Answers:
以下代码在iOS或OSX设备上查找所有IPv4和IPv6地址。第getIPAddress一种方法或多或少地充当了该答案中的旧代码：您可以选择一个或另一个类型的地址，并且它总是偏爱WIFI而不是蜂窝电话（显然，您可以更改此地址）。
更有趣的是，它可以返回找到的所有地址的字典，跳过not up接口的地址或与关联的地址loopback。先前的代码以及有关此主题的其他解决方案将无法正确解码IPv6（inet_ntoa无法处理它们）。Jens Alfke在苹果论坛上向我指出了这一点-可以使用的正确功能是inet_ntop（请参见手册页，或参阅Jens也提供的有关inet_ntop的文章。
字典键的格式为“接口”，“ /”，“ ipv4或ipv6”。
#include <ifaddrs.h>
#include <arpa/inet.h>
#include <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"
- (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];
if(address) *stop = YES;
} ];
return address ? address : @"0.0.0.0";
}
- (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;
}EDIT1：代码已于2014年5月16日更新（Lhunath指出的错误，请参见注释）。现在返回了环回地址，但是您可以轻松取消测试注释，以自己排除它们。
EDIT2 ：（某不知名人士）：2015年3月13日进一步改进：如果用户使用VPN（无论通过WiFi或蜂窝网络），则先前的代码将失败。现在，它甚至适用于VPN连接。VPN连接的优先级高于WiFi和Cell，因为这是设备处理它的方式。这对于Mac也应该有效，因为Mac上的VPN连接也使用IF utun0，但未经测试。
EDIT3：（9/8/2016）鉴于@Qiulang（请参阅注释）与VPN代码（其他人添加）所遇到的问题，我已将其注释掉。如果有人明确知道如何指定用户VPN，请添加注释。
addr获取一次NULL？我的用户偶尔会得到NULL。你知道什么可能的原因吗？
AF_INET用来检查。可能是这个吗？
在您的实施文件.m中，
#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 = 0;
// retrieve the current interfaces - returns 0 on success
success = getifaddrs(&interfaces);
if (success == 0) {
// 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;
} 许多现有解决方案仅考虑无线接口，该接口不适用于通过以太网适配器进行的有线连接（即无Wifi或3G）；请参阅此最新解决方案，该解决方案也考虑通过有线接口获得的IP地址。
使用Swift 3获取IP地址：
func getIPAddress() -> String {
var address: String = "error"
var interfaces: ifaddrs? = nil
var temp_addr: ifaddrs? = nil
var success: Int = 0
// retrieve the current interfaces - returns 0 on success
success = getifaddrs(interfaces)
if success == 0 {
// Loop through linked list of interfaces
temp_addr = interfaces
while temp_addr != nil {
if temp_addr?.ifa_addr?.sa_family == AF_INET {
// Check if interface is en0 which is the wifi connection on the iPhone
if (String(utf8String: temp_addr?.ifa_name) == "en0") {
// Get NSString from C String
address = String(utf8String: inet_ntoa((temp_addr?.ifa_addr as? sockaddr_in)?.sin_addr))
}
}
temp_addr = temp_addr?.ifa_next
}
}
// Free memory
freeifaddrs(interfaces)
return address
}当前解决方案未在OS X上返回en0设备，以下代码使用系统配置框架获取接口，然后使用标准C函数获取IP地址。
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/ioctl.h>
#include <net/if.h>
#define IFT_ETHER 0x6
#include <SystemConfiguration/SCDynamicStore.h>
+(void)getInterfaces
{
SCDynamicStoreRef storeRef = SCDynamicStoreCreate(NULL, (CFStringRef)@"FindCurrentInterfaceIpMac", NULL, NULL);
CFPropertyListRef global = SCDynamicStoreCopyValue (storeRef,CFSTR("State:/Network/Interface"));
id primaryInterface = [(__bridge NSDictionary *)global valueForKey:@"Interfaces"];
for (NSString* item in primaryInterface)
{
if(get_iface_address([item UTF8String]))
{
NSString *ip = [NSString stringWithUTF8String:get_iface_address([item UTF8String])];
NSLog(@"interface: %@ - %@",item,ip);
} else
NSLog(@"interface: %@",item);
}
}
static char * get_iface_address (char *interface)
{
int sock;
uint32_t ip;
struct ifreq ifr;
char *val;
if (!interface)
return NULL;
/* determine UDN according to MAC address */
sock = socket (AF_INET, SOCK_STREAM, 0);
if (sock < 0)
{
perror ("socket");
return NULL;
}
strcpy (ifr.ifr_name, interface);
ifr.ifr_addr.sa_family = AF_INET;
if (ioctl (sock, SIOCGIFADDR, &ifr) < 0)
{
perror ("ioctl");
close (sock);
return NULL;
}
val = (char *) malloc (16 * sizeof (char));
ip = ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr;
ip = ntohl (ip);
sprintf (val, "%d.%d.%d.%d",
(ip >> 24) & 0xFF, (ip >> 16) & 0xFF, (ip >> 8) & 0xFF, ip & 0xFF);
close (sock);
return val;
}此答案的灵感来自@DavidH的答案。我修正了一些问题，代替inet_ntop用getnameinfo它允许一个更简洁的方法。请注意，这将产生一个字典，该字典将接口名称映射到IP地址数组（从技术上说，一个接口可以具有多个与之关联的IPv4和IPv6）。它不能区分IPv4和IPv6：
// Get all our interface addresses.
struct ifaddrs *ifAddresses;
if (getifaddrs( &ifAddresses ) != 0) {
NSLog( @"Couldn't get interface addresses: %d", errno );
return nil;
}
int error;
char host[MAX( INET_ADDRSTRLEN, INET6_ADDRSTRLEN )];
_ipAddressesByInterface = [NSMutableDictionary dictionaryWithCapacity:8];
for (struct ifaddrs *ifAddress = ifAddresses; ifAddress; ifAddress = ifAddress->ifa_next) {
if (!(ifAddress->ifa_flags & IFF_UP) || (ifAddress->ifa_flags & IFF_LOOPBACK))
// Ignore interfaces that aren't up and loopback interfaces.
continue;
if (ifAddress->ifa_addr->sa_family != AF_INET && ifAddress->ifa_addr->sa_family != AF_INET6)
// Ignore non-internet addresses.
continue;
if ((error = getnameinfo( ifAddress->ifa_addr, ifAddress->ifa_addr->sa_len, host, sizeof( host ), NULL, 0, NI_NUMERICHOST )) != noErr) {
// Couldn't to format host name for this address.
NSLog( @"Couldn't resolve host name for address: %s", gai_strerror( error ) );
continue;
}
NSString *ifName = [NSString stringWithCString:ifAddress->ifa_name encoding: NSUTF8StringEncoding];
NSMutableArray *ifIpAddresses = _ipAddressesByInterface[ifName];
if (!ifIpAddresses)
ifIpAddresses = _ipAddressesByInterface[ifName] = [NSMutableArray arrayWithCapacity:2];
[ifIpAddresses addObject:[NSString stringWithCString:host encoding: NSUTF8StringEncoding]];
}
freeifaddrs( ifAddresses );
return _ipAddressesByInterface;strf-您的代码中是否有一个辅助功能？
err和strf。您可以替换strf为-stringWithCString:encoding:。 err是一个NSLog输出文件和行的包装器。 github.com/Lyndir/Pearl/blob/master/Pearl/...
在我从某些4G蜂窝网络获得此结果之前，@ DavidH的答案很好用：
{
"lo0/ipv4" = "127.0.0.1";
"lo0/ipv6" = "fe80::1";
"pdp_ip0/ipv4" = "10.132.76.168";
"utun0/ipv6" = "fe80::72c3:e25e:da85:b730";
}我没有使用vpn，所以我不知道为什么会有utun0 / ipv6。
- - 更新 - -
我进一步调试了此问题，发现即使在其他4G网络中，我也可以获得伪造的vpn地址（这是iOS错误吗？），
{
""awdl0/ipv6"" = ""fe80::c018:9fff:feb2:988"";
""en0/ipv6"" = ""fe80::181a:2e43:f91b:db2b"";
""lo0/ipv4"" = ""127.0.0.1"";
""lo0/ipv6"" = ""fe80::1"";
""pdp_ip0/ipv4"" = ""10.48.10.210"";
""utun0/ipv4"" = ""192.168.99.2"";
}如果我确实使用过vpn，我将得到以下信息：
{
"lo0/ipv4" = "127.0.0.1";
"lo0/ipv6" = "fe80::1";
"pdp_ip0/ipv4" = "10.49.187.23";
"utun0/ipv6" = "fe80::5748:5b5d:2bf0:658d";
"utun1/ipv4" = "192.168.99.2"; //the real one
}所以它是utun1不是utun0
不知道为什么我只需要丢弃vpn check :(
----更新----
我向苹果提出了一个错误（28131847），并回答：“并非所有的utun接口都适用于VPN。还有其他使用utun接口的OS功能。”
但是，当我问到如何获取有效的vpn IP地址时，他们的回答非常令人失望：“您可以进入“设置”->“ VPN”，然后查看您的VPN配置以查看VPN是否处于活动状态。在某些情况下，您可以看到也在那里分配了IP地址。我们现在正在关闭此错误报告。” :(
----更新2016/11/04 ----
我再次遇到问题，我需要进一步修改@DavidH的答案以解决此问题：
我在4G网络中，并且得到了以下地址：
addresses: {
"awdl0/ipv6" = "fe80::98fd:e6ff:fea9:3afd";
"en0/ipv6" = "fe80::8dd:7d92:4159:170e";
"lo0/ipv4" = "127.0.0.1";
"lo0/ipv6" = "fe80::1";
"pdp_ip0/ipv4" = "10.37.212.102";
"utun0/ipv6" = "fe80::279c:ea56:a2ef:d128";
}用他的原始答案，我会得到wifi IP fe80 :: 8dd：7d92：4159：170e，它是伪造的，连接失败。
所以我将代码修改为喜欢
[searchArray enumerateObjectsUsingBlock:^(NSString *key, NSUInteger idx, BOOL *stop)
{
if ((internetReach.isReachableViaWiFi && [key hasPrefix:IOS_WIFI]) ||
(internetReach.isReachableViaWWAN && [key hasPrefix:IOS_CELLULAR])) {
address = addresses[key];
if(address) *stop = YES;
}
} ];为迅速解决大该文件供应的所有细节。
在我的一个应用程序中，我需要获取wifi IP地址。我在上面的答案中使用了迅捷3，如下所示：
let WIFI_IF = "en0"
let UNKNOWN_IP_ADDRESS = ""
var addresses: [AnyHashable: Any] = ["wireless": UNKNOWN_IP_ADDRESS, "wired": UNKNOWN_IP_ADDRESS, "cell": UNKNOWN_IP_ADDRESS]
var interfaces: UnsafeMutablePointer<ifaddrs>? = nil
var temp_addr: UnsafeMutablePointer<ifaddrs>? = nil
var success: Int = 0
success = Int(getifaddrs(&interfaces))
if success == 0 {
temp_addr = interfaces
while temp_addr != nil {
if temp_addr?.pointee.ifa_addr == nil {
continue
}
if temp_addr?.pointee.ifa_addr.pointee.sa_family == UInt8(AF_INET) {
if (String(utf8String: (temp_addr?.pointee.ifa_name)!) == WIFI_IF) {
addresses["wireless"] = String(utf8String: inet_ntoa(((temp_addr?.pointee.ifa_addr as? sockaddr_in)?.sin_addr)!))
}
}
temp_addr = temp_addr?.pointee.ifa_next
}
}在此代码中，它崩溃是因为我必须nil在与用作可选语句的每个语句中进行检查?。因此，对我来说，最好在课堂上使用给定的链接文件。现在，我可以像这样轻松地进行检查：
class func getWifiIPAddress() -> String {
var wifiIp = ""
let WIFI_IF = "en0"
let allInterface = Interface.allInterfaces()
for interf in allInterface {
if interf.name == WIFI_IF {
if let address = interf.address {
if address.contains(".") {
wifiIp = address
break
}
}
}
}
return wifiIp
}我已经解析了字符串，"."因为接口类在我的iPhone中返回了两个接口，en0例如“ fb00 ::”和“ 101.10.1.1”
我创建了一个简单的文件来获取IP地址。我将此解决方案基于@ lundhjem，@ DavidH和@Ihunath的答案。它考虑有线连接。我没有在此解决方案中包括VPN。
PCNetwork.h
#import <Foundation/Foundation.h>
NS_ASSUME_NONNULL_BEGIN
@interface PCNetwork : NSObject
+ (NSString *)getIPAddress; // Prefers IPv4
+ (NSString *)getIPAddress:(BOOL)preferIPv4;
+ (NSDictionary *)getIPAddresses;
@end
NS_ASSUME_NONNULL_ENDPCNetwork.m
#import "PCNetwork.h"
#include <ifaddrs.h>
#include <arpa/inet.h>
#include <net/if.h>
#define IP_UNKNOWN @"0.0.0.0"
#define IP_ADDR_IPv4 @"ipv4"
#define IP_ADDR_IPv6 @"ipv6"
@implementation PCNetwork
#pragma mark - IP
+ (NSString *)getIPAddress {
return [self getIPAddress:YES];
}
+ (NSString *)getIPAddress:(BOOL)preferIPv4 {
NSArray *searchArray = [self getAllIFSearchArray:preferIPv4];
NSDictionary *addresses = [self getIPAddresses];
DLog(@"addresses: %@", addresses);
__block NSString *address = nil;
[searchArray enumerateObjectsUsingBlock:^(NSString *key, NSUInteger idx, BOOL *stop) {
address = addresses[key];
if(address) *stop = YES;
}];
return address ?: IP_UNKNOWN;
}
+ (NSDictionary *)getIPAddresses {
NSMutableDictionary *addresses = [NSMutableDictionary dictionary];
struct ifaddrs *interfaces;
BOOL success = !getifaddrs(&interfaces); // Retrieve the current interfaces : returns 0 on success
if (success) {
struct ifaddrs *temp_interface;
for (temp_interface = interfaces; temp_interface; temp_interface = temp_interface->ifa_next) { // Loop through linked list of interfaces
if (!(temp_interface->ifa_flags & IFF_UP) || (temp_interface->ifa_flags & IFF_LOOPBACK)) { // Ignore interfaces that aren't up and loopback interfaces.
continue;
}
if (!temp_interface->ifa_addr) {
continue;
}
const struct sockaddr_in *temp_addr = (const struct sockaddr_in*)temp_interface->ifa_addr;
if (temp_addr->sin_family == AF_INET || temp_addr->sin_family == AF_INET6) {
char addrBuf[MAX(INET_ADDRSTRLEN, INET6_ADDRSTRLEN)];
NSString *name = [NSString stringWithUTF8String:temp_interface->ifa_name];
NSString *type = nil;
if (temp_addr->sin_family == AF_INET) {
if (inet_ntop(AF_INET, &temp_addr->sin_addr, addrBuf, INET_ADDRSTRLEN)) {
type = IP_ADDR_IPv4;
}
} else {
const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6*)temp_interface->ifa_addr; // AF_INET6
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];
}
}
}
freeifaddrs(interfaces); // Free memory
}
return addresses.count ? addresses.copy : nil;
}
#pragma mark - Inter Frame Spacing
+ (NSArray *)getAllIFSearchArray:(BOOL)preferIPv4 {
NSArray *KNOWN_WIFI_IFS = @[@"en0"];
NSArray *KNOWN_WIRED_IFS = @[@"en1",@"en2",@"en3",@"en4"];
NSArray *KNOWN_CELL_IFS = @[@"pdp_ip0",@"pdp_ip1",@"pdp_ip2",@"pdp_ip3"];
NSMutableArray *searchArray = [NSMutableArray array];
// Add wifi
[searchArray addObjectsFromArray:[self getIFSearchArrayWith:KNOWN_WIFI_IFS preferIPv4:preferIPv4]];
// Add cell
[searchArray addObjectsFromArray:[self getIFSearchArrayWith:KNOWN_CELL_IFS preferIPv4:preferIPv4]];
// Add wired
[searchArray addObjectsFromArray:[self getIFSearchArrayWith:KNOWN_WIRED_IFS preferIPv4:preferIPv4]];
return searchArray.copy;
}
+ (NSArray *)getIFSearchArrayWith:(NSArray *)iFList preferIPv4:(BOOL)preferIPv4 {
NSMutableArray *searchArray = [NSMutableArray array];
for (NSString *iFType in iFList) {
if (preferIPv4) {
[searchArray addObject:[NSString stringWithFormat:@"%@/%@", iFType, IP_ADDR_IPv4]];
[searchArray addObject:[NSString stringWithFormat:@"%@/%@", iFType, IP_ADDR_IPv6]];
} else {
[searchArray addObject:[NSString stringWithFormat:@"%@/%@", iFType, IP_ADDR_IPv6]];
[searchArray addObject:[NSString stringWithFormat:@"%@/%@", iFType, IP_ADDR_IPv4]];
}
}
return searchArray.copy;
}
@end在iOS 13.4.1中对我不起作用。我用这个修复它。
+ (NSString *)getIPAddress{
NSArray *searchArray =
@[ IOS_VPN @"/" IP_ADDR_IPv4, IOS_VPN @"/" IP_ADDR_IPv6, IOS_WIFI @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6, IOS_4_3G @"/" IP_ADDR_IPv4, IOS_4_3G @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR_IPv6];
__block NSDictionary *addresses = [self getIPAddressArray];
__block NSString *address;
[searchArray enumerateObjectsUsingBlock:^(NSString *key, NSUInteger idx, BOOL *stop)
{
address = addresses[key];
if ([key rangeOfString:@"ipv6"].length > 0 && ![[NSString stringWithFormat:@"%@",addresses[key]] hasPrefix:@"(null)"] ) {
if ( ![addresses[key] hasPrefix:@"fe80"]) {
// isIpv6 = YES;
*stop = YES;
}
}else{
if([self isValidatIP:address]) {
*stop = YES;
}
}
} ];
return address ? address : @"error";
}
+ (NSString *)getIPType{
NSString *ipAddress = [self getIPAddress];
if ([self isValidatIP:ipAddress]) {
return @"04";//ipv4
}else{
return @"06";//ipv6
}
}
+ (NSDictionary *)getIPAddressArray{
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;
}
+ (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];
//输出结果
NSLog(@"%@",result);
return YES;
}
}
return NO;
}