QT ComBoBox 下拉选项框的简单应用

1.实现效果

2.UI界面设计

3.mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
public slots:
    void print_s();

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

4.mainwindow.cpp

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

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
     QObject::connect(ui->comboBox,SIGNAL(currentIndexChanged(QString)),this,SLOT(print_s()));
}

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

void MainWindow::print_s()
{
    if(ui->comboBox->currentIndex()==0)
    {
        ui->lineEdit->setText("校准模式1");
    }
   if(ui->comboBox->currentIndex()==1)
    {
        ui->lineEdit->setText("校准模式2");
    }
    if(ui->comboBox->currentIndex()==2)
    {
        ui->lineEdit->setText("校准云图模式");
    }
}

5.main.cpp

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}