当编译AFNetworking 2.0时出现了Undefined symbols for architecture i386

转：http://www.cnblogs.com/xiongqiangcs/p/3449531.html

当将AFNetworking添加到工程后编译时出现

Undefined symbols for architecture i386:
  "_SecCertificateCopyData", referenced from:
      _AFCertificateTrustChainForServerTrust in AFSecurityPolicy.o
  "_SecCertificateCreateWithData", referenced from:
      _AFPublicKeyForCertificate in AFSecurityPolicy.o
  "_SecPolicyCreateBasicX509", referenced from:
      _AFPublicKeyForCertificate in AFSecurityPolicy.o
      _AFPublicKeyTrustChainForServerTrust in AFSecurityPolicy.o
  "_SecTrustCopyPublicKey", referenced from:
      _AFPublicKeyForCertificate in AFSecurityPolicy.o
      _AFPublicKeyTrustChainForServerTrust in AFSecurityPolicy.o
  "_SecTrustCreateWithCertificates", referenced from:
      _AFPublicKeyForCertificate in AFSecurityPolicy.o
      _AFPublicKeyTrustChainForServerTrust in AFSecurityPolicy.o
  "_SecTrustEvaluate", referenced from:
      _AFPublicKeyForCertificate in AFSecurityPolicy.o
      _AFServerTrustIsValid in AFSecurityPolicy.o
      _AFPublicKeyTrustChainForServerTrust in AFSecurityPolicy.o
  "_SecTrustGetCertificateAtIndex", referenced from:
      _AFCertificateTrustChainForServerTrust in AFSecurityPolicy.o
      _AFPublicKeyTrustChainForServerTrust in AFSecurityPolicy.o
  "_SecTrustGetCertificateCount", referenced from:
      _AFCertificateTrustChainForServerTrust in AFSecurityPolicy.o
      _AFPublicKeyTrustChainForServerTrust in AFSecurityPolicy.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

此时需要导入3个frameworks

CFNetwork.framework
Security.framework
SystemConfiguration.framework

 我在将AFNetworking 2.0添加到cocos2d的工程项目时，首席必须将与AFNetworking 2.0有关的文件都变成ARC，具体步骤

 Edit-》Refactor-》Convert to Objective-c ARC...，然后将与AFNetworking 2.0有关的文件选上，继续就行

编译时还可能出现“The current deployment target does not support automated __weak references”，此时需要将__weak变成__unsafe_unretained

还可能在

@property (nonatomic, strong) dispatch_queue_t completionQueue;

出现Property with 'retain(or strong)' attribute must be of object type错误，此时将上面变成

@property (nonatomic, assign) dispatch_queue_t completionQueue;

就可以编译通过

如果感觉麻烦可以试着先创建Application的工程，然后将AFNetwork 2.0添加进去，此时编译不会报错，然后再将cocos2d添加进去

按照cocos2d中的AppDelegate修改一下AppDelegate的内容即可，此方法有待尝试