iOS 获取客户端ip

    NSString *address =@"an error occurred when obtaining ip address";

    structifaddrs *interfaces = NULL;

    structifaddrs *temp_addr = NULL;

    int success =0;

    

    success = getifaddrs(&interfaces);

    

    if (success ==0) { // 0表示获取成功

        

        temp_addr = interfaces;

        while (temp_addr !=NULL) {

            if( temp_addr->ifa_addr->sa_family ==AF_INET) {

                // Check if interface is en0 which is the wifi connection on the iPhone

                if ([[NSStringstringWithUTF8String:temp_addr->ifa_name]isEqualToString:@"en0"]) {

                    // Get NSString from C String

                    address = [NSStringstringWithUTF8String:inet_ntoa(((structsockaddr_in *)temp_addr->ifa_addr)->sin_addr)];

                }

            }

            

            temp_addr = temp_addr->ifa_next;

        }

    }

    

    freeifaddrs(interfaces);

    NSLog(@"手机的IP是：%@", address);