在为iPhone编译时，Xcode设置了哪些#defines [英] What #defines are set up by Xcode when compiling for iPhone

问题描述

我正在编写一些半便携式代码，希望能够检测到我在为iPhone编译时的情况。所以我想要像 #ifdef IPHONE_SDK ... 。

I'm writing some semi-portable code and want to be able to detect when I'm compiling for iPhone. So I want something like #ifdef IPHONE_SDK....

据推测，Xcode定义了一些东西，但我在项目属性下看不到任何东西，谷歌也没什么帮助。

Presumably Xcode defines something, but I can't see anything under project properties, and Google isn't much help.

推荐答案

它位于有条件地编译源代码下的SDK文档中

It's in the SDK docs under "Compiling source code conditionally"

相关定义为TARGET_OS_IPHONE（并且他已弃用TARGET_IPHONE_SIMULATOR），在iOS框架中的/usr/include/TargetConditionals.h中定义。在早期版本的工具链中，你必须写：

The relevant definitions are TARGET_OS_IPHONE (and he deprecated TARGET_IPHONE_SIMULATOR), which are defined in /usr/include/TargetConditionals.h within the iOS framework. On earlier versions of the toolchain, you had to write:

#include "TargetConditionals.h"

但当前（xCode 6 / iOS8）工具链不再需要这样做。

but this is no longer necessary on the current (xCode 6/iOS8) toolchain.

因此，例如，如果您只想构建一个代码块，那么您应该这样做

So, for example, if you want to only compile a block of code if you are building for the device, then you should do

#if !(TARGET_OS_SIMULATOR)
...
#endif

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