**Undefined symbols for architecture armv7:
"_kSecValueData", referenced from:
[WXOMTAKeyChain save:data:] in libWeChatSDK.a(MTAKeyChain.o)

"_kSecReturnData", referenced from: +[WXOMTAKeyChain load:] in libWeChatSDK.a(MTAKeyChain.o)

"_SecItemCopyMatching", referenced from: +[WXOMTAKeyChain load:] in libWeChatSDK.a(MTAKeyChain.o)

"_kSecClass", referenced from:
[WXOMTAKeyChain getKeychainQuery:] in libWeChatSDK.a(MTAKeyChain.o)

"_kSecMatchLimit", referenced from:
+[WXOMTAKeyChain load:] in libWeChatSDK.a(MTAKeyChain.o) "_kSecClassGenericPassword", referenced from: +Undefined symbols for architecture armv7:
"_kSecValueData", referenced from: +[WXOMTAKeyChain save:data:] in libWeChatSDK.a(MTAKeyChain.o)

"_kSecReturnData", referenced from: +[WXOMTAKeyChain load:] in libWeChatSDK.a(MTAKeyChain.o)

"_SecItemCopyMatching", referenced from: +[WXOMTAKeyChain load:] in libWeChatSDK.a(MTAKeyChain.o)

"_kSecClass", referenced from: +
[WXOMTAKeyChain getKeychainQuery:] in libWeChatSDK.a(MTAKeyChain.o)

"_kSecMatchLimit", referenced from: +[WXOMTAKeyChain load:] in libWeChatSDK.a(MTAKeyChain.o)

"_kSecClassGenericPassword", referenced from: +[WXOMTAKeyChain getKeychainQuery:] in libWeChatSDK.a(MTAKeyChain.o)

"_kSecAttrService", referenced from: +[WXOMTAKeyChain getKeychainQuery:] in libWeChatSDK.a(MTAKeyChain.o)

"_kSecMatchLimitOne", referenced from: +[WXOMTAKeyChain load:] in libWeChatSDK.a(MTAKeyChain.o)

"_kSecAttrAccount", referenced from: +[WXOMTAKeyChain getKeychainQuery:] in libWeChatSDK.a(MTAKeyChain.o)

"_kSecAttrAccessibleAfterFirstUnlock",
referenced from:
+[WXOMTAKeyChain getKeychainQuery:] in libWeChatSDK.a(MTAKeyChain.o)

"_kSecAttrAccessible", referenced from: +[WXOMTAKeyChain getKeychainQuery:] in libWeChatSDK.a(MTAKeyChain.o)

"_SecItemDelete", referenced from: +[WXOMTAKeyChain save:data:] in libWeChatSDK.a(MTAKeyChain.o)

+[WXOMTAKeyChain delete:] in libWeChatSDK.a(MTAKeyChain.o)

"_SecItemAdd", referenced from: +[WXOMTAKeyChain save:data:] in libWeChatSDK.a(MTAKeyChain.o)

ld: symbol(s) not found for architecture armv7 clang:
error: linker command failed with exit code 1 (use -v to see invocation)
**

解决办法：
添加库文件：Security.framework