iOS获取设备IP地址

项目用到要获取iOS设备的IP地址，有2种方法：

1）第一种比较简单，但是只有当你的设备连接到WIFI时才能获取到IP地址，倘若你的设备用的是流量，那就不行。代码如下：

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

 // Get IP Address
 - (NSString *)getIPAddress {
     NSString *address = @"error";
     struct ifaddrs *interfaces = NULL;
     struct ifaddrs *temp_addr = NULL;
     int success = ;
     // retrieve the current interfaces - returns 0 on success
     success = getifaddrs(&interfaces);
     if (success == ) {
         // 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;  

 }   

2）第二种方法比较通用，无论是WIFI还是流量都能获取到IP地址，代码如下：

 #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 - 获取设备当前网络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, BOOLBOOL *stop)
      {
          address = addresses[key];
          //筛选出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 == ) {
         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: error:&error];  

     if (regex != nil) {
         NSTextCheckingResult *firstMatch=[regex firstMatchInString:ipAddress options: range:NSMakeRange(, [ipAddress length])];  

         if (firstMatch) {
             NSRange resultRange = [firstMatch rangeAtIndex:];
             NSString *result=[ipAddress substringWithRange:resultRange];
             //输出结果
             NSLog(@"%@",result);
             return YES;
         }
     }
     return NO;
 }  

 + (NSDictionary *)getIPAddresses
 {
     NSMutableDictionary *addresses = [NSMutableDictionary dictionaryWithCapacity:];  

     // 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;
 }  

Reference

[1] http://superdanny.link/2016/01/27/iOS-get-device-ip-address/index.html

[2] http://stackoverflow.com/questions/7072989/iphone-ipad-osx-how-to-get-my-ip-address-programmatically

原文地址：http://blog.csdn.net/luoshengkim/article/details/51135063