为了访问每个 QTabBar 选项卡的每个样式，您必须覆盖 paintEvent() 方法

In order to access each style of each QTabBar tab you must overwrite the paintEvent() method of it.

执行此操作的通用方法应具有以下结构:

The generic way of doing this should have the following structure:

void paintEvent(QPaintEvent *event){
    QStylePainter painter(this);
    QStyleOptionTab opt;

    for(int index = 0; index < count(); index++)
    {
        initStyleOption(&opt,index);
        /*Here make the changes*/
        painter.drawControl(QStyle::CE_TabBarTabShape, opt);
        painter.drawControl(QStyle::CE_TabBarTabLabel,opt);
    }
}

在这一部分中，我将展示如何创建 QTabWidget 的示例，其中显示了一个闪烁的选项卡，并且只有在我们单击该选项卡时才会结束闪烁

In this part I show an example of how to create a QTabWidget where it shows a tab that blinks and only ends the blinking if we click on that tab

TabBarAlert:

class TabBarAlert : public QTabBar
{
    int indexAlert = -1;
    QColor mColor;
    Q_OBJECT
public:
    TabBarAlert(QWidget *parent = Q_NULLPTR):QTabBar(parent)
    {
        mColor = Qt::red;
    }
    void setIndexAlert(int index){
        if(indexAlert == index)
            return;
        indexAlert = index;
        update();
    }

    int getIndexAlert() const{
        return indexAlert;
    }

    QColor getColor() const{
        return mColor;
    }
    void setColor(const QColor &color){
        if(color == mColor)
            return;
        mColor = color;
        update();
    }

protected:
    void paintEvent(QPaintEvent *event){

        if(indexAlert> -1 && indexAlert < count()){
            QStylePainter painter(this);
            QStyleOptionTab opt;

            for(int i = 0;i < count();i++)
            {
                initStyleOption(&opt,i);

                if(indexAlert == i)
                    opt.palette.setColor(QPalette::Button, mColor);
                painter.drawControl(QStyle::CE_TabBarTabShape, opt);
                painter.drawControl(QStyle::CE_TabBarTabLabel,opt);
            }
        }
        else{
            QTabBar::paintEvent(event);
        }
    }

};

TabWidgetAlert:

class TabWidgetAlert : public QTabWidget
{
    TabBarAlert *tb;
    QTimer *timer;
    bool on = false;
    int indexAlert = -1;

    Q_OBJECT
public:
    TabWidgetAlert(QWidget *parent = Q_NULLPTR):QTabWidget(parent)
    {
        tb = new TabBarAlert(this);
        setTabBar(tb);
        tb->setColor(Qt::black);

        /*
        *Disable the alert if the current tab matches the alert tab.
        */
        connect(this, &TabWidgetAlert::currentChanged, [this](int index){
            if(index == tb->getIndexAlert()){
                tb->setIndexAlert(-1);
                on = false;
                timer->stop();
           }
        });

        timer = new QTimer(this);

        /*
        *Create the blink
        */
        connect(timer, &QTimer::timeout, [this](){
            tb->setIndexAlert(on? indexAlert: -1);
            on = !on;
        });
    }

    void setAlert(int index){
        indexAlert = index;
        timer->start(100);
    }
};

完整示例可在以下链接