在父画布的状态发生更改时调用。
当父画布被启用或禁用或者嵌套画布的 OverrideSorting 发生更改时,系统会调用此函数。例如,您可以使用此函数来修改画布下的对象(这可能取决于父画布)- 例如,如果画布被禁用,您可能需要停止对 UI 元素的某些处理。
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