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  "contentMarkdown": "# UI在使用SpriteAtlas时的原理，以及打AB包的时候SpriteAtlas的“冗余”问题\n\n> [!note] 我的 UWA 问答\n> 本文收录我在 UWA 问答发表的公开回答。问题内容归原提问者；回答保留当时语境，技术结论可能受 Unity 版本、平台和项目条件限制。\n\n## 问题\n\n我之前对SpriteAtlas的理解是，UI在渲染的时候会根据关联的Sprite信息找到对应的SpriteAtlas，这样每个UI渲染都用了同样的Atlas，这样可以减少DrawCall。\n\n所以理论上来讲，应该只需要Atlas这一张图就好了。\n\n可为什么我看到打Atlas的AB包里除了Atlas图还有引用的原图。在UI的AB包里，也有引用的原图。\n\n请问为什么有这样的“冗余”，以及到底Image引用的是图集还是图片，原理是什么？\n\n谢谢~\n\n- 提问者：安日天\n- 提问时间：2021-04-29 03:41:46\n\n## 我的回答\n\n不过确实存在一个冗余的问题：如果prefab1和prefab2引用了同一个atlas的sprite，那么这个atlas至少要主动包含在一个AB中，否则会被动打入两个包中，造成冗余。\n\natlas没有设置AB包：\n\n![image.png](assets/608949fa6bb31032f9791494/01.png)\n\n![image.png](assets/608949fa6bb31032f9791494/02.png)\n\natlas打到其中一个AB包中：\n\n![image.png](assets/608949fa6bb31032f9791494/03.png)\n\n![image.png](assets/608949fa6bb31032f9791494/04.png)\n\n- 回答时间：2021-04-30 06:17:56\n- 最后更新：2021-04-30 07:25:22\n- 采纳状态：未采纳\n\n## 来源与关系\n\n- 上位集合：[[10-计算机、信息技术与工程/05-游戏图形与运行时/我的UWA问答/我的UWA问答|我的 UWA 问答]]\n- UWA 标签：资源管理、UI、UGUI\n- 原始问题：[UI在使用SpriteAtlas时的原理，以及打AB包的时候SpriteAtlas的“冗余”问题](https://answer.uwa4d.com/question/608949fa6bb31032f9791494)\n- 源页最后更新：2021-04-30 06:17:56\n"
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