1. QMainWindow 窗口初始最大化

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
 
    MainForm  windApp;
    windApp.showMaximized();  // 最大化
 
    return a.exec(); 
}

2. QPushButton按钮样式表

QPushButton{
    background-color: rgb(222,231,241);
    color:rgb(80,160,255);
    border-radius:10px;
    border-width: 1px;
    border-style: solid;
    border-color: rgb(255, 153, 105);
}
 
QPushButton:hover{
    background-color: rgb(111,168,255);
    color:white;
    border-color: rgb(111,168,255);
}
 
/* 按钮按下时 */
QPushButton:pressed{
    background-color: rgb(74,131,229);
    color:white;
    border-color: rgb(74,131,229);
}
 
/* 按钮不可用时 */
QPushButton:disabled{
    background-color: rgb(244,244,244);
    color: rgb(109,109,109);
    border-color: rgb(173,178,181);
}

3. 正则表达式，验证IP地址

if(ipStr.isEmpty())return;
 
QRegExp m_IPRegExp("^"
                   "((22[0-3])|(2[0-1][0-9])|(1[0-1][0-9])|(12[0-6])|(12[8-9])|(1[3-9][0-9])|([1-9][0-9]?))"
                   "\\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))"
                   "\\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))"
                   "\\.((25[0-5])|(2[0-4][0-9])|([0-1]?[0-9]?[0-9]))"
                   "$");
 
if(false == m_IPRegExp.exactMatch(ipStr))
{
    QMessageBox::information(this,"错误","输入的IP地址格式不正确！  ");
}

4. QTableWidget 表格控件

效果：

样式表：

QHeaderView::section,QTableCornerButton:section{ 
    text-align:center;
    padding:3px; 
    margin:0px; 
    color:#DCDCDC; 
    border:1px solid #124D65;
    border-left-width:0px; 
    border-right-width:1px; 
    border-top-width:0px;
     border-bottom-width:1px; 
    background:qlineargradient(spread:pad,x1:0,y1:0,x2:0,y2:1,stop:0 #629DA5,stop:1 #326D85);
}

QHeaderView::section:vertical{     /* 设置标题（垂直的） */
    /*background: transparent;*/
    padding-left: 15px;
    min-width: 30px;

}

QTableWidget::item,QTableView::item{   /* 设置视图项 */
    padding-left: 1px;
    padding-right: 1px;
    border: none;
    /*background: rgba(251,251,253,200);*/
}

QTableWidget,QTableView{
    outline: 0px;   /* 禁止焦点 */

    background:#326D85;       /* 背景颜色 */
    gridline-color:#124D65;   /* 网格线 颜色 */
    border:2px solid #326D85;
    alternate-background-color:#427285;    /* 设置间隔行的颜色，若有启用，则必须使用代码：tableWidget->setAlternatingRowColors(true); */
    color:#EFEFEF;
    text-align:center;
    font-size:14px;
}

QTableWidget:item:selected{  /* 单元格，选中状态时：渐变色 */
    color:#FFFFFF;
    background:qlineargradient(spread:pad,x1:0,y1:0,x2:0,y2:1,stop:0 #60A4BF,stop:1 #30748F);
}

QTableWidget::item:hover{   /* 单元格，鼠标悬停 */
    background:#5999B2;
}

QScrollBar:vertical{
    background:#CCCCCC; 
    padding:0px;
    border-radius:4px;
    max-width:12px;
}

QScrollBar::handle:hover:vertical,QScrollBar:handle:pressed:vertical{
    background:#30748F;
}

QScrollBar::handle:vertical{
    border-radius:4px;
    background:qlineargradient(spread:pad,x1:0,y1:0,x2:1,y2:0,stop:0 #65A9BF,stop:1 #20647F);;  /* 竖直滚动条,块 默认颜色 */
}

QScrollBar::sub-page:vertical{
    background:#CCCCCC;  /* 竖直滚动条,上半部分颜色 */
}

QScrollBar::add-page:vertical{
    background:#BBBBBB;  /* 竖直滚动条,下半部分颜色 */
}

QScrollBar::sub-line:vertical{
    background:none;
}

QScrollBar::add-line:vertical{
    background:none;
}

相关代码：

private slots:
    void cellChanged(int row,int col);

    ui->tableWidget->setColumnCount(4); // 4个列
    ui->tableWidget->setHorizontalHeaderLabels(QStringList() << "设备标识" << "设备类型" << "通讯方式" << "通讯地址");
    ui->tableWidget->setRowCount(33);   // 33行

    ui->tableWidget->resize(700,450);
    ui->tableWidget->setColumnWidth(0,100);  // 列宽
    ui->tableWidget->setColumnWidth(1,100);
    ui->tableWidget->setColumnWidth(2,90);
    // ui->tableWidget->setColumnWidth(3,260);
    ui->tableWidget->horizontalHeader()->setStretchLastSection(true); //设置充满表宽度
    ui->tableWidget->setAlternatingRowColors(true); // 允许 改变行颜色
    ui->tableWidget->setSelectionBehavior(QAbstractItemView::SelectRows);  // 单击 选中整行
    ui->tableWidget->setSelectionMode(QAbstractItemView::SingleSelection); // 只能选中1行，不能多选
    // ui->tableWidget->setEditTriggers(QAbstractItemView::NoEditTriggers);   // 设置全都不可编辑

    // 添加 数据显示
    for(int i=0; i < 33; i++){
        DeviceConfig dc = _DeviceMgr->getConfig(i);

        ui->tableWidget->setItem(i,0,new QTableWidgetItem(dc.getDeviceId()));
        ui->tableWidget->setItem(i,1,new QTableWidgetItem(dc.getDeviceTypeStr()));
        ui->tableWidget->setItem(i,2,new QTableWidgetItem(dc.getDriverType()));
        ui->tableWidget->setItem(i,3,new QTableWidgetItem(dc.getIpPort()));

        // 前3列的 每一个单元格，居中对齐
        ui->tableWidget->item(i,0)->setTextAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
        ui->tableWidget->item(i,1)->setTextAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
        ui->tableWidget->item(i,2)->setTextAlignment(Qt::AlignHCenter | Qt::AlignVCenter);

        ui->tableWidget->item(i,0)->setFlags(Qt::ItemIsEnabled | Qt::ItemIsSelectable);
        ui->tableWidget->item(i,1)->setFlags(Qt::ItemIsEnabled | Qt::ItemIsSelectable);
        ui->tableWidget->item(i,2)->setFlags(Qt::ItemIsEnabled | Qt::ItemIsSelectable);
        ui->tableWidget->item(i,3)->setFlags(Qt::ItemIsEnabled | Qt::ItemIsSelectable | Qt::ItemIsEditable ); // 设置此单元格可以编辑
    }

    // 绑定 信号-槽
    connect(ui->tableWidget,    &QTableWidget::cellChanged,     this,   &DeviceManagerDlg::cellChanged                          );