Qt无法加载.qrc指定字体：Qt6.11异常、Qt6.9正常

Qt可在.qrc文件中找到指定字体，且字体已被成功添加到QFontDatabase，但创建QFont对象后，实际加载的却是系统默认字体。

相关代码与配置 #

MainWindow.cpp #

#include "mainwindow.h"
#include <QFontDatabase>

MainWindow::MainWindow(QWidget *parent)
      : QMainWindow(parent)
{
      qDebug() << "DB count before adding=" << QFontDatabase::families().count();

      int fontId = QFontDatabase::addApplicationFont(":/OldaniaADFStd-Regular.otf");
      QString fontFamily = QFontDatabase::applicationFontFamilies(fontId).at(0);
      QFont font(fontFamily);

      qDebug() << "DB count after adding=" << QFontDatabase::families().count();
      qDebug() << "families=" << QFontDatabase::applicationFontFamilies(fontId);
      qDebug() << "fontId=" << fontId;
      qDebug() << "font family at families["<< fontId << "]= "<< fontFamily;
      qDebug() << "font family loaded=" << QFontInfo(font).family();
}

MainWindow::~MainWindow() = default;

fontTest.qrc #

<RCC>
      <qresource prefix="/">
            <file>OldaniaADFStd-Regular.otf</file>
      </qresource>
</RCC>

CMakeLists.txt #

#added this line at the top in order to pick up the qrc file
set(CMAKE_AUTORCC ON)

运行输出 #

DB count before adding= 177
DB count after adding= 178
families= QList("Oldania ADF Std")
fontId= 0
font family at families[ 0 ]=  "Oldania ADF Std"
font family loaded= "Noto Sans"

补充说明 #

• main.cpp与mainwindow.h为IDE默认生成内容，未做修改
• CMakeLists.txt仅添加了上述set(CMAKE_AUTORCC ON)一行
• 使用的是免费字体Oldania ADF Std
• 环境差异：在openSUSE Tumbleweed+Qt6.11环境下出现问题，openSUSE Leap+Qt6.9环境下代码可正常运行，两台设备均未安装该字体
• 已尝试的解决方法：完全重建项目、调用QFontDatabase::font方法、检查Qt Creator全局设置，均无效

现寻求该问题的原因及可行解决方案。

内容的提问来源于stack exchange，提问作者Spaceman Dan