QPropertyAnimation use of undeclared identifier rotation 怎么处理

"rotation" is not a predefined property in the QPropertyAnimation class. To resolve this error, you need to specify a valid property of the target object that you want to animate.

Here is an example of how to use QPropertyAnimation to animate the rotation property of a QGraphicsItem:

QGraphicsItem* item = ...; // Your QGraphicsItem object
QPropertyAnimation* animation = new QPropertyAnimation(item, "rotation");

animation->setDuration(1000); // Animation duration in milliseconds
animation->setStartValue(0); // Start rotation value
animation->setEndValue(360); // End rotation value

animation->start(); // Start the animation

In this example, we are animating the "rotation" property of a QGraphicsItem. Make sure to replace item with your actual QGraphicsItem object.

If you want to animate a different property, you need to replace "rotation" with the desired property name. You can check the documentation of the target object to find the available properties that you can animate.