第一个界面头部的代码

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QPushButton>
#include<QLabel>
#include<QIcon>
#include<QLineEdit>
#include<QDebug>
class Widget : public QWidget
{Q_OBJECTsignals:void jump();
public slots://自定义登录按钮的信号处理函数void butn1_slot();public:Widget(QWidget *parent = 0);~Widget();QLabel *label1;QLabel *label2;QLabel *label3;QLineEdit *edit1;QLineEdit *edit2;QPushButton *butn1;QPushButton *butn2;
};#endif // WIDGET_H

第一个界面的代码

#include "widget.h"void Widget::butn1_slot()
{if(this->edit1->text() == "admin"&&this->edit2->text() == "123456"){qDebug()<<"登录成功";emit jump();this->close();//登陆成功后消失}else {qDebug() << "账号或密码有误请重新输入";}}Widget::Widget(QWidget *parent): QWidget(parent)
{this->setWindowIcon(QIcon(":/icon/logo.png"));this->setWindowTitle("HQYJChat");this->resize(700,750);this->setStyleSheet("background-color:white");label1 = new QLabel(this);label1->setPixmap(QPixmap(":/icon/logo.png"));label1->resize(700,260);label1->setScaledContents(true);label2 = new QLabel(this);label2->setPixmap(QPixmap(":/icon/userName.jpg"));label2->resize(30,30);label2->move(170,320);label2->setScaledContents(true);label3 = new QLabel(this);label3->setPixmap(QPixmap(":/icon/passwd.jpg"));label3->resize(30,30);label3->move(170,390);label3->setScaledContents(true);edit1 = new QLineEdit(this);edit1->move(210,310);edit1->resize(300,50);edit1->setStyleSheet("border:none;border-bottom:2px solid lightblue");edit1->setPlaceholderText("QQ号/微信/邮箱");edit2 = new QLineEdit(this);edit2->move(210,380);edit2->resize(300,50);edit2->setStyleSheet("border:none;border-bottom:2px solid lightblue");edit2->setPlaceholderText("密码");edit2->setEchoMode(QLineEdit::Password);butn1 = new QPushButton(this);butn1->move(210,490);butn1->resize(100,50);butn1->setText("登录");butn1->setIcon(QIcon(":/icon/login.png"));connect(this->butn1,SIGNAL(clicked()),this,SLOT(butn1_slot()));//qt4版本的连接butn2 = new QPushButton(this);butn2->move(380,490);butn2->resize(100,50);butn2->setText("取消");butn2->setIcon(QIcon(":/icon/cancel.png"));connect(this->butn2,&QPushButton::clicked,this,&Widget::close);//qt5版本的连接}Widget::~Widget()
{}

第二个界面cpp里的的代码

#include "second.h"
#include "ui_second.h"void Second::jump()
{this->show();
}Second::Second(QWidget *parent) :QWidget(parent),ui(new Ui::Second)
{ui->setupUi(this);}Second::~Second()
{delete ui;
}

第二个界面头部的代码

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