iOS Dev on Snow Leopard vs. Lion：我会失去任何功能吗？
我正在考虑将 iOS 开发作为一种爱好，并且希望尽可能节省一些钱。我有机会以便宜的价格从家庭成员那里购买第一代 Intel MacBook，虽然我并不特别关心速度（或 Xcode 以外的软件），但维基百科告诉我该型号不支持狮子。维基百科还告诉我，Xcode 4.3 仅适用于 Lion，尽管从这里的其他问题来看，iOS 5 SDK 似乎可以在 Xcode 4.2 上运行。
我的问题是，将自己限制在 Xcode 4.2 中是否会失去有意义的功能？作为 PowerMac G5 的“骄傲”拥有者，我真的不想让自己陷入在不久的将来必须花更多钱才能继续使用相关软件的境地。
I'm considering starting iOS development as a hobby and would like to save some money if possible. I've got an opportunity to pick up a first-gen Intel MacBook from a family member for cheap, and while I'm not especially concerned about the speed (or software other than Xcode), Wikipedia tells me this model can't support Lion. Wikipedia also tells me that Xcode 4.3 is only available for Lion, though from other questions on here, it seems that the iOS 5 SDK will work on Xcode 4.2.
My question is, am I losing meaningful functionality by limiting myself to Xcode 4.2? As the "proud" owner of a PowerMac G5, I really don't want to put myself in a situation where I'm going to have to spend more money in the near future just to continue using relevant software.
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阅读发行说明，似乎需要 Xcode 4.3 才能运行 5.1 版（或更高版本，尽管该版本尚未发布）的 iOS 设备。只要您习惯使用 iOS 中的现有功能，就无需担心，因为您仍然可以下载现有 iOS 版本的所有 SDK。
在某些时候，iOS 版本中可能会出现一些功能 >您想要的目标是 5.1，并且您需要升级到可以运行 Lion 的较新的开发计算机。与此同时，有大量的 API 可供您使用，无需担心。
Reading the release notes, it appears that Xcode 4.3 is required to target iOS devices running version 5.1 (or greater, although that version hasn't shipped yet). So long as you're comfortable using the existing functionality in iOS, you have nothing to worry about, as you can still download all the SDKs for existing iOS versions.
At some point there will probably be features in iOS versions > 5.1 that you'll want to target, and you will need to upgrade to a newer development machine that can run Lion for that. In the meantime, there are PLENTY of APIs available that you can play with and there isn't much to worry about.
是的，iOS 5 SDK 可以在 Snow Leopard 上安装并与 Xcode 4.2 一起使用。但是，如果 Apple 选择在 Xcode 4.3 中使用 Lion，您将无法合并 iOS 5.1 及更高版本的新功能。这对于您的客户来说将是一个巨大的问题，就像您的应用程序在未来的 iOS 更新下停止工作一样，您将无法修复它。
从技术上讲，目前 Xcode 4.2 for Lion 和 Xcode 4.2 for Snow Leopard 的功能没有任何区别（据我所知）。然而，在相对较新的未来，苹果公司需要 Lion 是一个不可避免的问题。就我个人而言，我会购买一台新的 Macbook，或者至少是更新的一台。
Yes, the iOS 5 SDK can be installed and used with Xcode 4.2 on Snow Leopard. However, if Apple chooses to require Lion for Xcode 4.3, you will not be able to incorporate new features from iOS 5.1 and later. This will be a huge problem for your customers, as if your app stops working under a future iOS update, you will be unable to fix it.
Technically, right now there is no difference between the Xcode 4.2 for Lion and Xcode 4.2 for Snow Leopard functionality wise (as far as I know). There is however the inevitable problem of Apple requiring Lion in the relatively new future. Personally, I would buy a new Macbook, or at least a more recent one.