QML different style using QGuiApplication and QCoreApplication

[bronstein87]

When i using QML in QCoreApplication all widgets have poor style:
Slider in QGuiApplication:

In QCoreApplication:

Button in QGuiApp:

Button in QCoreApp:

Is there a way to resolve this problem?

[jpnurmi]

With QApplication from QtWidgets you get a QStyle-based "Desktop" style. With QGuiApplication from QtGui, it is not possible to use QtWidgets so you get a QML-based "Base" style instead. You can specify QT_QUICK_CONTROLS_STYLE environment variable if you want to choose a specific style. Make sure to do it before loading any QML.

QT_QUICK_CONTROLS_STYLE=Base ./app

or in code:

int main(...)
{
    qputenv("QT_QUICK_CONTROLS_STYLE", "Base");
    ...
}