我有一个 iPhone 应用程序，我想将其移植到 iPad，但我希望尽可能少地重复。
人们通常如何去做这件事？
在 xcode 中，您可以为 iPhone 和 iPad 设置不同的目标，并可能进行一些预处理器检查吗？或者最好干脆拥有两个独立的项目？
注意，我不是在谈论在 iPad 上运行 iPhone 应用程序，我的意思是创建一个本机 3.2 应用程序...
编辑
所以看起来创建一个通用应用程序是正确的方法：
http://developer.apple.com/iphone/library/documentation/General/Conceptual/iPadProgrammingGuide/StartingYourProject/StartingYourProject.html#//apple_ref/doc/uid/TP40009370-CH9-SW8
但我仍然不知道了解如何根据当前部署选择不同的 NIB 文件？？？
多谢
I have an iPhone app that I would like to port over to the iPad, but I would like to have as little duplication as possible.
How do people usually go about doing this?
In xcode can you have different targets for iPhone and iPad and perhaps do some pre-processor checks? Or is it best to simply have two separate projects altogether?
Note, Im NOT talking about running the iPhone app on the iPad, I mean creating a native 3.2 app...
EDIT
So it looks like creating a universal application is the way to go:
http://developer.apple.com/iphone/library/documentation/General/Conceptual/iPadProgrammingGuide/StartingYourProject/StartingYourProject.html#//apple_ref/doc/uid/TP40009370-CH9-SW8
But what I still dont understand is how to select different NIB files based on your current deployment???
Thanks a lot
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为了最大限度地减少重复，您可以使用一个项目，其中包含 2 组 .nib 文件，但一组源代码文件包括 UIUserInterfaceIdiom 差异的运行时检查。
如果您想要两个（或更多）应用程序而不是通用应用程序，只需创建两个仅包含适当的 .nib 文件的目标，并使用每个目标的构建设置中定义的预处理器宏#ifdef 运行时检查结果以强制 iPhone 或仅限 iPad 惯用语。
For minimal duplication, you can use one project, with 2 sets of .nib files, but one set of source code files which include run-time checks for the UIUserInterfaceIdiom differences.
If you want two (or more) apps instead of a Universal app, just create two targets containing only the appropriate .nib files, and #ifdef the run-time check results using a Preprocessor Macro define in each target's Build Settings to force iPhone or iPad idiom only.
最新的 (3.2.3) Xcode 自动生成一个通用项目，这是了解如何在一个 Xcode 项目中定位 iPad 和 iPhone 的一个很好的起点。
文件>新项目>基于窗口的应用程序>产品：通用The latest (3.2.3) Xcode auto-generates a Universal project which is a great starting point to see how to target iPad and iPhone in one Xcode project.
File > New Project > Window-based Application > Product : Universal