There was qtquickcontrols2.conf in the root directory of my app sources with the following content:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | ; This file can be edited to change the style of the application; See Styling Qt Quick Controls 2 in the documentation for details:[Controls];Style=Default;Style=Universal;Style=MaterialStyle=Fusion;Style=iOS[Universal]Theme=LightAccent=Steel[Material];Theme=LightTheme=Dark;Accent=BlueGrey;Primary=BlueGray |
But I removed it and added the following line into my source code:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | #include <QGuiApplication>#include <QQmlApplicationEngine>#include <QQuickStyle>int main(int argc, char *argv[]){ QGuiApplication app(argc, argv); QQuickStyle::setStyle("Fusion"); QQmlApplicationEngine engine; engine.load(QUrl("qrc:/main.qml")); return app.exec();} |
Also I removed qtquickcontrols2.conf from CMakeLists.txt:
1 2 3 4 5 6 | qt_add_resources(${PROJECT_NAME} "icons" PREFIX "/" FILES ${ICON_FILES} qtquickcontrols2.conf) |
but added Qt6::QuickControls2.
After that I realized that the style can be set with environment variables that is probably better because it does not require qtquickcontrols2 to be linked explicitly.
I am not sure it is a QT bug or not, but when I clear app data on an Android device with Dark theme and restart the app I get this:
Can QML caching in Qt 5.8 be disabled for a particular project?
https://stackoverflow.com/questions/41922581/can-qml-caching-in-qt-5-8-be-disabled-for-a-particular-project
Add QML_DISABLE_DISK_CACHE (set to 1) to your environment variables. You should be able to do it inside your application via qputenv — put it somewhere in main before loading QML content.
Styling Qt Quick Controls
https://doc.qt.io/qt-6/qtquickcontrols-styles.html