1：思维导图

2：

#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);ui->setupUi(this);//去除头部this->setWindowFlag(Qt::FramelessWindowHint);//去掉空白部分this->setAttribute(Qt::WA_TranslucentBackground);//槽函数无法调用 手动连接connect(ui->pushButton,&QPushButton::clicked,this,&Widget::pushButton_clicked);connect(ui->pushButton_2,&QPushButton::clicked,this,&Widget::pushButton_2_clicked);
}Widget::~Widget()
{delete ui;
}//登录按钮对应槽函数
void Widget::pushButton_clicked()
{qDebug()<<".......";//获取账号内容QString get1 = ui->lineEdit->text();//获取密码内容QString get2 = ui->lineEdit_2->text();if(get1 == "123" && get2 == "123" ){//弹出信息对话框，使用静态成员函数QMessageBox::information(this,"信息","登陆成功",QMessageBox::Ok);close();//关闭窗口emit my_jump();//触发第一个界面信号}else{int ret = QMessageBox::critical(this,"错误","账号和密码不匹配",QMessageBox::Yes | QMessageBox::No);if(ret==QMessageBox::Yes){ui->lineEdit->clear();//清空内容ui->lineEdit_2->clear();}else{close();//关闭登录界面}}
}void Widget::pushButton_2_clicked()
{//弹出问题对话框int ret = QMessageBox::question(this,"?","是否退出登录？",QMessageBox::Yes | QMessageBox::No);if(ret==QMessageBox::Yes){close();}else{ui->lineEdit->clear();//清空内容ui->lineEdit_2->clear();}}