编码时捕获NS_AVAILABLE_IOS [英] Catching NS_AVAILABLE_IOS while coding

问题描述

我知道如何更改支持的最低操作系统IPHONEOS_DEPLOYMENT_TARGET 。我目前正在使用Xcode 4.5开发并使用iOS 6.0 SDK。

I know how to change the lowest OS supported with IPHONEOS_DEPLOYMENT_TARGET. I am currently developing under Xcode 4.5 and using the iOS 6.0 SDK.

我想要做的是找到一种方法在编译时发出警告，每当我使用代码时标记为：
NS_AVAILABLE_IOS（6_0）

What I'd like to do is find a way to throw a warning in compilation whenever I use code that is marked: NS_AVAILABLE_IOS(6_0)

这样我就可以确保我不会错过任何是的，但你在iOS 5上所以不要使用此代码会导致用户设备崩溃的区域。

So that I can make sure that I don't miss any "Yes, but you're on iOS 5 so don't use this code" areas that will crash the user's device.

推荐答案

NS_AVAILABLE_IOS（6_0 ）当SDK低于6.0时，被定义为 __属性（（不可用））但是当SDK为6.0或更高版本时，它被定义为空。

NS_AVAILABLE_IOS(6_0) is defined as __attribute((unavailable)) when the SDK is lower that 6.0… but is defined as nothing when the SDK is 6.0 or greater.

因此，只要您使用SDK 6.0进行编译，您就可以在概念上 #define NS_AVAILABLE_IOS（6_0）/ * noop * / 所以你将无法检测到任何东西。

So as long as you compile with the SDK 6.0, you will have conceptually #define NS_AVAILABLE_IOS(6_0) /* noop */ so you won't be able to detect anything.

唯一的选择是重新定义 IPHONE_OS_VERSION_MAX_ALLOWED 欺骗编译器并让它认为它使用较旧的SDK，但我甚至不确定它是否可能o在 NSObjCRuntime.h 和 AvailabilityMacros.h 标题之前很快重新定义它。

The only option is to redefine IPHONE_OS_VERSION_MAX_ALLOWED to trick the compiler and make it think it uses an older SDK, but i am not even sure that it is possible to redefine it soon enough before the NSObjCRuntime.h and AvailabilityMacros.h headers are included.

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