四、QT设置两个开关，可以控制另外一个页面的开启和关闭-Toy模板网

这篇具有很好参考价值的文章主要介绍了四、QT设置两个开关，可以控制另外一个页面的开启和关闭。希望对大家有所帮助。如果存在错误或未考虑完全的地方，请大家不吝赐教，您也可以点击"举报违法"按钮提交疑问。

1、Show.pro工程文件

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    main.cpp \
    widget.cpp \
    widget2.cpp

HEADERS += \
    widget.h \
    widget2.h

FORMS += \
    widget.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

2、widget.h文件

#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();

private:
    Ui::Widget *ui;
};
#endif // WIDGET_H

3、widget2.h文件

#ifndef WIDGET2_H
#define WIDGET2_H

#include <QWidget>

class Widget2 : public QWidget
{
    Q_OBJECT
public:
    explicit Widget2(QWidget *parent = nullptr);
    QWidget * w = new QWidget;

signals:
    void start();

public slots:
    void showOtherWindow();  //设置一个出现另外一个window的槽
    void closeOtherWindow(); //关闭另外一个窗口
};

#endif // WIDGET2_H

4、main.cpp

#include "widget.h"
#include"widget2.h"
#include <QApplication>

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

5、widget.cpp

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

    //QWidget *w = new QWidget;   //这里要用QWidget不能用Widegt不然会无限循环
    Widget2 *w = new Widget2;
    QPushButton * btn1 = new QPushButton("open",this);   //设置open按钮
    QPushButton * btn2 = new QPushButton("close",this);  //设置close按钮

    this->setFixedSize(600,800);  //不可拖拉界面大小

    btn1->move(200,200);     //移动按钮位置
    btn2->move(200,400);

    btn1->resize(200,100);   //改变按钮大小
    btn2->resize(200,100);

    connect(btn1,&QPushButton::clicked,w,&Widget2::showOtherWindow);

    connect(btn2,&QPushButton::clicked,w,&Widget2::closeOtherWindow);
}


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

6、widget2.cpp

#include "widget2.h"

Widget2::Widget2(QWidget *parent) : QWidget(parent)
{
    w->setFixedSize(600,800);
}

void Widget2::showOtherWindow()
{
    w->show();
}

void Widget2::closeOtherWindow()
{
    w->close();
}