1.思维导图

2.继续完善登录框，当登录成功时，关闭登录界面，跳转到新的界面中

Second.h

#ifndef SECOND_H
#define SECOND_H#include <QWidget>
#include <QtCore/QDebug>
#include <QIcon>
#include <QPushButton>
#include <QLineEdit>
#include <QLabel>
#include <QHBoxLayout>namespace Ui {
class Second;
}class Second : public QWidget
{Q_OBJECTpublic:explicit Second(QWidget *parent = nullptr);~Second();private slots:
//    void jump_slot();   //跳转对应槽函数public slots:void slot1();//void slot2();
private:Ui::Second *ui;
};#endif // SECOND_H

Widget.h

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QtCore/QDebug>
#include <QIcon>
#include <QPushButton>
#include <QLineEdit>
#include <QLabel>
#include <QHBoxLayout>QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTQLabel *lab1=new QLabel;QLabel *lab2=new QLabel;QLabel *lab3=new QLabel;QLineEdit *edit1=new QLineEdit;QLineEdit *edit2=new QLineEdit;QPushButton *btn1=new QPushButton;QPushButton *btn2=new QPushButton;
public:Widget(QWidget *parent = nullptr);~Widget();signals:void jump();   //跳转信号public slots:void on_jumpButton_clicked(); void my_slot();private:Ui::Widget *ui;
};
#endif // WIDGET_H

main.cpp

#include "widget.h"
#include "second.h"
#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);Widget w;w.show();Second s;QObject::connect(&w,&Widget::jump,&s,&Second::slot1);//将跳转槽函数与信号连接return a.exec();
}

Second.cpp

#include "second.h"
#include "ui_second.h"Second::Second(QWidget *parent) :QWidget(parent),ui(new Ui::Second)
{ui->setupUi(this);qDebug()<<"second size="<<this->size();this->resize(350,300);qDebug()<<this->windowTitle();this->setWindowTitle("进门有惊喜");this->setWindowIcon(QIcon("C:\\Users\\Administrator\\Desktop\\icon\\logo.bmp"));// this->setScaledContents(true);this->setWindowOpacity(0.8);}Second::~Second()
{delete ui;
}void Second::slot1()
{this->show();
}

Widget.cpp

#include "widget.h"Widget::Widget(QWidget *parent): QWidget(parent){qDebug()<<this->size();qDebug()<<this->rect().size();qDebug()<<this->geometry().size();qDebug()<<this->frameGeometry().size();qDebug()<<"width:"<<this->width()<<"  height:"<<this->height();qDebug()<<"width:"<<this->size().width()<<"    height:"<<this->size().height();//设置固定窗口尺寸this->setFixedSize(500,400);//窗口标题qDebug()<<this->windowTitle();  //获取窗口标题this->setWindowTitle("牛马聚集地");//设置窗口图标this->setWindowIcon(QIcon("C:\\Users\\Administrator\\Desktop\\icon\\logo.bmp"));//设置透明度this->setWindowOpacity(0.8);//设置标签QLabel *lab1=new QLabel(this);lab1->resize(500,100);lab1->setAlignment(Qt::AlignCenter);  //垂直和水平全部居中lab1->setPixmap(QPixmap("C:\\Users\\Administrator\\Desktop\\icon\\2023725191221.bmp"));  //设置标签位图标lab1->setScaledContents(true);  //自适应QLabel *lab2=new QLabel(this);//账号图标lab2->resize(50,50);lab2->move(100,130);lab2->setPixmap(QPixmap("C:\\Users\\Administrator\\Desktop\\icon\\username.bmp"));  //设置标签位图标lab2->setScaledContents(true);  //自适应QLabel *lab3=new QLabel(this);  //密码图标lab3->resize(50,50);lab3->move(100,200);lab3->setPixmap(QPixmap("C:\\Users\\Administrator\\Desktop\\icon\\passwrd.bmp"));  //设置标签位图标lab3->setScaledContents(true);  //自适应QLineEdit *edit1=new QLineEdit;edit1->setParent(this);   //设置父组件edit1->resize(230,50);  //重新设置尺寸edit1->move(150,130);   //移动edit1->setPlaceholderText(":用户名/账号");  //设置占位符edit1->setStyleSheet("border:none;""border-bottom:2px solid black;");QLineEdit *edit2=new QLineEdit(this);//edit2->setParent;edit2->resize(230,50);edit2->move(150,200);edit2->setEchoMode(QLineEdit::Password);  //设置密文模式edit2->setPlaceholderText(":密码");  //设置占位符edit2->setStyleSheet("border:none;""border-bottom:2px solid black;");QPushButton *btn1=new QPushButton(this);btn1->setText("登录");     //设置按钮上的文本内容qDebug()<<btn1->text();   //获得按钮上的文本内容btn1->resize(80,50);     //重新设置按钮的大小qDebug()<<btn1->size();btn1->move(150,300);      //移动组件btn1->setIcon(QIcon("C:\\Users\\Administrator\\Desktop\\icon\\login.bmp"));  //设置按钮图标QPushButton *btn2=new QPushButton(this);btn2->setText("取消");     //设置按钮上的文本内容qDebug()<<btn2->text();   //获得按钮上的文本内容btn2->resize(80,50);     //重新设置按钮的大小qDebug()<<btn2->size();btn2->move(300,300);btn2->setIcon(QIcon("C:\\Users\\Administrator\\Desktop\\icon\\cancel.bmp")); //设置按钮图标connect(btn2,SIGNAL(clicked()),this,SLOT(my_slot()));//连接取消按钮//连接登录按钮connect(btn1,&QPushButton::clicked,[&](){if("admin"==edit1->text()&&"123456"==edit2->text()){qDebug()<<"登录成功"<<endl;on_jumpButton_clicked();}else{qDebug()<<"登录失败"<<endl;edit2->clear();}});}Widget::~Widget()
{}void Widget::my_slot(){this->close();
}void Widget::on_jumpButton_clicked(){emit jump();this->close();}