QT5 自定义 QMessageBox大小

代码如下：
QMessageBox box;
//设置文本框的大小
box.setStyleSheet("QLabel{"
                      "min-width:100px;"
                      "min-height:40px; "
                      "font-size:16px;"
                      "}");

box.setText(QString::fromLocal8Bit("请先登陆"));
box.setWindowTitle(QString::fromLocal8Bit("警告"));
box.setIcon(QMessageBox::Icon::Warning );
box.setButtonText(QMessageBox::Ok , QString::fromLocal8Bit("确定"));
box.exec();

 

样式图片：