qt 设置QLabel 放置在qchart中下方

可以使用QChartView类中的setRenderHint()函数来设置渲染标志，然后将QLabel放置在QChartView下方。

以下是一个示例代码：

#include <QtWidgets/QApplication>
#include <QtWidgets/QMainWindow>
#include <QtCharts/QChartView>
#include <QtCharts/QChart>
#include <QtWidgets/QLabel>

QT_CHARTS_USE_NAMESPACE

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QMainWindow window;

    // 创建图表
    QChart *chart = new QChart();
    chart->setTitle("Chart Title");
    chart->legend()->hide();

    // 创建坐标轴
    QValueAxis *axisX = new QValueAxis();
    axisX->setTitleText("X Axis Title");
    chart->addAxis(axisX, Qt::AlignBottom);

    QValueAxis *axisY = new QValueAxis();
    axisY->setTitleText("Y Axis Title");
    chart->addAxis(axisY, Qt::AlignLeft);

    // 创建数据
    QSplineSeries *series = new QSplineSeries();
    *series << QPointF(0, 6) << QPointF(1, 4) << QPointF(2, 2) << QPointF(3, 5) << QPointF(4, 3);
    chart->addSeries(series);

    // 将数据绑定到坐标轴
    series->attachAxis(axisX);
    series->attachAxis(axisY);

    // 创建图表视图
    QChartView *chartView = new QChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing); // 设置渲染标志

    // 创建标签
    QLabel *label = new QLabel("Label Text", &window);
    label->setAlignment(Qt::AlignCenter);

    // 将标签放置在图表视图下方
    label->setGeometry(chartView->x(), chartView->y() + chartView->height(), chartView->width(), 50);

    // 将图表视图和标签添加到主窗口
    window.setCentralWidget(chartView);
    window.setCentralWidget(label);

    window.resize(800, 600);
    window.show();

    return a.exec();
}