QTchart制作一个简单的数据图，但总是显示未定义的错误

Question

问题遇到的现象和发生背景

想要通过QTchart制作一个简单的数据图，但总是显示未定义的错误，qt的所有插件库等均已安装，尝试多次没有办法解决，求解惑

用代码块功能插入代码，请勿粘贴截图

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
createChart();
}

void MainWindow::createChart()
{
QChartView *chartView = new QChartView(this);
QChart *chart = new QChart();
chart->setTitle("简单函数曲线");
chartView->setChart(chart);
this->setCentralWidget(chartView);
QLineSeries *series0 = new QLineSeries();
QLineSeries *series1 = new QLineSeries();
series0->setName("Sin曲线");
series1->setName("Cos曲线");
chart->addSeries(series0);
chart->addSeries(series1);
qreal t=0,y1,y2,intv=0.1;
int cnt=100;
for(int i = 0;i<cnt;i++)
{
y1=qSin(t);//+qrand();
series0>append(t,y1);
y2=qSin(t+20);
series1->append(t,y2);
t+=intv;
}
QValueAxis *axisX = new QValueAxis;
axisX->setRange(0,10);
axisX->setTitleText("time(secs)");

QValueAxis *axisY = new QValueAxis;
axisY->setRange(-2,2);
axisY->setTitleText("value");

chart->setAxisX(axisX,series0);
chart->setAxisY(axisY,series0);
chart->setAxisX(axisX,series1);
chart->setAxisY(axisY,series1);

}

MainWindow::~MainWindow()
{
delete ui;
}

运行结果及报错内容

我想要达到的结果

能够正常运行

Answer 1

createChart()函数在头文件的类里面没有声明吧，在cpp那个只是定义，提示报错找不到这个成员函数