QMainWindow title can't be removed on iOS

[ivazhu]

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QMainWindow w;

    w.setWindowFlags(Qt::CustomizeWindowHint);
    w.setStyleSheet("background-color:red;");

    QWidget *ce = new QWidget(&w);
    {
        QRect screenGeometry = QGuiApplication::primaryScreen()->geometry();
        int screenHeight = screenGeometry.height();
        int screenWidth = screenGeometry.width();

        w.setFixedWidth(screenWidth);
        w.setFixedHeight(screenHeight);

        ce->setFixedWidth(screenWidth);
        ce->setFixedHeight(screenHeight);

        ce->setStyleSheet("background-color:blue;");
    }


    w.setCentralWidget(ce);
    w.show();

    return a.exec();
}

The result on iPhone 12pro is:

There is no any red on Desktop (as expected).

Qt::FramelessWindowHint doesn't work also.

Does anyone have idea how to deal with it?

[JoeCFD]

@ivazhu I guess for phone apps QML is preferred.