首先新建一個專案命名為“QtGuuitest3”

雙擊 "QtGuitest3.ui"

其中按鈕的名字是pushButton

多行文字框為plainTextEdit

在QtGuuitest3.h中新增

#pragma once

#include <QtWidgets/QMainWindow>
#include "ui_QtGuitest3.h"

class QtGuitest3 : public QMainWindow
{
	Q_OBJECT

public:
	QtGuitest3(QWidget *parent = Q_NULLPTR);
private slots:
    int OnShowClicked(bool checked);
 

private:
	Ui::QtGuitest3Class ui;
};
private slots:
    int OnShowClicked(bool checked);
private:
	Ui::QtGuitest3Class ui;
};

其中宣告的

private slots:
    int OnShowClicked(bool checked);

是事件的處理函式

在QtGuuitest3.cpp中

新增

#include "QtGuitest3.h"

QtGuitest3::QtGuitest3(QWidget *parent)
	: QMainWindow(parent)
{
	ui.setupUi(this);
	connect(ui.pushButton,SIGNAL(clicked(bool)),this,SLOT(OnShowClicked(bool)));
 

}
int QtGuitest3::OnShowClicked(bool checked)
{
	ui.plainTextEdit->setPlainText("Hello,World");
	return 0;
}connect(ui.pushButton,SIGNAL(clicked(bool)),this,SLOT(OnShowClicked(bool)));
}
int QtGuitest3::OnShowClicked(bool checked)
{
	ui.plainTextEdit->setPlainText("Hello,World");
	return 0;
}

編譯連結

搞定