Xcode 有没有办法警告新的 API 调用? [英] Is there a way for Xcode to warn about new API calls?

问题描述

我不止一次看到 iOS 3.x 上出现崩溃错误，原因是使用了 4.x 中引入的新调用而没有进行适当的检查.

On more than one occasion I've seen crashing bugs appear on iOS 3.x due to use of a new call that was introduced in 4.x without proper checking.

Xcode 是否可以针对仅在部署目标之后版本可用的类、方法和过程发出警告?

Is there a way for Xcode to warn about classes, methods and procedures that are only available a later version than the deployment target?

这样我就可以轻松地列出所有代码并确保它被适当地条件化.

That way I could easily list through all the code and make sure it's properly conditionalized.

推荐答案

经过挖掘AvailabilityInternal.h，我意识到部署目标之上的所有可用版本都标有 __AVAILABILITY_INTERNAL_WEAK_IMPORT 宏.

因此，我可以通过重新定义该宏来生成警告:

Therefore, I can generate warnings by redefining that macro:

#import <Availability.h>
#undef  __AVAILABILITY_INTERNAL_WEAK_IMPORT
#define __AVAILABILITY_INTERNAL_WEAK_IMPORT 
    __attribute__((weak_import,deprecated("API newer than Deployment Target.")))

通过将此代码放置在项目的预编译头文件中，任何在受支持的最低 iOS 版本上使用可能导致崩溃的 API 现在都会生成警告.如果您正确保护呼叫，您可以禁用专门针对该呼叫的警告(Apple 的 SDK 兼容性指南):

By placing this code in a project's precompiled header, any use of an API that might cause a crash on the lowest supported iOS version now generates a warning. If you correctly guard the call, you can disable the warning specifically for that call (modified exmaple from Apple's SDK Compatibility Guide):

#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
    if ([UIPrintInteractionController class]) {
        // Create an instance of the class and use it.
    }
#pragma GCC diagnostic warning "-Wdeprecated-declarations"
    else {
        // Alternate code path to follow when the
        // class is not available.
    }

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