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  "contentMarkdown": "# 如何优化UI中大量使用SetActive(true)/(false)\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在UI的日常开发中为了显示隐藏某些GO使用了大量的SetActive(true)/(false)代码,由于SetActive的开销过大是否有其他解决方案\n\n- 提问者：zyy\n- 提问时间：2021-03-26 00:32:32\n\n## 我的回答\n\n这种情况下Active/Deactive的开销主要有两个方面：\n\n- C#层到Native层的穿梭调用速度比C#层内的速度慢。\n- UI元素的变化导致所在的Canvas变化，触发函数Canvas.SendWillRenderCanvases()与Canvas.BuildBatch()造成高耗时。\n\n因此，优化也可以从以下几点考虑：\n\n1. 在C#层设置变量来标识相应的GO处于Active还是非Active状态，避免对Active的对象进行SetActive(true)，避免对非Active的对象进行SetActive(false)。\n2. 将要频繁变化的UI元素与不频繁变化的UI元素放在不同的Canvas中，减少UI元素变化时的耗时。\n3. 通过将UI元素的坐标移动到Canvas的范围之外的方法来显示与隐藏，避免SetActive的耗时以及SendWillRenderCanvases的耗时\n4. 另外，经测试，对Component进行 enabled = false 的操作比对GO进行SetActive(false)的操作耗时低。\n\n--------------------\n\n2021.3.27 更新：\n\n经题主提示，导致开销的还有一个方面：UI元素的网格顶点数组改变会造成堆内存分配，触发GC，导致耗时。不过对UI元素进行位置移动不会造成堆内存分配。\n\n优化方法增加一条：通过添加CanvasGroup组件设置透明度的方式来进行显示与隐藏。\n\n- 回答时间：2021-03-26 02:13:30\n- 最后更新：2021-03-29 02:52:36\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：UI、资源管理、UGUI、终端平台\n- 原始问题：[如何优化UI中大量使用SetActive(true)/(false)](https://answer.uwa4d.com/question/605c4aa0cfa35d5b53669c57)\n- 源页最后更新：2021-03-29 03:06:51\n"
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