我们还应该支持 iOS 4 吗？
现在，iOS 5 已发布并与 iPhone 3GS 和 iPhone 3 兼容。 up，我们还应该支持iOS 4吗？
Now that iOS 5 is out and compatible with iPhone 3GS & up, should we still support iOS 4?
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一般的经验法则是，如果您想与 Apple 保持尽可能接近的边缘，那么您就支持当前和以前的版本。这意味着，对于 iOS 5，您将继续支持 iOS 4，直到 iOS 6 发布。
The general rule of thumb is if you want to live as close to the edge with Apple that you support the current and previous releases. That means with iOS 5 in the wild that you continue to support iOS 4 until iOS 6 is released.
如果不需要 iOS 5 特定功能，那么可以。拥有 iPhone 3G 和旧版 iPod Touch 的用户将无法升级到 iOS5。此外，所有应用程序用户迁移到 iOS5 所需的时间也存在滞后。
If iOS 5 specific features aren't needed, then YES. People with iPhone 3G's and older iPod Touches won't be able to upgrade to iOS5. Also, there is a lag in how long it takes for the entire population of app users to migrate to iOS5.
是的，根据 Read Write Web 的数据，已有 2500 万人更新到了 iOS5，这只是根据 2011 年 3 月的文章。
Yes, according to Read Write Web, 25 million people have updated to iOS5, which is only about 25% according to an article from March 2011.
绝对不是，仍然有大量用户在运行 iOS 4.0，而且 iOS 5.0 能做的事情也没有 iOS 4.0 做不到的。
Definitely NOT, there is still a ton of users running iOS 4.0, besides there isn't that much that you can do with iOS 5.0 that you can't with iOS 4.0