我想将propertyAnimation中的graphicsOpacityEffect用于包含带有像素映射标签的QFrame。我的代码是：
eff = QGraphicsOpacityEffect(frame)
widget.setGraphicsEffect(eff)
animation = QPropertyAnimation(eff, b"opacity")
animation.setStartValue(0)
animation.setEndValue(1)
animation.setDuration(500)
animation.setEasingCurve(QEasingCurve.InBack)
animation.start(QPropertyAnimation.DeleteWhenStopped)
一切正常，但是当我将标签悬停在标签上时，图像消失了，并且得到如下警告：
QPainter::setWorldTransform: Painter not active
QPainter::setWorldTransform: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.
QPainter::translate: Painter not active
QPainter::worldTransform: Painter not active
QWidgetEffectSourcePrivate::pixmap: Painter not active
QPainter::worldTransform: Painter not active
QPainter::setWorldTransform: Painter not active
QPainter::setWorldTransform: Painter not active
QPainter::begin: A paint device can only be painted by one painter at a time.