartWidget(){
    return AspectRatio(
      aspectRatio: 1.70,
      child: Padding(
          padding: EdgeInsets.only(
            right: 40.w,
          ),
          child: LineChart(mainData())

      ),
    );
  }

  LineChartData mainData() {
    return LineChartData(
      //网格
      gridData: FlGridData(
        show: true,
        drawVerticalLine: false,
        horizontalInterval: 1,
        verticalInterval: 1,
        getDrawingHorizontalLine: (value) {
          return  FlLine(
            color: JadeColors.lightGrey,
            strokeWidth: 1,
          );
        },
        getDrawingVerticalLine: (value) {
          return  FlLine(
            color: Colors.red,
            strokeWidth: 1,
          );
        },
      ),
      titlesData: FlTitlesData(
        show: true,
        rightTitles:  AxisTitles(
          sideTitles: SideTitles(showTitles: false),
        ),
        topTitles:  AxisTitles(
          sideTitles: SideTitles(showTitles: false),
        ),
        bottomTitles: AxisTitles(
          sideTitles: SideTitles(
            showTitles: true,
            reservedSize: 30,
            interval: 2,
            getTitlesWidget: bottomTitleWidgets,
          ),
        ),
        leftTitles: AxisTitles(
          sideTitles: SideTitles(
            showTitles: true,
            interval: 1,
            getTitlesWidget: leftTitleWidgets,
            reservedSize: 30,
          ),
        ),
      ),
      borderData: FlBorderData(
        show: true,
        //  border: Border.symmetric(horizontal: BorderSide(color: JadeColors.lightGrey, width: 1)),
        border: Border.fromBorderSide( BorderSide(color: JadeColors.lightGrey, width: 1)),
      ),
      minX: 0,
      maxX: 12,
      minY: 0,
      maxY: 6,
      lineBarsData: [
        LineChartBarData(
          spots: const [
            FlSpot(0, 0),
            FlSpot(2.6, 4),
            FlSpot(4.9, 5),
            FlSpot(6.8, 3.1),
            FlSpot(8, 4),
            FlSpot(9.5, 3),
            FlSpot(12, 6),
          ],
          isCurved: false,
          gradient: LinearGradient(
            colors: gradientColors,
          ),
          barWidth: 2,
          dotData:  FlDotData(
            show: _showSpotLine,
            getDotPainter: (spot, percent, barData, index) {
              //当点是默认要显示的点时
              if(spot == _defaultShowFlSpot){
                return FlDotCirclePainter(
                  strokeWidth: 1,
                  strokeColor: const Color(0xffF27800),
                  radius: 2,
                  color: Colors.white,
                );
              }
              return FlDotCirclePainter(
                strokeWidth: 0,
                strokeColor: Colors.yellow,
                radius: 1,
                color: Colors.yellow,
              );
            }

          ),
          belowBarData: BarAreaData(
            show: true,
            gradient: LinearGradient(
                colors: [Colors.yellow,Colors.white]
                    .map((color) => color.withOpacity(0.3))
                    .toList(),
                begin: Alignment.topCenter, end: Alignment.bottomCenter
            ),
              spotsLine: BarAreaSpotsLine(
                show: _showSpotLine,
                flLineStyle: FlLine(
                  color: const Color(0xffF27800),
                  strokeWidth: 1,
                ),
                checkToShowSpotLine: (spot) {
                  if (spot == _defaultShowFlSpot) {
                    return true;
                  }
                  return false;
                },
              ),
          ),
          aboveBarData: BarAreaData(
            show: _showSpotLine,
            gradient: LinearGradient(
                colors: [Colors.white,Colors.white]
                    .map((color) => color.withOpacity(0.3))
                    .toList(),
                begin: Alignment.topCenter, end: Alignment.bottomCenter
            ),
            spotsLine: BarAreaSpotsLine(
              show: true,
              flLineStyle: FlLine(
                color: const Color(0xffF27800),
                strokeWidth: 1,
              ),
              checkToShowSpotLine: (spot) {
                if (spot == _defaultShowFlSpot) {
                  return true;
                }
                return false;
              },
            ),
          ),
        ),
      ],
      lineTouchData: LineTouchData(
        enabled: true,
          getTouchLineEnd: (data, index) => double.infinity,
          getTouchedSpotIndicator: (LineChartBarData barData, List<int> spotIndexes) {
            return spotIndexes.map((spotIndex) {
              return TouchedSpotIndicatorData(
                //接触点竖线
                 FlLine(color: const Color(0xffF27800), strokeWidth: 1),
                FlDotData(
                  //设置接触点 轨迹球画笔
                  getDotPainter: (spot, percent, barData, index) =>
                      FlDotCirclePainter(
                        strokeWidth: 1,
                        strokeColor: const Color(0xffF27800),
                        radius: 2,
                        color: Colors.white,
                      ),
                ),
              );
            }).toList();
          },
        touchTooltipData: LineTouchTooltipData(
            tooltipBgColor:Colors.black26
        ),
        touchCallback: (FlTouchEvent event,LineTouchResponse response){
          if(event!= null){
            bool isInteractions = event.isInterestedForInteractions; //手指是否和图表交互(手指和图标交互时隐藏默认显示的点的指示线和轨迹球，手指离开时则隐藏)
            setState(() {
              _showSpotLine = !isInteractions;
            });
          }

          if(response != null){
            TouchLineBarSpot touchLineBarSpot = response?.lineBarSpots?.first;
            int spotIndex = touchLineBarSpot?.spotIndex;
            LineChartBarData lineChartBarData = touchLineBarSpot?.bar;
            if(lineChartBarData != null && spotIndex != null){
              FlSpot flSpot = lineChartBarData.spots[spotIndex];

              // print('spotIndex= ${touchLineBarSpot?.spotIndex}'); //接触的是折线的第几个圆点
              // print('barIndex= ${touchLineBarSpot?.barIndex}'); //接触的是第几条折线
              // print('flSpot.x= ${flSpot?.x}');
              print('flSpot.y= ${flSpot?.y}');
              // print('spotIndex= ${touchLineBarSpot?.props}');
            }
          }
        }
      )
    );
  }

  Widget bottomTitleWidgets(double value, TitleMeta meta) {
    TextStyle style = TextStyle(
      fontWeight: FontWeight.w600,
      fontSize: 22.sp,
    );
    Widget text;
    switch (value.toInt()) {
      case 0:
        text = Text('10.25', style: style);
        break;
      case 2:
        text = Text(' 10.26 ', style: style);
        break;
      case 4:
        text = Text(' 10.27 ', style: style);
        break;
      case 6:
        text = Text(' 10.28 ', style: style);
        break;
      case 8:
        text = Text(' 10.29 ', style: style);
        break;
      case 10:
        text = Text(' 10.30 ', style: style);
        break;
      case 12:
        text = Text(' 10.31 ', style: style);
        break;
      default:
        text = Text('', style: style);
        break;
    }

    return SideTitleWidget(
      axisSide: meta.axisSide,
      child: text,
    );
  }

  Widget leftTitleWidgets(double value, TitleMeta meta) {
    TextStyle style = TextStyle(
      fontWeight: FontWeight.w600,
      fontSize: 22.sp,
    );
    String text;
    switch (value.toInt()) {
      case 0:
        text = '0';
        break;
      case 1:
        text = '2';
        break;
      case 2:
        text = '4';
        break;
      case 3:
        text = '6';
        break;
      case 4:
        text = '8';
        break;
      case 5:
        text = '10';
        break;
      default:
        return Container();
    }

    return Text(text, style: style, textAlign: TextAlign.center);
  }
}
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切换的选项卡没有绘制。对应的数据和坐标点之间的换算没做，要根据后台给的数据操作，现在这个只是单纯的绘制。