qt_qml_singleton_type
将 QML 文件标记为提供单例类型。
该属性在 Qt 6.2 中引入。
提供单例类型的.qml 文件需要将其QT_QML_SINGLETON_TYPE source 属性设置为TRUE ，以确保单例命令被写入qmldir文件。除了包含pragma Singleton 语句的 QML 文件外，还必须这样做。源属性必须在创建单例所属模块之前设置。
有关如何设置QT_QML_SINGLETON_TYPE 属性的示例，请参阅qt_target_qml_sources()。
另请参阅 qt_target_qml_sources。
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