QT设置窗口边框圆角及样式失效

1. 　直接设置样式    setStyleSheet("border:5px solid red;border-radius:10px")

2. 　this->setAttribute(Qt::WA_TranslucentBackground);//设置窗口背景透明

　　this->setWindowFlags(Qt::FramelessWindowHint); //设置无边框窗口 

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void SystemWarnDialog::paintEvent(QPaintEvent *event) {     QPainter painter(this);     painter.setRenderHint(QPainter::Antialiasing);  // 反锯齿;     painter.setBrush(QBrush(Qt::gray));     painter.setPen(Qt::transparent);     QRect rect = this->rect();     rect.setWidth(rect.width() - 1);     rect.setHeight(rect.height() - 1);     painter.drawRoundedRect(rect, 15, 15);//也可用QPainterPath 绘制代替     // painter.drawRoundedRect(rect, 15, 15);     // {     //     QPainterPath painterPath;     //     painterPath.addRoundedRect(rect, 15, 15);     //     p.drawPath(painterPath);     // }     QWidget::paintEvent(event); }

3. 　主窗体加载不了样式时需要在paintEvent事件中加上如下代码：

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{     QStyleOption opt;     opt.init(this);     QPainter p(this);     style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);     QWidget::paintEvent(event); }