问题描述
项目需要采集设备信息，从 stackOverFlow 上找到的方法是
+ (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 interfacesstruct 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 memoryfreeifaddrs(interfaces); } return [addresses count] ? addresses : nil;}
获得到的ip地址是192.168.1.100,但是手机直接在百度上得到的IP地址是218.65.52.142（这个是对的），前面是local address?
stackOverFlow地址：链接描述
wifi 和4g的情况是一样的，有能获取后面地址的方法吗？
问题解答
回答1：如果只是收集IP信息的话，直接在服务端提供一个接口，客户端请求时，服务端记录客户端的真实IP即可
回答2：引用ALNetwork然后 NSString *IPAddress = [ALNetwork externalIPAddress];就可以获取到了。这个类用的方法其实是通过请求别人的服务器获取IP的。(http://www.dyndns.org/cgi-bin...
// Credits to Shmoopi LLC, SystemServiceDemo// Get the External IP Address+ (NSString *)externalIPAddress { // Check if we have an internet connection then try to get the External IP Address if (![self connectedViaWiFi] && ![self connectedVia3G]) {// Not connected to anything, return nilreturn nil; }// Get the external IP Address based on dynsns.org NSError *error = nil; NSString *theIpHtml = [NSString stringWithContentsOfURL:[NSURL URLWithString:@'http://www.dyndns.org/cgi-bin/check_ip.cgi'] encoding:NSUTF8StringEncoding error:&error]; if (!error) {NSUInteger an_Integer;NSArray *ipItemsArray;NSString *externalIP;NSScanner *theScanner;NSString *text = nil;theScanner = [NSScanner scannerWithString:theIpHtml];while ([theScanner isAtEnd] == NO) {// find start of tag [theScanner scanUpToString:@'<' intoString:NULL] ;// find end of tag [theScanner scanUpToString:@'>' intoString:&text] ;// replace the found tag with a space //(you can filter multi-spaces out later if you wish) theIpHtml = [theIpHtml stringByReplacingOccurrencesOfString: [ NSString stringWithFormat:@'%@>', text] withString:@' '] ; ipItemsArray = [theIpHtml componentsSeparatedByString:@' ']; an_Integer = [ipItemsArray indexOfObject:@'Address:']; externalIP =[ipItemsArray objectAtIndex:++an_Integer];}// Check that you get something backif (externalIP == nil || externalIP.length <= 0) { // Error, no address found return nil;}// Return External IPreturn externalIP; } else {// Error, no address foundreturn nil; }}
我根据 Stack Overflow 的这个回答建了一个测试工程 Objective C - How to get the public IP address of the deviceGithub: Github iOS-GetIP你可以下载下来试一下。那个ALNetwork引用了一个检查网络连接状态的类，我将它注释掉了，你如果需要可以加进去。
