SortingLayer 允许您轻松设置多个精灵的渲染顺序。始终存在名为“Default”的默认 SortingLayer，所有精灵最初都会添加到其中。添加更多 SortingLayers 可以轻松控制精灵组的渲染顺序。图层可以位于默认图层之前或之后。
其他资源: 标签和图层。
| 图层 | 返回此项目中定义的所有图层。 |
| onLayerAdded | 添加图层时排序图层事件的委托。 |
| onLayerRemoved | 删除图层时排序图层事件的委托。 |
| id | 这是分配给图层的唯一 ID。它不是有序的运行值，不应将其用于与其他图层比较以确定排序顺序。 |
| 名称 | 返回 TagManager 中定义的图层的名称。 |
| 值 | 这是相对于其他图层指示此图层排序顺序的相对值。 |
| GetLayerValueFromID | 返回最终的排序图层值。要确定各个排序图层之间的排序顺序，请使用此方法检索最终排序值并使用 CompareTo 确定顺序。 |
| GetLayerValueFromName | 返回最终的排序图层值。其他资源: GetLayerValueFromID。 |
| IDToName | 返回图层的唯一 ID。如果给出无效 ID，则将返回“ |
| IsValid | 如果提供的 ID 是有效的图层 ID，则返回 true。 |
| NameToID | 返回给定名称的 ID。如果给出无效名称，则将返回 0。 |
| LayerCallback | 在添加或删除排序图层时调用其调用列表中的方法。 |
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