PySide2 "QAnimationGroup::animationAt: index is out of bounds" 警告

Question

我正在使用 PySide2，以下示例脚本生成了警告：QAnimationGroup::animationAt: index is out of bounds.

from PySide2 import QtCore

def add_animation(banner):
    anim1 = QtCore.QPropertyAnimation(None, "geometry")
    anim2 = QtCore.QPropertyAnimation(None, "geometry")
    banner.addAnimation(anim1)
    banner.addAnimation(anim2)

banner_animation = QtCore.QSequentialAnimationGroup(None)
add_animation(banner_animation)
# This is the line that generates the warning:
banner_animation.clear()

似乎如果我向组中添加多个动画并尝试清除它们，我会收到警告。添加单个动画不会导致警告。我已经使用 QT 版本 5.12、5.13 和 5.14 进行了测试。

这是一个错误还是我在这里做了一些奇怪的事情？

Answer 1

啊，我想这可能是垃圾回收问题。 anim1 和 anim2 对象正在被收集，因为它们在方法退出时被清除，但 Qt 仍然持有对它们的引用。以下作品例如：

from PySide2 import QtCore

def add_animation(banner):
    anim1 = QtCore.QPropertyAnimation(None, "geometry")
    anim2 = QtCore.QPropertyAnimation(None, "geometry")
    banner.addAnimation(anim1)
    banner.addAnimation(anim2)
    return anim1, anim2

banner_animation = QtCore.QSequentialAnimationGroup(None)
anim1, anim2 = add_animation(banner_animation)

banner_animation.clear()

PySide2 "QAnimationGroup::animationAt: index is out of bounds" 警告

PySide2 "QAnimationGroup::animationAt: index is out of bounds" warning

qt5

pyside2