1.

 头文件

#ifndef MYWIDGET_H
#define MYWIDGET_H#include <QWidget>
#include <QMovie>
#include <QTextEdit>
#include <QDebug>
namespace Ui {
class MyWidget;
}class MyWidget : public QWidget
{Q_OBJECTpublic:explicit MyWidget(QWidget *parent = nullptr);~MyWidget();private:Ui::MyWidget *ui;public slots:void my_close();void login_slot();
};#endif // MYWIDGET_H

main.cpp

#include "mywidget.h"
#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);MyWidget w;w.show();return a.exec();
}

mywidget.cpp

#include "mywidget.h"
#include "ui_mywidget.h"MyWidget::MyWidget(QWidget *parent) :QWidget(parent),ui(new Ui::MyWidget)
{ui->setupUi(this);//创建动图对象QMovie *mv = new QMovie(":/pictrue/pic1.gif");//加入标签ui->logo_lab->setMovie(mv);//启动动图mv->start();//自动适应大小ui->logo_lab->setScaledContents(true);//加入图片ui->username_lab->setPixmap(QPixmap(":/pictrue/userName.jpg"));//自动适应大小ui->username_lab->setScaledContents(true);ui->passwd_lab->setPixmap(QPixmap(":/pictrue/passwd.jpg"));ui->passwd_lab->setScaledContents(true);//设置占位ui->username_edit->setPlaceholderText("账号/邮箱/手机");ui->passwd_edti->setPlaceholderText("密码");//设置密码输入ui->passwd_edti->setEchoMode(QLineEdit::Password);//=======================信号和槽=========================//手动连接，qt4版本，取消按钮自定义槽函数关闭窗口connect(ui->cancel_btn,SIGNAL(clicked()),this,SLOT(my_close()));//手动连接，qt5版本connect(ui->login_btn,&QPushButton::clicked,this,&MyWidget::login_slot);}MyWidget::~MyWidget()
{delete ui;
}//手动连接自定义槽函数,qt4版本，关闭窗口
void MyWidget::my_close()
{this->close();
}//手动连接自定义槽函数，qt5版本，登录
void MyWidget::login_slot()
{if(ui->username_edit->text() == "admin" & ui->passwd_edti->text() == "123456"){qDebug() << "登录成功";}else {qDebug() << "登录失败";ui->passwd_edti->clear();  //登录失败清空密码栏}
}

效果图

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2.思维导图