xcode 是否有等效于 MAC_OS_X_VERSION_MIN_REQUIRED 的 iPhone？
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Is there an iPhone equivalent of MAC_OS_X_VERSION_MIN_REQUIRED?
提问by Daniel Dickison
I would like to conditionally include code for an iPhone app depending on which version of the SDK I'm compiling against. On Mac OS X, there is the MAC_OS_X_VERSION_MIN_REQUIREDpreprocessor macro which gets set to the value of the MACOSX_DEPLOYMENT_TARGETbuild setting by the compiler. Is there an equivalent on the iPhone?
我想根据我正在编译的 SDK 版本有条件地包含 iPhone 应用程序的代码。在 Mac OS X 上，有一个MAC_OS_X_VERSION_MIN_REQUIRED预处理器宏，它被MACOSX_DEPLOYMENT_TARGET编译器设置为构建设置的值。iPhone 上有类似的吗？
Update:
更新：
I've set IPHONE_DEPLOYMENT_TARGETto 3.0 in the build settings, but Xcode is passing -D__IPHONE_OS_VERSION_MIN_REQUIRED=20000and -mmacosx-version-min=10.5to GCC. Shouldn't the first one be 30000and the second one be -miphoneos-version-min=3.0? What am I doing wrong?
我IPHONE_DEPLOYMENT_TARGET在构建设置中设置为 3.0，但 Xcode 正在传递-D__IPHONE_OS_VERSION_MIN_REQUIRED=20000并传递-mmacosx-version-min=10.5给 GCC。第一个不应该30000是第二个-miphoneos-version-min=3.0吗？我究竟做错了什么？
Update 2:
更新 2：
Looks like I wasn't doing anything wrong. __IPHONE_OS_VERSION_MIN_REQUIREDand -miphoneos-version-minare both set correctly when building for a device -- it's only wrong when using the iPhone Simulator SDK. I think it's a bug in the simulator SDK.
看来我没有做错什么。 __IPHONE_OS_VERSION_MIN_REQUIRED并且-miphoneos-version-min在为设备构建时都正确设置 - 只有在使用 iPhone Simulator SDK 时才会出错。我认为这是模拟器 SDK 中的一个错误。
回答by cdespinosa
See Availability.h
请参阅可用性.h
#if __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_2_0
etc.
等等。
回答by Brent Royal-Gordon
There are preprocessor macros that are defined for each version of the OS. For example, if __IPHONE_OS_3_0is defined, then you're building against the 3.0 SDK (or possibly later, I'm not certain).
有为操作系统的每个版本定义的预处理器宏。例如，如果__IPHONE_OS_3_0定义了，那么您是针对 3.0 SDK 构建的（或者可能稍后，我不确定）。
回答by Daniel Dickison
For what it's worth, a decent work-around if such a macro does not exist, is to create 2 build targets, and in one of them add the build setting GCC_PREPROCESSOR_DEFINITIONSwith a value like IPHONE_OS_3. Then in your code you can do:
对于它的价值，如果这样的宏不存在，一个不错的解决方法是创建 2 个构建目标，并在其中一个添加构建设置GCC_PREPROCESSOR_DEFINITIONS，其值为IPHONE_OS_3. 然后在您的代码中，您可以执行以下操作：
#ifdef IPHONE_OS_3
[foo thisMethodIsUnderNDA];
#else
[foo oldSchoolMethod];
#endif
