iPhone：是否值得再开发支持 OS 2.2 的应用程序？
新的操作系统（3.0+）添加了更多加快开发速度的功能（例如使用列表等）。另一方面，可能（可能）有很多用户仍在运行 OS 2.2。
有什么地方可以查统计数据吗？有人可以为计划于圣诞节发布的新 iPhone 应用程序的目标操作系统提供建议吗？
The new OS (3.0+) adds more features which speed up the development (like working with the lists etc). On the other hand there could be (potentially) a lot of users somewhere still running OS 2.2.
Is there any place to look for statistics? Could someone offer an advice on the target OS for a new iPhone app scheduled for Christmas release?
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根据 Admob 数据，早期 SDK 版本的采用率在过去一直相当不错。需要几个月的时间才能达到 60% 以上的采用率。请参阅 Admob 统计信息
另一方面，我只是我们看到另一份 Admob 报告，该报告表明 iPod Touch 用户更有可能购买应用程序，但不太可能升级。
不过，如果您需要 3.0 SDK 中的某些内容，我打赌圣诞市场和明年会推出 3.0。
Based on Admob data, adoption rates of the earlier SDK releases have been pretty good in past. It takes a couple of months to reach over 60% adoption. See Admob stats
On the otherhand, I just saw another Admob report, which indicated that iPod Touch users are more likely to buy apps and they are not that likely to upgrade.
However, I'd bet on 3.0 for Christmas market and next year, if you need something from 3.0 SDK.
鉴于此数据，如果您仅支持 iPhone，则有没有理由不去3.0而已。如果 iPod touch 是您受众的重要组成部分，那么可能会做出更艰难的决定。
不过，我敢打赌，愿意为您的应用程序付费的人们也愿意为他们的 iPod touch 支付 3.0 升级费用，这样他们就可以获得最新、最好的应用程序。
最后，在我看来，如果出于开发原因对 3.0 具有重大吸引力，我会说继续使用。我目前正在编写一个 3.0 iPhone 应用程序，预计将在接下来的几周内发布，我什至没有考虑 2.x - Core Data 对我来说太有吸引力了，尽管我可以通过以下方式实现持久性： SQLite。
Given this data, if you're only supporting iPhones there's no reason not to go 3.0 only. If iPod touches are an important part of your audience, it may by a harder decision.
However, I'd wager that the people willing to pay for your app are also willing to pay for the 3.0 upgrade for their iPod touch, so they can get the latest and greatest app.
Finally, in my opinion, if there's a significant draw to 3.0 for development reasons, I'd say go for it. I'm writing a 3.0 iPhone app at the moment, due for release in the next few weeks, and I didn't even consider 2.x - Core Data is too much of a draw for me, even though I can achieve persistence with SQLite.
这取决于。如果您想利用新功能，则必须使用 SDK 3，如果不需要它们，您可以坚持使用旧功能。
在我看来，用户坚持使用旧软件的问题有两个根源：
It depends. If you want to take the advantage of the new features you must use the SDK 3, if you don't need them you can just stick to the old one.
The problem why users stick to old soft has two sources in my opinion: