在iOS開發(fā)過程中，集成第三方庫的時(shí)候，難免會(huì)遇到庫沖突，造成編譯通不過。

一般的做法是，修改沖突庫的類名。但是修改類名，可能就會(huì)污染第三方的代碼，不好升級和維護(hù)。

現(xiàn)在我介紹一種不直接修改類名的情況解決庫沖突的問題。

C語言中的宏預(yù)處理可以很好的解決類名沖突問題。

以AFNetworking為例，假設(shè)我們工程代碼里面有AFNetworking，第三方庫也集成了AFNetworking，編譯的時(shí)候，就會(huì)報(bào)錯(cuò)：duplicate symbol _OBJC_IVAR_$_AFHTTPSessionManager._requestSerializer

我們在工程的預(yù)處理頭文件中Prefix.h加一個(gè)宏定義

#define AFHTTPSessionManager KKAFHTTPSessionManager

在編譯過程中，編譯器在預(yù)處理階段，把AFHTTPSessionManager替換成KKAFHTTPSessionManager，編譯出來的庫里面就沒有AFHTTPSessionManager符號，只有KKAFHTTPSessionManager，也就沒有duplicate symbol了。

代碼詳單如下：

#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

#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

#define? AFURLRequestSerializationErrorDomain KKAFURLRequestSerializationErrorDomain

#define? AFURLResponseSerializationErrorDomain KKAFURLResponseSerializationErrorDomain

#define? _AFURLSessionTaskSwizzling _KKAFURLSessionTaskSwizzling