我希望在 QWidget 中显示的两个 QLabels 和 QChart 具有相同的大小。这就是我的设计的样子：
Qt 设计
但我总是在右侧（黑色矩形）的那个 QWidget 内得到更小的 QChart。如图所示：
QChart
所以我将 QChart 放入 QWidget 的代码如下所示：
m_chart = new QChartView(createBarChart());
m_chart->setRenderHint(QPainter::Antialiasing);
m_gridLayout = new QGridLayout(ui->widget);
m_gridLayout->addWidget(m_chart, 0, 0);
并 createBarChart 返回指向 QChart 的指针：
QChart* MainWindow::createBarChart()
主窗口.ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>1374</width>
<height>918</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralWidget">
<layout class="QVBoxLayout" name="verticalLayout_2">
<property name="spacing">
<number>6</number>
</property>
<property name="leftMargin">
<number>9</number>
</property>
<property name="topMargin">
<number>9</number>
</property>
<property name="rightMargin">
<number>9</number>
</property>
<property name="bottomMargin">
<number>9</number>
</property>
<item>
<layout class="QHBoxLayout" name="horizontalLayout_3">
<property name="spacing">
<number>5</number>
</property>
<property name="leftMargin">
<number>0</number>
</property>
<item>
<widget class="QLabel" name="labelLogo">
<property name="text">
<string>TextLabel</string>
</property>
</widget>
</item>
</layout>
</item>
<item>
<layout class="QVBoxLayout" name="verticalLayout">
<property name="spacing">
<number>0</number>
</property>
<property name="topMargin">
<number>0</number>
</property>
<item>
<widget class="QGroupBox" name="groupBox">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Expanding">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="title">
<string/>
</property>
<layout class="QHBoxLayout" name="horizontalLayout">
<property name="spacing">
<number>6</number>
</property>
<property name="topMargin">
<number>9</number>
</property>
<item>
<spacer name="horizontalSpacer_2">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>40</width>
<height>20</height>
</size>
</property>
</spacer>
</item>
<item>
<widget class="QLabel" name="label_1">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Expanding">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="minimumSize">
<size>
<width>300</width>
<height>500</height>
</size>
</property>
<property name="baseSize">
<size>
<width>300</width>
<height>500</height>
</size>
</property>
<property name="autoFillBackground">
<bool>false</bool>
</property>
<property name="styleSheet">
<string notr="true">border: 1px solid;
background-color: #CFCFCF;</string>
</property>
<property name="text">
<string/>
</property>
</widget>
</item>
<item>
<spacer name="horizontalSpacer_3">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>50</width>
<height>20</height>
</size>
</property>
</spacer>
</item>
<item>
<widget class="QLabel" name="label_2">
<property name="sizePolicy">
<sizepolicy hsizetype="Expanding" vsizetype="Expanding">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="minimumSize">
<size>
<width>300</width>
<height>500</height>
</size>
</property>
<property name="baseSize">
<size>
<width>300</width>
<height>500</height>
</size>
</property>
<property name="styleSheet">
<string notr="true">border: 1px solid;
background-color: #CFCFCF;</string>
</property>
<property name="lineWidth">
<number>1</number>
</property>
<property name="text">
<string/>
</property>
</widget>
</item>
<item>
<spacer name="horizontalSpacer_4">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>40</width>
<height>20</height>
</size>
</property>
</spacer>
</item>
<item>
<widget class="QWidget" name="widget" native="true">
<property name="minimumSize">
<size>
<width>300</width>
<height>500</height>
</size>
</property>
<property name="baseSize">
<size>
<width>100</width>
<height>500</height>
</size>
</property>
</widget>
</item>
</layout>
</widget>
</item>
<item>
<widget class="QGroupBox" name="groupBox_2">
<property name="title">
<string/>
</property>
<property name="flat">
<bool>true</bool>
</property>
<layout class="QHBoxLayout" name="horizontalLayout_2">
<item>
<spacer name="horizontalSpacer">
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>40</width>
<height>20</height>
</size>
</property>
</spacer>
</item>
<item>
<widget class="QPushButton" name="replayButton">
<property name="enabled">
<bool>false</bool>
</property>
<property name="text">
<string>replay</string>
</property>
</widget>
</item>
<item>
<widget class="QPushButton" name="startButton">
<property name="sizePolicy">
<sizepolicy hsizetype="Preferred" vsizetype="Minimum">
<horstretch>0</horstretch>
<verstretch>0</verstretch>
</sizepolicy>
</property>
<property name="text">
<string>start</string>
</property>
</widget>
</item>
</layout>
</widget>
</item>
</layout>
</item>
</layout>
</widget>
<widget class="QMenuBar" name="menuBar">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>1374</width>
<height>22</height>
</rect>
</property>
</widget>
<widget class="QStatusBar" name="statusBar"/>
</widget>
<layoutdefault spacing="6" margin="11"/>
<resources/>
<connections/>
</ui>
这是我运行时 UI 的样子：
用户界面
