QT第一天

使用QT实现一个文本框和两个按钮，文本框在任意按钮点击时计数并显示出来。

运行结果：

代码：

main.cpp

#include "widget.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    return a.exec();
}

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();
public slots:
    void btnClickFun(void);
private:
    Ui::Widget *ui;
    int n;
};
#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    n = 0;

    connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(btnClickFun()));
    connect(ui->pushButton_2, SIGNAL(clicked()), this, SLOT(btnClickFun()));
}

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

void Widget::btnClickFun()
{
    QString str = QString("共点击了%1次").arg(++n);
    ui->label->setText(str);
}

widget.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>Widget</class>
 <widget class="QWidget" name="Widget">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>450</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Widget</string>
  </property>
  <widget class="QLabel" name="label">
   <property name="geometry">
    <rect>
     <x>330</x>
     <y>80</y>
     <width>161</width>
     <height>61</height>
    </rect>
   </property>
   <property name="text">
    <string>点击按钮开始计数</string>
   </property>
  </widget>
  <widget class="QPushButton" name="pushButton">
   <property name="geometry">
    <rect>
     <x>230</x>
     <y>270</y>
     <width>89</width>
     <height>25</height>
    </rect>
   </property>
   <property name="text">
    <string>按钮1</string>
   </property>
  </widget>
  <widget class="QPushButton" name="pushButton_2">
   <property name="geometry">
    <rect>
     <x>460</x>
     <y>270</y>
     <width>89</width>
     <height>25</height>
    </rect>
   </property>
   <property name="text">
    <string>按钮2</string>
   </property>
  </widget>
 </widget>
 <resources/>
 <connections/>
</ui>