头文件

#ifndef MYWIDGET_H
#define MYWIDGET_H

#include <QWidget>
#include<QDebug>
#include<QIcon>
#include<QPushButton>
#include<QLineEdit>
#include<QLabel>
#include<QMovie>
#include<QCheckBox>
#include<QPainter>

class MyWidget : public QWidget
{
    Q_OBJECT

public:
    MyWidget(QWidget *parent = nullptr);
    ~MyWidget();
};
#endif // MYWIDGET_H

main函数

#include "mywidget.h"

MyWidget::MyWidget(QWidget *parent)
    : QWidget(parent)
{
    this->resize(430, 330);
    this->setWindowIcon(QIcon("D:/tp/qq.png"));
    this->setWindowTitle("QQ");

    //背景动图
    QLabel *lab5 = new QLabel(this);
    lab5->resize(430, 125);
    QMovie *mv = new QMovie("D:/pic/1.gif");
    lab5->setMovie(mv);
    mv->start();
    lab5->setScaledContents(true);

    //账号框
    QLineEdit *ed1 = new QLineEdit(this);
    ed1->move(119,160);
    ed1->setPlaceholderText("账号");  //设置占位
    ed1->resize(230, 35);
    ed1->setStyleSheet("; border-radius: 10px;padding:2px 4px;");

    //企鹅图
    QLabel *lab6 = new QLabel(this);
    lab6->move(98, 170);
    lab6->resize(21, 20);
    lab6->setPixmap(QPixmap("D:/pic/qq.png"));
    lab6->setScaledContents(true);

    //密码框
    QLineEdit *ed3 = new QLineEdit(this);
    ed3->move(119, 200);
    ed3->setPlaceholderText("密码");  //设置占位
    ed3->resize(230, 35);
    ed3->setEchoMode(QLineEdit::Password);
    ed3->setStyleSheet("; border-radius: 10px;padding:2px 4px;");

    //锁图片
    QLabel *lab7 = new QLabel(this);
    lab7->move(98, 210);
    lab7->resize(21, 20);
    lab7->setPixmap(QPixmap("D:/pic/key.png"));
    lab7->setScaledContents(true);

    //自动登录
    QLabel *lab1 = new QLabel(this);
    lab1->setText("自动登录");
    lab1->move(123, 241);

    //复选框
    QCheckBox*box1 = new QCheckBox("Checkbox1", this);
    box1->setChecked(true);
    box1->move(105, 238);
    box1->resize(21, 20);

    //记住密码
    QLabel *lab2 = new QLabel(this);
    lab2->setText("记住密码");
    lab2->move(204, 241);
   // lab2->resize(20, 10);

    //复选框
    QCheckBox*box2 = new QCheckBox("Checkbox2", this);
    box2->setChecked(true);
    box2->move(186, 238);
    box2->resize(21, 20);

//    //插入头像
//    QLabel *lab3 = new QLabel(this);
//    lab3->move(175, 80);
//    lab3->resize(75, 75);
//    QMovie *mv2 = new QMovie("D:/pic/R-C.gif");
//    lab3->setMovie(mv2);
//    mv2->start();
//    lab3->setScaledContents(true);

    QLabel *lab9 = new QLabel(this);
    lab9->setFixedSize(75, 75);
    QPixmap pixmap("D:/pic/kl.jpg");
    pixmap = pixmap.scaled(lab9->size(), Qt::KeepAspectRatioByExpanding, Qt::SmoothTransformation);
    QPixmap roundPixmap(lab9->size());
    roundPixmap.fill(Qt::transparent);
    QPainter painter(&roundPixmap);
    painter.setRenderHint(QPainter::Antialiasing, true);
    painter.setPen(Qt::NoPen);
    painter.setBrush(Qt::white);
    painter.drawEllipse(roundPixmap.rect());
    painter.setCompositionMode(QPainter::CompositionMode_SourceIn);
    painter.drawPixmap(0, 0,pixmap);
    lab9->setPixmap(roundPixmap);
    lab9->move(175, 80);
    lab9->setScaledContents(true);

    //注册账号
    QLabel *lab4 = new QLabel(this);
    lab4->setText("注册账号");
    lab4->move(10, 300);
   // lab2->resize(20, 10);

    //登录
    QPushButton *btn1 = new QPushButton;
    btn1->setText("登录");
    btn1->setParent(this); //指定父对象
    btn1->resize(230, 35);
    btn1->move(105, 265);
    btn1->setStyleSheet("background-color: rgb(112,216,253); border-radius: 10px;padding:2px 4px;");

    //找回密码
    QPushButton *btn2 = new QPushButton(this);
    btn2->setText("找回密码");
    btn2->move(270, 237);
    btn2->resize(66, 22);

    //二维码图
    QLabel *lab8 = new QLabel(this);
    lab8->move(390, 292);
    lab8->resize(29, 29);
    lab8->setPixmap(QPixmap("D:/pic/ewm.png"));
    lab8->setScaledContents(true);

}

MyWidget::~MyWidget()
{
}