rotate in QState

I know that if I want animate roatation have to do (this is part of my code):

Code:

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QState *state = new QState(parent);
        state->assignProperty(objects.at(i), "geometry", selectedRect);
	state->assignProperty(objects.at(i), "rotation", 45);

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objets - QObjectList of instance of my class that inherits QGraphicsWidget

I want to make rotation for example by the Z-axis.
I know that with QGraphicsWidget i can use setTransform(QTransform().rotate(180, Qt::ZAxis)) but I have no idea how to make this in QState. thanks for help