iOS获取设备IP地址(ipv4/ipv6有效性判断)

先说明一下，获取IP地址方法网上很多，大多不是很全面，获取的IP地址应该同时包含ipv4和ipv6的，同时由于iOS系统问题，即时连接的是4G没有连接WiFi，获取的WiFi地址也有值不为空，因此需要判断处理一下。例如下面这个：

取有效ip地址

有的小伙伴把fe80开头的ipv6地址过滤掉，来获取当前连接的ipv6地址，这种方式也是可以的。

1 引入头文件和宏定义

#import 
#import 
#import 
#import 
#import 
#import 
#import 
#import 
#import 

#define IOS_CELLULAR    @"pdp_ip0"
#define IOS_WIFI        @"en0"
//#define IOS_VPN         @"utun0" 不需要获取vpn的ip地址
#define IP_ADDR_IPv4    @"ipv4"
#define IP_ADDR_IPv6    @"ipv6"

2 获取IP地址

/*
 * 获取设备当前网络IP地址
 */
+(NSString *)getIPAddress:(BOOL)preferIPv4
{
    NSArray *searchArray = @[];
    NetworkStatus status = [Reachability currentReachabilityStatus];
    if (status == NetStatus_ReachableViaWiFi){
        if (preferIPv4) {
            searchArray = @[IOS_WIFI @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR_IPv6 ];
        }else{
            searchArray = @[IOS_WIFI @"/" IP_ADDR_IPv6, IOS_WIFI @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4 ];
        }
    }else{
        //非WiFi都默认是蜂窝移动
        if (preferIPv4) {
            searchArray = @[IOS_CELLULAR @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR_IPv6, IOS_WIFI @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6 ];
        }else{
            searchArray = @[IOS_CELLULAR @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6, IOS_WIFI @"/" IP_ADDR_IPv4 ];
        }
    }
    
    NSDictionary *addresses = [self getIPAddr];
    
    __block NSString *address;
    [searchArray enumerateObjectsUsingBlock:^(NSString *key, NSUInteger idx, BOOL * _Nonnull stop) {
        address = addresses[key];
        //筛选出IP地址格式
       if([self checkIPAddreddIsValid:address]) *stop = YES;
    }];
    return address ? address : @"0.0.0.0";
}

+(NSDictionary *)getIPAddr
{
    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;
}

3判断IP地址有效性

/**
 判断ip地址是否有效
 @param ipAddress ip地址
 */
+(BOOL)checkIPAddreddIsValid:(NSString*)ipAddress
{
    if (ipAddress.length == 0) {
        return NO;
    }
    BOOL bResult = NO;
    
    //判断是否是ipv4
    NSString* strReguEx = @"^(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])(\\.(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])){3}$";
    {
        NSError *error;
        NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:strReguEx options:0 error:&error];
        if (regex != nil) {
            NSTextCheckingResult *firstMatch=[regex firstMatchInString:ipAddress options:0 range:NSMakeRange(0, [ipAddress length])];
            bResult = firstMatch;
        }
    }
    //判断是否是ipv6
    if (!bResult) {
        strReguEx = @"^((([0-9A-Fa-f]{1,4}:){7}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){1,7}:)|(([0-9A-Fa-f]{1,4}:){6}:[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){5}(:[0-9A-Fa-f]{1,4}){1,2})|(([0-9A-Fa-f]{1,4}:){4}(:[0-9A-Fa-f]{1,4}){1,3})|(([0-9A-Fa-f]{1,4}:){3}(:[0-9A-Fa-f]{1,4}){1,4})|(([0-9A-Fa-f]{1,4}:){2}(:[0-9A-Fa-f]{1,4}){1,5})|([0-9A-Fa-f]{1,4}:(:[0-9A-Fa-f]{1,4}){1,6})|(:(:[0-9A-Fa-f]{1,4}){1,7})|(([0-9A-Fa-f]{1,4}:){6}(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])(\\.(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])){3})|(([0-9A-Fa-f]{1,4}:){5}:(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])(\\.(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])){3})|(([0-9A-Fa-f]{1,4}:){4}(:[0-9A-Fa-f]{1,4}){0,1}:(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])(\\.(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])){3})|(([0-9A-Fa-f]{1,4}:){3}(:[0-9A-Fa-f]{1,4}){0,2}:(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])(\\.(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])){3})|(([0-9A-Fa-f]{1,4}:){2}(:[0-9A-Fa-f]{1,4}){0,3}:(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])(\\.(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])){3})|([0-9A-Fa-f]{1,4}:(:[0-9A-Fa-f]{1,4}){0,4}:(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])(\\.(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])){3})|(:(:[0-9A-Fa-f]{1,4}){0,5}:(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])(\\.(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])){3}))$";
        
        NSError *error;
        NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:strReguEx options:0 error:&error];
        if (regex != nil) {
            NSTextCheckingResult *firstMatch=[regex firstMatchInString:ipAddress options:0 range:NSMakeRange(0, [ipAddress length])];
            bResult = firstMatch;
        }
        
    }
    
    return bResult;
}

如果需要获取 USB有线连接、VPN等其他连接方式的IP地址，请参考
Stack Overflow这个文章