将 CoreAnimation 导出到视频文件
我在 iPhone 上使用 Core Animation 编写了一个基本的动画框架。它具有暂停和恢复动画的功能，还可以在指定时间运行动画。我的基本问题是我找不到将动画导出到视频文件（.mov、.avi 等）的方法。我已阅读有关 AVAssetWriter 和 AVComposition 的内容，但无法理解如何使它们在我的情况下工作。
通过在互联网上搜索，我能够得到的最接近的是通过逐帧阅读我的动画。即使对于它，我也找不到一种方法让它工作，也找不到 iPhone SDK 是否有办法在我的情况下实现这种逐帧读取。我也接近了这个stackoverflow上的问题，但仍然可以不明白（抱歉，如果我觉得我是这些事情的初学者，但我不是，只是无法理解一些事情）
如果有人知道如何使其工作，甚至如何做类似的事情，请分享。如果没有办法，那么如果您知道任何其他方法，即使用 OpenGL ES 而不是 CoreAnimation，也请分享。
I wrote a basic animation framework using Core Animation on iPhone. It has the functionality for pause and resume of animations and also can run animations at specified time. My basic problem is that I cannot find a way to export my animations to a video file (.mov, .avi etc). I have read about AVAssetWriter and AVComposition but cannot understand how to make them work in my case.
By searching the internet the closest I was able to get was it by doing frame by frame reading of my animations. Even for it I could not find a way to make it work and could not find that whether iPhone SDK have something to do that for this kind of frame by frame reading in my case. I also came close to this question on stackoverflow and still could not figure out (sorry if I feel that I am beginner in those things, but I am not, just could not understand some things)
If anyone know how to make it work or even how to something similar to it please share. And if there is no way then if you know any other way to do i.e using OpenGL ES instead of CoreAnimation please share it too.
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检查此演示文稿：http://www.slideshare.net/无效名称/advanced-media-manipulation-with-av-foundation
在第 84 页左右，他谈到了向视频作品添加动画。我相信这会帮助您获得您需要的东西。
Check this presentation: http://www.slideshare.net/invalidname/advanced-media-manipulation-with-av-foundation
Around page 84 he talks about adding animation to video compositions. I believe this will help you get what you need.