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 <SystemConfiguration/CaptiveNetwork.h>
#import <ifaddrs.h>
#import <resolv.h>
#import <arpa/inet.h>
#import <net/if.h>
#import <netdb.h>
#import <netinet/ip.h>
#import <net/ethernet.h>
#import <net/if_dl.h>
#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
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