20230831-完成登录框的按钮操作，并在登录成功后进行界面跳转-编程知识

登录框的按钮操作，并在登录成功后进行界面跳转

app.cpp

#include "app.h"
#include <cstdio>
#include <QDebug>
#include <QLineEdit>
#include <QLabel>
#include <QPainter>
#include <QString>
#include <QMessageBox>
#include <QRegExp>APP::APP(QWidget *parent) : QWidget(parent)
{//================构建窗口setWindowTitle==============================//this->setWindowTitle("阿巴阿巴");this->setWindowIcon(QIcon("C:/Users/BlackMC/Desktop/icon/wodepeizhenshi.png"));this->resize(430,327);//this->setStyleSheet("background-color:pink");//设定窗口透明度this->setWindowOpacity(1.5);//================构建画面===========================================//bel3 = new QLabel("",this);bel3->resize(430,148);//bel3->setPixmap(QPixmap("G:/steam/steamapps/workshop/content/431960/2949578938/preview.jpg"));bel3->setPixmap(QPixmap("C:/Users/BlackMC/Desktop/icon/p3.jpg"));bel3->setScaledContents(true);//图片自适应//================构建标签账户(Lable)================================//bel1 = new QLabel("账户",this);bel1->resize(35,35);bel1->setPixmap(QPixmap("C:/Users/BlackMC/Desktop/icon/userName.jpg"));bel1->setScaledContents(true);bel1->move(120,163);//================构建标签密码(Lable)================================//bel2 = new QLabel("密码",this);bel2->resize(35,35);bel2->setPixmap(QPixmap("C:/Users/BlackMC/Desktop/icon/passwd.jpg"));bel2->setScaledContents(true);bel2->move(118,220);//================构建输入框账户(Lable)==============================//edit1 = new QLineEdit(this);edit1->setStyleSheet("background-color:cyan");edit1->setPlaceholderText("QQ密码/手机/邮箱");edit1->resize(150,32);edit1->move(bel1->x()+55,163);//================构建输入框密码(Lable)==============================//edit2 = new QLineEdit(this);edit2->setStyleSheet("background-color:cyan");edit2->resize(150,32);edit2->move(bel2->x()+55,220);edit2->setPlaceholderText("密码");edit2->setEchoMode(QLineEdit :: Password);//================构建按钮登录(QPushButton)=========================//but1 = new QPushButton("登录",this);but1->setStyleSheet("background-color:orange");but1->resize(70,30);but1->move(195,280);but1->setIcon(QIcon("C:/Users/BlackMC/Desktop/icon/login.png"));//================构建按钮取消(QPushButton)=========================//but2 = new QPushButton("取消",this);but2->setStyleSheet("background-color:orange");but2->resize(but1->size());but2->move(but1->x()+90,280);but2->setIcon(QIcon("C:/Users/BlackMC/Desktop/icon/cancel.png"));//================构建按钮登录控件==================================//connect(but1,&QPushButton::clicked,this,&APP::on_111_clicked);//================使用qt4版本的链接，将按钮发射的pressed信号与按钮槽链接=////================构建按钮取消控件==================================//connect(but2,SIGNAL(pressed()),but1,SLOT(close()));}APP::~APP()
{
}//按钮登录的槽函数——1
void APP::on_111_clicked()
{int result1 = QString::compare("tjq", edit1->text(), Qt::CaseInsensitive);int result2 = QString::compare("123456", edit2->text(), Qt::CaseInsensitive);if(result1 == 0 && result2 == 0)    //登录成功!{int ret = QMessageBox::warning(this, QStringLiteral("Good"), QStringLiteral("登录成功!"), QMessageBox::Cancel | QMessageBox::Ok);if( ret == QMessageBox::Ok){emit jump();this->close();//connect(but1,&QPushButton::released,this,&APP::on_jumpsecond);//connect(QMessageBox::Ok,SIGNAL(QMessageBox::Ok),this,SLOT(&APP::on_jumpsecond));}}else        //登录失败!{QMessageBox::warning(this, QStringLiteral("Error!"), QStringLiteral("登录失败!"), QMessageBox::Cancel | QMessageBox::Ok);edit2->clear();}}
//按钮登录的槽函数——2
/*void APP::on_jumpsecond()

app.h

#include <QDebug>
#include <QLineEdit>
#include <QLabel>
#include <QPainter>
#include <cstdio>
#include <QString>
#include <QMessageBox>
#include <QRegExp>class APP : public QWidget
{Q_OBJECTsignals:void my_signal();//信号函数void jump();//信号函数
public slots://自定义的槽函数列(只有槽函数才作用与connect的槽函数参数)void on_111_clicked();//登录按钮触发-槽函数//void on_jumpsecond();//界面跳转触发-槽函数public:APP(QWidget *parent = nullptr);~APP();
private:QLabel *bel1;QLabel *bel2;QLabel *bel3;QLineEdit *edit1;QLineEdit *edit2;QPushButton *but1;QPushButton *but2;
};
#endif // APP_H

second.cpp

#include "second.h"
#include "ui_second.h"Second::Second(QWidget *parent):QWidget(parent),ui(new Ui::Second)
{//================构建窗口setWindowTitle==============================//this->setWindowTitle("QQ界面");this->setStyleSheet("background-color:pink");//this->setWindowIcon(QIcon("C:/Users/BlackMC/Desktop/icon/wodepeizhenshi.png"));this->resize(820,327);//设定窗口透明度this->setWindowOpacity(2.0);//===========================================================//ui->setupUi(this);
}Second::~Second()
{delete ui;
}void Second::jump_second()
{this->show();
}

second.h

#ifndef SECOND_H
#define SECOND_H#include <QWidget>namespace Ui {
class Second;
}class Second : public QWidget
{Q_OBJECTpublic slots:      //槽函数void jump_second();public:explicit Second(QWidget *parent = nullptr);~Second();private:Ui::Second *ui;
};#endif // SECOND_H

main.cpp

#include "app.h"
#include "second.h"#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);APP w;w.show();Second f;QObject::connect(&w,&APP::jump,&f,&Second::jump_second);return a.exec();
}