由控制 RectTransforms 布局的组件实现的基接口。
如果组件驱动自己的 RectTransform，则应实现接口 ILayoutSelfController。
如果组件驱动其子项的 RectTransform，则应实现 ILayoutGroup。
布局系统会首先调用 SetLayoutHorizontal，然后调用 SetLayoutVertical。
在 SetLayoutHorizontal 调用中，对自己或其任何子项的 RectTransform 调用 LayoutUtility.GetMinWidth、LayoutUtility.GetPreferredWidth 和 LayoutUtility.GetFlexibleWidth 是有效的。
在 SetLayoutVertical 调用中，对自己或其任何子项的 RectTransform 调用 LayoutUtility.GetMinHeight、LayoutUtility.GetPreferredHeight 和 LayoutUtility.GetFlexibleHeight 是有效的。
组件可以使用此信息确定将宽度和高度用于其自己的 RectTransform 还是子项的 RectTransform。
| SetLayoutHorizontal | 由处理布局水平方面的自动布局系统调用的回调。 |
| SetLayoutVertical | 由处理布局垂直方面的自动布局系统调用的回调。 |
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