本文介绍了一种在iOS应用开发中遇到的特定编译错误，该错误与未定义的符号有关，尤其涉及到Security框架中的多个函数。通过简单地将Security.framework添加到项目中，即可解决这些链接时出现的问题。
Undefined symbols for architecture armv7:
"_SecTrustGetCertificateCount", referenced from:
-[AFURLConnectionOperation connection:willSendRequestForAuthenticationChallenge:] in AFURLConnectionOperation.o
"_SecTrustGetCertificateAtIndex", referenced from:
-[AFURLConnectionOperation connection:willSendRequestForAuthenticationChallenge:] in AFURLConnectionOperation.o
"_SecCertificateCopyData", referenced from:
-[AFURLConnectionOperation connection:willSendRequestForAuthenticationChallenge:] in AFURLConnectionOperation.o
"_SecCertificateCreateWithData", referenced from:
___44+[AFURLConnectionOperation pinnedPublicKeys]_block_invoke in AFURLConnectionOperation.o
"_SecPolicyCreateBasicX509", referenced from:
___44+[AFURLConnectionOperation pinnedPublicKeys]_block_invoke in AFURLConnectionOperation.o
-[AFURLConnectionOperation connection:willSendRequestForAuthenticationChallenge:] in AFURLConnectionOperation.o
"_SecTrustCreateWithCertificates", referenced from:
___44+[AFURLConnectionOperation pinnedPublicKeys]_block_invoke in AFURLConnectionOperation.o
-[AFURLConnectionOperation connection:willSendRequestForAuthenticationChallenge:] in AFURLConnectionOperation.o
"_SecTrustEvaluate", referenced from:
___44+[AFURLConnectionOperation pinnedPublicKeys]_block_invoke in AFURLConnectionOperation.o
-[AFURLConnectionOperation connection:willSendRequestForAuthenticationChallenge:] in AFURLConnectionOperation.o
"_SecTrustCopyPublicKey", referenced from:
___44+[AFURLConnectionOperation pinnedPublicKeys]_block_invoke in AFURLConnectionOperation.o
-[AFURLConnectionOperation connection:willSendRequestForAuthenticationChallenge:] in AFURLConnectionOperation.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Base SDK6.1上编译出现此错误
需要添加一个Security.framework 就OK了
如何添加framework，参考：
XCODE4.x添加FrameWork，proj-build phases-link binary with libraries-add
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