直接上代码：

#import "ViewController.h"
#import <sys/socket.h>
#import <sys/sockio.h>
#import <sys/ioctl.h>
#import <net/if.h>
#import <arpa/inet.h>

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    [self getDeviceIPAddresses];
}

- (NSString *)getDeviceIPAddresses {
    
    int sockfd =socket(AF_INET,SOCK_DGRAM, 0);
    NSMutableArray *ips = [NSMutableArray array];
    int BUFFERSIZE =4096;
    struct ifconf ifc;
    char buffer[BUFFERSIZE], *ptr, lastname[IFNAMSIZ], *cptr;
    struct ifreq *ifr, ifrcopy;
    ifc.ifc_len = BUFFERSIZE;
    ifc.ifc_buf = buffer;
    if (ioctl(sockfd,SIOCGIFCONF, &ifc) >= 0) {
        for (ptr = buffer; ptr < buffer + ifc.ifc_len; ){
            ifr = (struct ifreq *)ptr;
            int len =sizeof(struct sockaddr);
            if (ifr->ifr_addr.sa_len > len) {
                len = ifr->ifr_addr.sa_len;
            }
            ptr += sizeof(ifr->ifr_name) + len;
            if (ifr->ifr_addr.sa_family !=AF_INET) continue;
            if ((cptr = (char *)strchr(ifr->ifr_name,':')) != NULL) *cptr =0;
            if (strncmp(lastname, ifr->ifr_name,IFNAMSIZ) == 0)continue;
            memcpy(lastname, ifr->ifr_name,IFNAMSIZ);
            ifrcopy = *ifr;
            ioctl(sockfd,SIOCGIFFLAGS, &ifrcopy);
            if ((ifrcopy.ifr_flags &IFF_UP) == 0)continue;
            NSString *ip = [NSString stringWithFormat:@"%s",inet_ntoa(((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr)];
            [ips addObject:ip];
        }
    }
    
    close(sockfd);
    
    NSString *deviceIP =@"";
    
    for (int i=0; i < ips.count; i++) {
        
        if (ips.count >0) {
            
            deviceIP = [NSString stringWithFormat:@"%@",ips.lastObject];
        }
    }
    NSLog(@"deviceIP========%@",deviceIP);
    return deviceIP;
}
@end