1.获取本机局域网地址

• 头文件

//首先导入头文件信息
#include <ifaddrs.h>
#include <arpa/inet.h>
#include <net/if.h>

• 方法

+ (NSString *)IPAddress;{
    NSString *address = @"0.0.0.0";
    struct ifaddrs *interfaces = NULL;
    struct ifaddrs *XZHDX_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
        XZHDX_addr = interfaces;
        while (XZHDX_addr != NULL) {
            if( XZHDX_addr->ifa_addr->sa_family == AF_INET) {
                // Check if interface is en0 which is the wifi connection on the iPhone
                if ([[NSString stringWithUTF8String:XZHDX_addr->ifa_name] isEqualToString:@"en0"]) {
                    // Get NSString from C String
                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)XZHDX_addr->ifa_addr)->sin_addr)];
                }
            }
            
            XZHDX_addr = XZHDX_addr->ifa_next;
        }
    }
    
    // Free memory
    freeifaddrs(interfaces);
    
    return address;
}

2.获取互联网IP地址

+ (NSString *)IPAddress
{
    NSURL *ipURL = [NSURL URLWithString:@"http://ip.taobao.com/service/getIpInfo.php?ip=myip"];
    NSData *data = [NSData dataWithContentsOfURL:ipURL];
    NSDictionary *ipDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
    NSString *ipStr = nil;
    if (ipDic && [ipDic[@"code"] integerValue] == 0) { //获取成功
        ipStr = ipDic[@"data"][@"ip"];
    }
    return (ipStr ? ipStr : @"");
}

参考：https://blog.csdn.net/txz_gray/article/details/53217293