Undefined symbols for architecture i386:

  "_SecItemAdd", referenced from:

      +[SFHFKeychainUtils storeUsername:andPassword:forServiceName:updateExisting:error:] in SFHFKeychainUtils.o

  "_SecItemCopyMatching", referenced from:

      +[SFHFKeychainUtils getPasswordForUsername:andServiceName:error:] in SFHFKeychainUtils.o

  "_SecItemDelete", referenced from:

      +[SFHFKeychainUtils deleteItemForUsername:andServiceName:error:] in SFHFKeychainUtils.o

  "_SecItemUpdate", referenced from:

      +[SFHFKeychainUtils storeUsername:andPassword:forServiceName:updateExisting:error:] in SFHFKeychainUtils.o

  "_kSecAttrAccount", referenced from:

      +[SFHFKeychainUtils getPasswordForUsername:andServiceName:error:] in SFHFKeychainUtils.o

      +[SFHFKeychainUtils storeUsername:andPassword:forServiceName:updateExisting:error:] in SFHFKeychainUtils.o

      +[SFHFKeychainUtils deleteItemForUsername:andServiceName:error:] in SFHFKeychainUtils.o

  "_kSecAttrLabel", referenced from:

      +[SFHFKeychainUtils storeUsername:andPassword:forServiceName:updateExisting:error:] in SFHFKeychainUtils.o

  "_kSecAttrService", referenced from:

      +[SFHFKeychainUtils getPasswordForUsername:andServiceName:error:] in SFHFKeychainUtils.o

      +[SFHFKeychainUtils storeUsername:andPassword:forServiceName:updateExisting:error:] in SFHFKeychainUtils.o

      +[SFHFKeychainUtils deleteItemForUsername:andServiceName:error:] in SFHFKeychainUtils.o

  "_kSecClass", referenced from:

      +[SFHFKeychainUtils getPasswordForUsername:andServiceName:error:] in SFHFKeychainUtils.o

      +[SFHFKeychainUtils storeUsername:andPassword:forServiceName:updateExisting:error:] in SFHFKeychainUtils.o

      +[SFHFKeychainUtils deleteItemForUsername:andServiceName:error:] in SFHFKeychainUtils.o

  "_kSecClassGenericPassword", referenced from:

      +[SFHFKeychainUtils getPasswordForUsername:andServiceName:error:] in SFHFKeychainUtils.o

      +[SFHFKeychainUtils storeUsername:andPassword:forServiceName:updateExisting:error:] in SFHFKeychainUtils.o

      +[SFHFKeychainUtils deleteItemForUsername:andServiceName:error:] in SFHFKeychainUtils.o

  "_kSecReturnAttributes", referenced from:

      +[SFHFKeychainUtils getPasswordForUsername:andServiceName:error:] in SFHFKeychainUtils.o

      +[SFHFKeychainUtils deleteItemForUsername:andServiceName:error:] in SFHFKeychainUtils.o

  "_kSecReturnData", referenced from:

      +[SFHFKeychainUtils getPasswordForUsername:andServiceName:error:] in SFHFKeychainUtils.o

  "_kSecValueData", referenced from:

      +[SFHFKeychainUtils storeUsername:andPassword:forServiceName:updateExisting:error:] in SFHFKeychainUtils.o

解決辦法：targets——>build phases——>link binary with libraries——>Security.framework