1.效果图

 

2.代码

#include "widget.h"
#include "ui_widget.h"
#include <QApplication>
#include <QWidget>
#include <QtWidgets>

Widget::Widget(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    this->setWindowTitle("时光机");
    //更改界面尺寸
    this->resize(800,600);//重新设置尺寸的函数
    this->resize(QSize(400,500));//使用重载的函数重新设计尺寸，参数是一个匿名对象

    this->setFixedSize(500,700);

    //去掉组建上部的头

    //添加图标
    this->setWindowIcon(QIcon("C:\\Users\\Owner\\Desktop\\华清\\图标\\Disco.png"));

    //使用样式表更改颜色
    this->setStyleSheet("background-color:#FF69B4;");

    QLabel *label1 = new QLabel(this);
    label1->setGeometry(140,90,200,200);
    QPixmap pixmap;
    pixmap.load("C:\\Users\\Owner\\Desktop\\华清\\图标\\太空兔1.png");
    label1->setPixmap(pixmap);
    label1->setScaledContents(true);
    label1->setStyleSheet("QLabel{border-radius: 100%;background-color:#F3FEB0;}");


    QLineEdit *input1=new QLineEdit(this);
    input1->setGeometry(100,350,300,50);
    input1->setStyleSheet("QLineEdit{font:20px;color:#FF69B4;background-color:#F3FEB0;border-radius: 10px;border:none;padding-left:10px;}");
    input1->setPlaceholderText("Please enter account");
    input1->setMaxLength(6);

    //验证-给输入框加输入限制
    QRegExpValidator validator(QRegExp("[A-Za-z0-9_]+"), input1);
    input1->setValidator(&validator);

    //图标-给输入框内加图标
    QAction *searchAction1 = new QAction(input1);
    searchAction1->setIcon(QIcon("C:\\Users\\Owner\\Desktop\\华清\\图标\\头像.png"));
    input1->addAction(searchAction1,QLineEdit::LeadingPosition);

    QLineEdit *input2=new QLineEdit(this);
    input2->setGeometry(100,430,300,50);
    input2->setStyleSheet("QLineEdit{font:20px;color:#FF69B4;background-color:#F3FEB0;border-radius: 10px;border:none;padding-left:10px;}");
    input2->setPlaceholderText("Please enter password");
    input2->setEchoMode(QLineEdit::Password);
    input2->setMaxLength(8);
    // 创建一个 QRegExpValidator，并设置正则表达式和父对象

    QAction *searchAction2 = new QAction(input2);
    searchAction2->setIcon(QIcon("C:\\Users\\Owner\\Desktop\\华清\\图标\\mima.png"));
    input2->addAction(searchAction2,QLineEdit::LeadingPosition);

    QPushButton *btn1=new QPushButton(QIcon("C:\\Users\\Owner\\Desktop\\华清\\图标\\Dingdong.png"),"LOGIN",this);
    btn1->setGeometry(100,550,300,50);
    btn1->setStyleSheet("QPushButton{font:20px;color:#FF69B4;background-color:#F3FEB0;border-radius: 10px;font-weight:bold;letter-spacing: 8px;}");

}

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