1、QT思维导图

2、自由发挥应用场景，实现登录

#include "mywidget.h"

MyWidget::MyWidget(QWidget *parent)
    : QWidget(parent)
{

    this->resize(642,493);
    this->setFixedSize(642,493);

    this->setWindowIcon(QIcon("D:/QTText/pictrue/qq.png"));
    this->setStyleSheet("background-color:white");
    this->setWindowFlag(Qt::FramelessWindowHint);

    QLabel * lab1 = new QLabel(this);
    lab1->resize(642,190);
    lab1->setStyleSheet("background-color:pink");
    QMovie *mv = new QMovie("D:/QTText/pictrue/qq.gif");
    lab1->setMovie(mv);
    mv->start();
    lab1->setScaledContents(true);

    QLabel *lab2 = new QLabel(this);
    lab2->resize(24,35);
    lab2->move(154,260);
    lab2->setPixmap(QPixmap("D:\\QTText\\pictrue\\userName.jpg"));
    lab2->setScaledContents(true);

    QLabel *lab3 = new QLabel(this);
    lab3->resize(24,35);
    lab3->move(154,313);
    lab3->setPixmap(QPixmap("D:\\QTText\\pictrue\\passwd.jpg"));
    lab3->setScaledContents(true);

    QLineEdit * edit1 = new QLineEdit(this);
    edit1->resize(335,36);
    edit1->move(180,260);
    edit1->setPlaceholderText("QQ号/手机号/邮箱");

    QLineEdit *edit2 = new QLineEdit(this);
    edit2->resize(335,36);
    edit2->move(180,313);
    edit2->setPlaceholderText("密码");
    edit2->setEchoMode(QLineEdit::Password);

    QPushButton *btn = new QPushButton("登录",this);
    btn->resize(360,45);
    btn->move(154,410);
    btn->setStyleSheet("background-color:rgb(8,189,253);border-radius:5px;color:white");

}

MyWidget::~MyWidget()
{
}