如何在运行时启用/禁用视网膜显示支持？
我们需要提供一个在 iPhone4 上使用视网膜显示屏的应用程序，但在 iPod Touch 上不使用，但我能找到的控制本机分辨率的唯一方法是应用程序描述符中的 requestsDisplayResolution 标记。
有没有办法使用 Actionscript 或本机扩展在运行时更改此设置？
We need to deliver a single app which uses the retina display on the iPhone4 but not the iPod Touch, but the only way I can find to control the native resolution is the requestedDisplayResolution tag in the app descriptor.
Is there a way to change this at runtime using Actionscript or a native extension?
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我希望此时您已经找到了问题的答案。但我会在这里为那些像我和你一样在写这篇文章时毫无头绪的人留下一个答案:)
这是对我有用的解决方案：在 app-description.xml 中从高分辨率中排除 iPad3
希望它对您有用，就像对我有用一样；）
I hope, by this time, you already have found the answer for your question. But I'll leave here an answer for those whom got here without a clue like me and you when you wrote it :)
This is the solution that worked for me: Exclude the iPad3 from high resolution in the app-description.xml
Hope it works for you as the same it worked for me ;)
你不知道。您没有理由想要降低 iPod Touch 用户的体验。如果您的意思是在旧版本的设备和新版本的设备之间（如非视网膜和视网膜），设备/应用程序会为您完成此操作。除 OpenGL 应用程序外，无需手动切换显示分辨率。这是一个完全不同的野兽……
话虽这么说，如果您的显示器降级有一些基本的、迫切的需要，请详细解释一下。如果这对应用程序的功能至关重要，苹果可能会允许。但是，如果只是针对 Lite 版本/类似的东西，他们很可能会拒绝该应用程序。
You don't. There's no reason why you would want to degrade the experience for iPod Touch users. If you mean between older versions of the devices and newer (as in non-Retina and Retina), the device/app does it for you. There's no need to manually switch display resolutions except for OpenGL apps. And that's a totally different beast…
That being said, if there's some essential, compelling need for your display degradation, explain it more. If it's essential to the functioning of the app, Apple will probably allow it. However, if it is solely for a Lite version/something like that, it's likely they'll reject the app.