1> 繼續(xù)完善登錄框，當(dāng)?shù)卿洺晒r(shí)，關(guān)閉登錄界面，跳轉(zhuǎn)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);   //設(shè)置固定尺寸
    qDebug()<<this->windowTitle();   //獲取窗口標(biāo)題
    this->setWindowTitle("英雄去超越");
    this->setWindowOpacity(0.9);

    //5.設(shè)置窗口圖標(biāo)
    this->setWindowIcon(QIcon(":/icon/yxlm.png"));

    //設(shè)置大圖
    lab1 = new QLabel(this);
    lab1->resize(800,380);
    lab1->setPixmap(QPixmap(":/icon/logo.png"));
    lab1->setScaledContents(true);

    //使用無參構(gòu)造函數(shù),構(gòu)造出一個(gè)按鈕
    btn1 = new QPushButton;
    btn1->setParent(this);  //將當(dāng)前界面設(shè)置成父組件
    btn1->setText("登錄");  //設(shè)置按鈕上的文本內(nèi)容
    btn1->resize(80,40);        //重新設(shè)置組件的大小
    btn1->move(500,550);         //移動(dòng)組件
    btn1->setStyleSheet("background-color:cyan;");//設(shè)置樣式表
    btn1->setIcon(QIcon(":/icon/2.png"));

    btn2 = new QPushButton(this);
    btn2->setText("取消");  //設(shè)置按鈕上的文本內(nèi)容
    btn2->resize(80,40);        //重新設(shè)置組件的大小
    btn2->move(600,550);         //移動(dòng)組件
    btn2->setStyleSheet("background-color:skyblue;");//設(shè)置樣式表
    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("密碼");

    edit2 = new QLineEdit(this);
    edit2->resize(300,40);
    edit2-> move(250,400);
    edit2->setPlaceholderText("賬號(hào)");

    lab2 = new QLabel;
    lab2->setParent(this);
    lab2->setText("賬號(hào)");
    lab2->resize(50,50);
    lab2->move(200,400);

    lab3 = new QLabel(this);
    lab3->setText("密碼");
    lab3->resize(50,50);
    lab3->move(200,450);

    connect(btn1,SIGNAL(clicked()),this,SLOT(btn1_slot()));

    //qt5
    connect(btn2,&QPushButton::clicked,this,&Widget::btn2_slot);


    //將自定義的信號(hào)與槽函數(shù)進(jìn)行連接
    connect(this,&Widget::my_signal,[&](){
        qDebug()<<"我已經(jīng)成功連接取消按鈕";
        btn2->resize(btn2->width()+1,btn2->height()+1);
    });

    //將同一個(gè)信號(hào)連接到同一個(gè)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()<<"登錄成功";
        this->close();
        emit jump();
        this->close();
    }else
    {
        qDebug()<<"登錄失敗，請(qǐng)重新登錄";
        edit1->clear();
    }
}

void Widget::btn2_slot()
{
    static int num = 0;
    qDebug()<<++num;

    //發(fā)射自定義的信號(hào)
    emit my_signal();
}

2> 新建一個(gè)工程文件，將默認(rèn)提供的代碼加上注釋信息

工程管理文件.pro

QT       += core gui
#表示引入qt所需的類庫，如核心庫、圖形化界面庫

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
#如果超過4.0版本，系統(tǒng)會(huì)自動(dòng)加上widgets庫

CONFIG += c++11
#該版本的qt支持c++11后的語法

# 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

#管理頭文件
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> 思維導(dǎo)圖

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