升级到 Xcode 4.5 后，iOS 5 SDK 消失了

问题描述

我将 Xcode 升级到 4.5 版.现在所有的偏好都被重置为出厂设置——编辑器字体、颜色等——但这不是我最关心的问题.

I upgraded Xcode to version 4.5. Now all of the preferences are reset back to factory settings - editor fonts, colors, etc - but this is not my biggest concern.

看来我所针对的 iOS SDK 5.1 现在已经不存在了.在项目的构建设置中，我只能在最新 iOS (iOS 6.0)"和iOS 6.0"之间选择 Base SDK.是否可以恢复以前安装的 SDK?

It seems the iOS SDK 5.1 I was targeting is now gone. In project's build settings I can only choose Base SDK between "Latest iOS (iOS 6.0)" and "iOS 6.0". Is it possible to recover the previous installed SDKs?

推荐答案

当前的 Xcode 版本仅附带最新的 iOS SDK(很遗憾，但我们无法更改).此外，Apple 建议始终使用最新的 SDK 来构建应用程序，并将部署目标"设置为您计划支持的最低版本.

Current Xcode versions come only with the latest iOS SDK (which is a pity, but we cannot change it). Also Apple recommends to always use the latest SDK for building apps, and setting the "Deployment Target" to the minimum version that you plan to support.

您可以将 SDK(例如 iPhoneOS5.1.sdk)从旧版 Xcode 复制到

You can copy an SDK (e.g. iPhoneOS5.1.sdk) from an older Xcode to

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs

它会出现在构建设置中.但是您稍后可能会在使用此配置时遇到问题.

and it will appear in the build settings. But you might run into problems later with this configuration.

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