我有一个源文件，实际上它是一个 Google API 库。
它在 GTLCommon_Sources.m 上有这个代码:
#if defined(__has_feature) && __has_feature(objc_arc)
#error "This file needs to be compiled with ARC disabled."
#endif
#import "Objects/GTLBatchQuery.m"
#import "Objects/GTLBatchResult.m"
#import "Objects/GTLDateTime.m"
#import "Objects/GTLErrorObject.m"
#import "Objects/GTLObject.m"
#import "Objects/GTLQuery.m"
#import "Objects/GTLRuntimeCommon.m"
#import "Objects/GTLService.m"
#import "Objects/GTLUploadParameters.m"
#import "Utilities/GTLBase64.m"
#import "Utilities/GTLFramework.m"
#import "Utilities/GTLJSONParser.m"
#import "Utilities/GTLUtilities.m"
但是，尝试构建它，结果是 GTLCommon_Sources 和 GTLJSONParser 上的重复符号。我尝试将源文件更改为 #import "Utilities/GTLJSONParser.h" 而不是 #import "Utilities/GTLJSONParser.m" 并且重复符号错误消失了。
谁能告诉我为什么这个库会导入一个 .m 文件？在 AFAIK 中，我们总是导入 .h 文件。
这只是构建所有源文件的便捷方式，无需将所有源文件都包含在您的项目中。见 the documentation .
Rather than link to the GTL framework, you can compile the GTL library sources directly into your own project. To do this, find the library's GTLCommon_Sources.m and GTLCommon_Networking.m files, and drag the files into your project's window.
Then add the library's source folders to the Header Search Paths entry of your project's build settings: Source, Source/Objects, Source/Utilities, Deps/gtm-session-fetcher/Source, Deps/gtm-oauth2/Source, Deps/gtm-oauth2/Source/Touch (or Deps/gtm-oauth2/Source/Mac).
为此，请不要将任何其他来源(GTLBatchQuery.m 等)添加到您的项目中。
关于ios - 为什么要导入 .m 文件？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37560704/
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