一.导入头文件

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

#define IOS_CELLULAR @”pdp_ip0″
//有些分配的地址为en0 有些分配的en1
#define IOS_WIFI2 @”en2″
#define IOS_WIFI1 @”en1″
#define IOS_WIFI @”en0″
//#define IOS_* @”utun0″ *很少用到可以注释
#define IP_ADDR_IPv4 @”ipv4″
#define IP_ADDR_IPv6 @”ipv6″
二.方法实现

//获取设备当前网络IP地址（是获取IPv4 还是 IPv6）
– (NSString *)getIPAddress:(BOOL)preferIPv4
{
//从字典中按顺序查询 查询到不为空即停止（顺序为4G(3G)、Wi-Fi、局域网）
NSArray *searchArray = preferIPv4 ?
@[ /*IOS_* @”/” IP_ADDR_IPv4, IOS_* @”/” IP_ADDR_IPv6,*/ IOS_CELLULAR @”/” IP_ADDR_IPv4, IOS_WIFI2 @”/” IP_ADDR_IPv4, IOS_WIFI1 @”/” IP_ADDR_IPv4, IOS_WIFI @”/” IP_ADDR_IPv4] :
@[ /*IOS_* @”/” IP_ADDR_IPv6, IOS_* @”/” IP_ADDR_IPv4,*/ IOS_CELLULAR @”/” IP_ADDR_IPv6, IOS_WIFI2 @”/” IP_ADDR_IPv6, IOS_WIFI1 @”/” IP_ADDR_IPv6, IOS_WIFI @”/” IP_ADDR_IPv6] ;

NSDictionary *addresses = [self getIPAddresses];
NSLog(@”addresses: %@”, addresses);

__block NSString *address;
[searchArray enumerateObjectsUsingBlock:^(NSString *key, NSUInteger idx, BOOL *stop)
{
address = addresses[key];
if(address) *stop = YES;
} ];
return address ? address : @”0.0.0.0″;
}

//获取所有相关IP信息
– (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;
}
//lo0         本地ip, 127.0.0.1

//en0        局域网ip, 192.168.1.23

//pdp_ip0    WWAN地址，即3G ip,

//bridge0    桥接、热点ip，172.20.10.1