.h文件

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();public slots:void buttonLable();private:Ui::Widget *ui;
};
#endif // WIDGET_H

.cpp文件

#include "widget.h"
#include "ui_widget.h"
#include <QDebug>int i = 1;
Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);connect(ui->pushButton, SIGNAL( clicked()) ,  this, SLOT(buttonLable()));connect(ui->pushButton_2, SIGNAL( clicked()) ,  this, SLOT(buttonLable()));
}Widget::~Widget()
{delete ui;
}void Widget::buttonLable()
{qDebug()<<"void buttonLable()";QString str = QString("此按键点击了 %1 次").arg(i++);this->ui->label->setText(str);
}

现象