以前做過獲取設備IP地址的功能，但是由于當時代碼管理不當棠绘，很多代碼已經(jīng)遺失氧苍，現(xiàn)在只能重新過一遍泛范，也讓自己更有基情激情的學習。網(wǎng)上關于這方面的文章很多赡突，但是找到自己真正需要的卻不容易，經(jīng)過幾番周折浪南。終于在著名的stackoverflow上面找到了我想要的答案漱受。
代碼如下：

#import <ifaddrs.h>
#import <arpa/inet.h>
#import <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"


#pragma mark - 獲取設備當前網(wǎng)絡IP地址
+ (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];
         //篩選出IP地址格式
         if([self isValidatIP:address]) *stop = YES;
     } ];
    return address ? address : @"0.0.0.0";
}

+ (BOOL)isValidatIP:(NSString *)ipAddress {
    if (ipAddress.length == 0) {
        return NO;
    }
    NSString *urlRegEx = @"^([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
    "([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
    "([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
    "([01]?\\d\\d?|2[0-4]\\d|25[0-5])$";
    
    NSError *error;
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:urlRegEx options:0 error:&error];
    
    if (regex != nil) {
        NSTextCheckingResult *firstMatch=[regex firstMatchInString:ipAddress options:0 range:NSMakeRange(0, [ipAddress length])];
        
        if (firstMatch) {
            NSRange resultRange = [firstMatch rangeAtIndex:0];
            NSString *result=[ipAddress substringWithRange:resultRange];
            //輸出結果
            NSLog(@"%@",result);
            return YES;
        }
    }
    return NO;
}

+ (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;
}

2017年01月11日
很多朋友說這個方法只能獲取到內(nèi)網(wǎng)IP虐先，無法獲取公網(wǎng)IP，確實撰洗，這邊補充下獲取公網(wǎng)IP方式般眉。

//方法一：
NSError *error; 
NSURL *ipURL = [NSURL URLWithString:@"http://ifconfig.me/ip"];
NSString *ip = [NSString stringWithContentsOfURL:ipURL encoding:NSUTF8StringEncoding error:&error];
//方法二：個人推薦用這個請求潜支，速度比較快
/*
http://ipof.in/json
http://ipof.in/xml
http://ipof.in/txt
If you want HTTPS you can use the same URLs with https prefix. The advantage being that even if you are on a Wifi you will get the public address.
 */
NSError *error; 
NSURL *ipURL = [NSURL URLWithString:@"http://ipof.in/txt"];
NSString *ip = [NSString stringWithContentsOfURL:ipURL encoding:NSUTF8StringEncoding error:&error];

2017年08月04日
增加部分公開API
1冗酿、淘寶API

1. 請求接口（GET）：
http://ip.taobao.com/service/getIpInfo.php?ip=ip地址
2. 響應信息：
（json格式的）國家 、氏盥辍（自治區(qū)或直轄市）弱判、市（縣）昌腰、運營商
3. 返回數(shù)據(jù)格式：
{
    "code": 0,
    "data": {
        "country": "中國",
        "country_id": "CN",
        "area": "華南",
        "area_id": "800000",
        "region": "廣東省",
        "region_id": "440000",
        "city": "深圳市",
        "city_id": "440300",
        "county": "",
        "county_id": "-1",
        "isp": "電信",
        "isp_id": "100017",
        "ip": "121.35.211.41"
    }
}
其中code的值的含義為，0：成功固灵，1：失敗劫流。
4. 訪問限制：為了保障服務正常運行丛忆，每個用戶的訪問頻率需小于10qps。

2菠秒、站長工具API

http://ip.chinaz.com/getip.aspx
返回數(shù)據(jù)格式：
{ip:'121.35.211.41',address:'廣東省深圳市 電信'}

再一次感謝您花費時間閱讀這篇文章！

作者：SuperDanny鏈接：http://www.reibang.com/p/a74f64f9b72f