QT：当登录成功时，关闭登录界面，跳转到新的界面中

1> 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

widget.h

#include "widget.h"
//#include "ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent)//, ui(new Ui::Widget)
{//ui->setupUi(this);this->setFixedSize(800,650);   //设置固定尺寸qDebug()<<this->windowTitle();   //获取窗口标题this->setWindowTitle("英雄去超越");this->setWindowOpacity(0.9);//5.设置窗口图标this->setWindowIcon(QIcon(":/icon/yxlm.png"));//设置大图lab1 = new QLabel(this);lab1->resize(800,380);lab1->setPixmap(QPixmap(":/icon/logo.png"));lab1->setScaledContents(true);//使用无参构造函数,构造出一个按钮btn1 = new QPushButton;btn1->setParent(this);  //将当前界面设置成父组件btn1->setText("登录");  //设置按钮上的文本内容btn1->resize(80,40);        //重新设置组件的大小btn1->move(500,550);         //移动组件btn1->setStyleSheet("background-color:cyan;");//设置样式表btn1->setIcon(QIcon(":/icon/2.png"));btn2 = new QPushButton(this);btn2->setText("取消");  //设置按钮上的文本内容btn2->resize(80,40);        //重新设置组件的大小btn2->move(600,550);         //移动组件btn2->setStyleSheet("background-color:skyblue;");//设置样式表btn2->setIcon(QIcon(":/icon/1.png"));edit1 = new QLineEdit;edit1->setParent(this);edit1->resize(300,40);edit1-> move(250,450);edit1->setEchoMode((QLineEdit::Password));edit1->setPlaceholderText("密码");edit2 = new QLineEdit(this);edit2->resize(300,40);edit2-> move(250,400);edit2->setPlaceholderText("账号");lab2 = new QLabel;lab2->setParent(this);lab2->setText("账号");lab2->resize(50,50);lab2->move(200,400);lab3 = new QLabel(this);lab3->setText("密码");lab3->resize(50,50);lab3->move(200,450);connect(btn1,SIGNAL(clicked()),this,SLOT(btn1_slot()));//qt5connect(btn2,&QPushButton::clicked,this,&Widget::btn2_slot);//将自定义的信号与槽函数进行连接connect(this,&Widget::my_signal,[&](){qDebug()<<"我已经成功连接取消按钮";btn2->resize(btn2->width()+1,btn2->height()+1);});//将同一个信号连接到同一个槽//connect(this,&Widget::my_signal,this,&Widget::close);}Widget::~Widget()
{delete ui;
}void Widget::my_slot()
{this->close();
}void Widget::btn1_slot()
{QString userName = edit2->text();QString pwd =  edit1->text();if(userName == "admin" && pwd == "123456" ){qDebug()<<"登录成功";this->close();emit jump();this->close();}else{qDebug()<<"登录失败，请重新登录";edit1->clear();}
}void Widget::btn2_slot()
{static int num = 0;qDebug()<<++num;//发射自定义的信号emit my_signal();
}

2> 新建一个工程文件，将默认提供的代码加上注释信息

工程管理文件.pro

QT       += core gui
#表示引入qt所需的类库，如核心库、图形化界面库greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
#如果超过4.0版本，系统会自动加上widgets库CONFIG += c++11
#该版本的qt支持c++11后的语法# 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#管理源文件
SOURCES += \main.cpp \widget.cpp#管理头文件
HEADERS += \widget.h#管理ui文件
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

3> 思维导图