项目名称：QRadioButtonTest
运行结果：选中按钮后其他则无法继续选择，点击save后提示选择了那个按钮
在QRadioButtonTest.h头文件中添加槽函数
QRadioButtonTest.h

#pragma once

#include <QtWidgets/QWidget>
#include "ui_QRadioButtonTest.h"

class QRadioButtonTest : public QWidget
{
    Q_OBJECT

public:
    QRadioButtonTest(QWidget *parent = Q_NULLPTR);
public slots:
	void save();
private:
    Ui::QRadioButtonTestClass ui;
};

在QRadioButtonTest.cpp添加代码

#include "QRadioButtonTest.h"
#include <QRadioButton>
#include <QVBoxLayout>
#include <QButtonGroup>
#include <QPushButton>
#include <QMessageBox>
QRadioButtonTest::QRadioButtonTest(QWidget *parent)
    : QWidget(parent)
{
    ui.setupUi(this);
	QRadioButton *rb1 = new QRadioButton("QRadioButton001");
	QRadioButton *rb2 = new QRadioButton("QRadioButton002");
	QRadioButton *rb3 = new QRadioButton("QRadioButton003");
	//按钮组
	QButtonGroup *group = new  QButtonGroup(this);
	group->setObjectName("group");
	group->addButton(rb1);
	group->addButton(rb2);
	group->addButton(rb3);
	
	//处置布局器
	QVBoxLayout *vb = new QVBoxLayout(this);
	//添加按钮组
	for (int i = 0; i < group->buttons().size(); i++)
	{
		vb->addWidget(group->buttons()[i]);
	}
	//保存按钮
	QPushButton *save = new QPushButton("save");
	QObject::connect(save, SIGNAL(clicked()), this, SLOT(save()));
	vb->addWidget(save);
}
void QRadioButtonTest::save()
{
	//获取按钮组
	QButtonGroup *group= this->findChild<QButtonGroup*>("group");
	if (!group)return;
	//获取被选中的按钮
	QRadioButton *but = (QRadioButton *)group->checkedButton();
	if (!but)return;
	QMessageBox::information(this, "233", but->text());
}

运行结果

二,QComBox（下拉框）

首先创建项目QComBoxTest
在ui界面中选择combox

运行结果