AFNetworking/AFNetworkReachabilityManager.h
第一步 找到 @param address The socket address (`sockaddr_in`) used to evaluate network reachability. 这句话
修改： (`sockaddr_in`) ------> (`sockaddr_in6`)
第二步： 找到 + (instancetype)sharedManager 这个方法
由 struct sockaddr_in address;
bzero(&address, sizeof(address));
address.sin_len = sizeof(address);
address.sin_family = AF_INET; 这几句修改成：
#if (defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && __IPHONE_OS_VERSION_MIN_REQUIRED >= 90000) || (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED >= 101100)
struct sockaddr_in6 address;
bzero(&address, sizeof(address));
address.sin6_len = sizeof(address);
address.sin6_family = AF_INET6;
#else
struct sockaddr_in address;
bzero(&address, sizeof(address));
address.sin_len = sizeof(address);
address.sin_family = AF_INET;
#endif
