법일

#import   
#import   
  
  
  
// Get IP Address  
- (NSString *)getIPAddress {      
    NSString *address = @"error";  
    struct ifaddrs *interfaces = NULL;  
    struct ifaddrs *temp_addr = NULL;  
    int success = 0;  
    // retrieve the current interfaces - returns 0 on success  
    success = getifaddrs(&interfaces);  
    if (success == 0) {  
        // Loop through linked list of interfaces  
        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([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {  
                    // Get NSString from C String  
                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];                 
                }  
            }  
            temp_addr = temp_addr->ifa_next;  
        }  
    }  
    // Free memory  
    freeifaddrs(interfaces);  
    return address;  
  
}   

법2

#include   
#include   
#include   
  
#define IOS_CELLULAR    @"pdp_ip0"  
#define IOS_WIFI        @"en0"  
//#define IOS_VPN       @"utun0"  
#define IP_ADDR_IPv4    @"ipv4"  
#define IP_ADDR_IPv6    @"ipv6"  
  
- (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];  
  
    // retrieve the current interfaces - returns 0 on success  
    struct ifaddrs *interfaces;  
    if(!getifaddrs(&interfaces)) {  
        // Loop through linked list of interfaces  
        struct ifaddrs *interface;  
        for(interface=interfaces; interface; interface=interface->ifa_next) {  
            if(!(interface->ifa_flags & IFF_UP) /* || (interface->ifa_flags & IFF_LOOPBACK) */ ) {  
                continue; // deeply nested code harder to read  
            }  
            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 || addr->sin_family==AF_INET6)) {  
                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;  
                    }  
                } else {  
                    const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6*)interface->ifa_addr;  
                    if(inet_ntop(AF_INET6, &addr6->sin6_addr, addrBuf, INET6_ADDRSTRLEN)) {  
                        type = IP_ADDR_IPv6;  
                    }  
                }  
                if(type) {  
                    NSString *key = [NSString stringWithFormat:@"%@/%@", name, type];  
                    addresses[key] = [NSString stringWithUTF8String:addrBuf];  
                }  
            }  
        }  
        // Free memory  
        freeifaddrs(interfaces);  
    }  
    return [addresses count] ? addresses : nil;  
}