qt实现登录界面

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    //设置纯净窗口
    this->setWindowFlag(Qt::FramelessWindowHint);
    //重新设置窗口的大小以及不可改变
    this->resize(533,450);
    this->setFixedSize(533,450);
    //接收动图并设置
    QMovie *mv=new QMovie(":/homework/2013dade60710e6f719a008dc47138b7.gif");
    //设置标签里面的动图以及自己适应
    ui->BackPicture->resize(533,200);
    ui->BackPicture->setMovie(mv);
    mv->start();
    ui->BackPicture->setScaledContents(true);
    //设置底层的背景图，当按下登录后隐藏背景1
   ui->BackPicture_2->resize(533,200);
    ui->BackPicture_2->setPixmap(QPixmap(":/homework/5a51f62e8b1d6961e7a6e663a9c4e14.jpg"));
    ui->BackPicture->setScaledContents(true);
    //设置输入框旁边的图标
    ui->Qicon->resize(50,50);
    ui->Qicon->move(100,230);

   ui->Qicon->setPixmap(QPixmap(":/homework/OIP-C.jpg"));
   ui->Qicon->setScaledContents(true);//设置图片适应图标
    ui->Qicon_2->resize(50,50);
    ui->Qicon_2->move(100,280);
   ui->Qicon_2->setPixmap(QPixmap(":/homework/R-C.jfif"));
   ui->Qicon_2->setScaledContents(true);//设置图片适应图标
   //设置用户名行编辑器
    ui->UserName->resize(300,50);
    ui->UserName->move(150,230);
     ui->UserName->setPlaceholderText("喵喵账号");
     //设置密码行编辑器
      ui->Passwd->resize(300,50);
       ui->Passwd->move(150,280);
       ui->Passwd->setPlaceholderText("喵喵密码");
        ui->Passwd->setEchoMode(QLineEdit::Password);
        //设置登录按钮
        ui->LoginBut->resize(50,50);
        ui->LoginBut->move(200,340);
        ui->LoginBut->setStyleSheet("background-color:pink;border-radius:25px");
        ui->LoginBut->setText("登录");
        //设置注册按钮
        ui->ReginBut->resize(50,50);
        ui->ReginBut->move(280,340);
        ui->ReginBut->setStyleSheet("background-color:rgb(156,222,251);border-radius:25px");
        ui->ReginBut->setText("注册");

}

MainWindow::~MainWindow()
{
    delete ui;
}

按下登录按钮，隐藏背景1