原文是ios纯代码实现：http://www.jianshu.com/p/0797097c3559
我根据需要改了下代码，因为只是用于本地RN调试使用，上线了打离线包是不用ip的

导入

#include <ifaddrs.h>
#include <arpa/inet.h>
#include <net/if.h>

#define IOS_CELLULAR    @"pdp_ip0"
#define IOS_WIFI        @"en0"
#define IOS_VPN         @"utun0"
#define IP_ADDR_IPv4    @"ipv4"
#define IP_ADDR_IPv6    @"ipv6"

代码

#pragma 获取本地ip
- (NSString *)getIPAddress:(BOOL)preferIPv4
{
  NSArray *searchArray = preferIPv4 ?
  @[ IOS_VPN @"/" IP_ADDR_IPv4, IOS_VPN @"/" IP_ADDR_IPv6, IOS_WIFI @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR_IPv6 ] :
  @[ IOS_VPN @"/" IP_ADDR_IPv6, IOS_VPN @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6, IOS_WIFI @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4 ] ;
  
  NSDictionary *addresses = [self getIPAddresses];
//  NSLog(@"addresses: %@", addresses);
  
  __block NSString *address;
  [searchArray enumerateObjectsUsingBlock:^(NSString *key, NSUInteger idx, BOOL *stop)
   {
     address = addresses[key];
     if(address) *stop = YES;
   } ];
  return address ? address : @"0.0.0.0";
}
- (NSDictionary *)getIPAddresses
{
  NSMutableDictionary *addresses = [NSMutableDictionary dictionaryWithCapacity:8];
  
  struct ifaddrs *interfaces;
  if(!getifaddrs(&interfaces)) {
   
    struct ifaddrs *interface;
    for(interface=interfaces; interface; interface=interface->ifa_next) {
      if(!(interface->ifa_flags & IFF_UP)  ) {
        continue;
      }
      const struct sockaddr_in *addr = (const struct sockaddr_in*)interface->ifa_addr;
      char addrBuf[ MAX(INET_ADDRSTRLEN, INET6_ADDRSTRLEN) ];
      if(addr && (addr->sin_family==AF_INET)) {
        NSString *name = [NSString stringWithUTF8String:interface->ifa_name];
        NSString *type;
        if(addr->sin_family == AF_INET) {
          if(inet_ntop(AF_INET, &addr->sin_addr, addrBuf, INET_ADDRSTRLEN)) {
            type = IP_ADDR_IPv4;
          }
        }
        if(type) {
          NSString *key = [NSString stringWithFormat:@"%@/%@", name, type];
          addresses[key] = [NSString stringWithUTF8String:addrBuf];
        }
      }

    }
       freeifaddrs(interfaces);
  }
  return [addresses count] ? addresses : nil;
}

使用

//模式一 =>模拟器测试模式
  NSString *ipString = [NSString stringWithFormat:@"http://%@:8081/index.ios.bundle?platform=ios&dev=true",[self getIPAddress:YES]];
  jsCodeLocation = [NSURL URLWithString:ipString];