优雅的解决iOS第三方库冲突

在iOS开发过程中，集成第三方库的时候，难免会遇到库冲突，造成编译通不过。

一般的做法是，修改冲突库的类名。但是修改类名，可能就会污染第三方的代码，不好升级和维护。

现在我介绍一种不直接修改类名的情况解决库冲突的问题。

C语言中的宏预处理可以很好的解决类名冲突问题。

以AFNetworking为例，假设我们工程代码里面有AFNetworking，第三方库也集成了AFNetworking，编译的时候，就会报错：duplicate symbol _OBJC_IVAR_$_AFHTTPSessionManager._requestSerializer

我们在工程的预处理头文件中Prefix.h加一个宏定义

#define AFHTTPSessionManager KKAFHTTPSessionManager

在编译过程中，编译器在预处理阶段，把AFHTTPSessionManager替换成KKAFHTTPSessionManager，编译出来的库里面就没有AFHTTPSessionManager符号，只有KKAFHTTPSessionManager，也就没有duplicate symbol了。

代码详单如下：

#define AFHTTPSessionManager KKAFHTTPSessionManager

#define AFNetworkReachabilityManager KKAFNetworkReachabilityManager

#define AFSecurityPolicy KKAFSecurityPolicy

#define AFURLRequestSerialization KKAFURLRequestSerialization

#define AFURLResponseSerialization KKAFURLResponseSerialization

#define AFURLSessionManager KKAFURLSessionManager

#define AFHUDNotificationObserver KKAFHUDNotificationObserver

#define AFHTTPRequestSerializer KKAFHTTPRequestSerializer

#define AFJSONRequestSerializer KKAFJSONRequestSerializer

#define AFPropertyListRequestSerializer KKAFPropertyListRequestSerializer

#define AFQueryStringPair KKAFQueryStringPair

#define AFStreamingMultipartFormData KKAFStreamingMultipartFormData

#define AFMultipartBodyStream KKAFMultipartBodyStream

#define AFHTTPBodyPart KKAFHTTPBodyPart

#define AFHTTPResponseSerializer KKAFHTTPResponseSerializer

#define AFJSONResponseSerializer KKAFJSONResponseSerializer

#define AFXMLParserResponseSerializer KKAFXMLParserResponseSerializer

#define AFXMLDocumentResponseSerializer KKAFXMLDocumentResponseSerializer

#define AFPropertyListResponseSerializer KKAFPropertyListResponseSerializer

#define AFImageResponseSerializer KKAFImageResponseSerializer

#define AFCompoundResponseSerializer KKAFCompoundResponseSerializer

#define AFURLSessionManagerTaskDelegate KKAFURLSessionManagerTaskDelegate

#define AFStringFromNetworkReachabilityStatus KKAFStringFromNetworkReachabilityStatus

#define AFNetworkingReachabilityDidChangeNotification KKAFNetworkingReachabilityDidChangeNotification

#define AFNetworkingReachabilityNotificationStatusItem KKAFNetworkingReachabilityNotificationStatusItem

#define AFQueryStringPairsFromDictionary KKAFQueryStringPairsFromDictionary

#define ErrorDomain KKErrorDomain

#define AFQueryStringPairsFromKeyAndValue KKAFQueryStringPairsFromKeyAndValue

#define AFNetworkingTaskDidCompleteErrorKey KKAFNetworkingTaskDidCompleteErrorKey

#define AFNetworkingTaskDidCompleteResponseSerializerKey KKAFNetworkingTaskDidCompleteResponseSerializerKey

#define AFNetworkingTaskDidCompleteAssetPathKey KKAFNetworkingTaskDidCompleteAssetPathKey

#define AFNetworkingTaskDidCompleteSerializedResponseKey KKAFNetworkingTaskDidCompleteSerializedResponseKey

#define AFNetworkingTaskDidCompleteResponseDataKey KKAFNetworkingTaskDidCompleteResponseDataKey

#define AFNetworkingTaskDidCompleteNotification KKAFNetworkingTaskDidCompleteNotification

#define AFURLSessionDidInvalidateNotification KKAFURLSessionDidInvalidateNotification

#define AFNetworkingTaskDidResumeNotification KKAFNetworkingTaskDidResumeNotification

#define AFURLSessionDownloadTaskDidFailToMoveFileNotification KKAFURLSessionDownloadTaskDidFailToMoveFileNotification

#define AFNetworkingTaskDidSuspendNotification KKAFNetworkingTaskDidSuspendNotification

#define _AFURLSessionTaskSwizzling _KKAFURLSessionTaskSwizzling

#define AFNetworkingOperationFailingURLResponseErrorKey KKAFNetworkingOperationFailingURLResponseErrorKey

#define AFNetworkingOperationFailingURLResponseDataErrorKey KKAFNetworkingOperationFailingURLResponseDataErrorKey