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

问题描述

我不止一次看到崩溃的错误出现在iOS 3.x上，原因是使用了4.x中引入的新调用而没有经过适当的检查。

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.

有没有办法让XCode警告只有比部署目标更新版本的类，方法和程序？

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

这样我就可以轻松列出通过所有代码并确保它被正确地条件化。

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

推荐答案

在挖掘 AvailabilityInternal.h ，我意识到上述所有可用版本部署目标使用 __ AVAILABILITY_INTERNAL_WEAK_IMPORT 宏进行标记。

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.")))

通过将此代码放在项目的预编译头文件中，任何使用可能导致支持最低的iOS版本崩溃的API现在都会生成警告。如果您正确保护呼叫，您可以专门为该呼叫禁用警告（从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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