IOS开发之判断IPHONE连接的网络（WIFI,2G,3G,4G）是IPV4还是IPV6网络

可能问题太简单了，在网上没有找到答案，只好我自己写了。

由于苹果审核我们的应用在ipv6环境下，无法连接到服务器。所以把原来的用IP作为请求网址改成了域名来发请求。虽然审核过了，但是在国内还有域名解析的问题，使用域名有可能没有解析到ip地址，有可能解析的ip地址不正确（可能域名转发引起的，域名转发已经被国家禁止）。

所以我想如果手机当前连接的ipv4的网络，还用原来的ip请求。如果手机连接的是ipv6网络，则使用域名连接。

下面我对不同的设备分别使用ipv4(wifi,4G)和ipv6(wifi)网络进行测试：

 IPV4IPV6IPAD（WIFI）en0/ipv4 = 192.168.2.90,
lo0/ipv6 = fe80::1,
awdl0/ipv6 = fe80::5cbf:1aff:fe4e:ef38,
en0/ipv6 = fe80::ae:8811:f45b:198a,
lo0/ipv4 = 127.0.0.1en0/ipv4 = 169.254.229.160,
lo0/ipv6 = fe80::1,
awdl0/ipv6 = fe80::5cbf:1aff:fe4e:ef38,
en0/ipv6 = 2001:2::aab1:6005:dcd1:6ffd:63e4,
lo0/ipv4 = 127.0.0.1IPHONE6（WIFI）en0/ipv4 = 192.168.8.110,
lo0/ipv6 = fe80::1,
awdl0/ipv6 = fe80::b84d:41ff:fe6e:2925,
en0/ipv6 = fe80::435:13b1:816c:9db9,
lo0/ipv4 = 127.0.0.1en0/ipv4 = 169.254.87.24,
lo0/ipv6 = fe80::1,
awdl0/ipv6 = fe80::b84d:41ff:fe6e:2925,
en0/ipv6 = 2001:2::aab1:b19e:527a:45d3:9f,
lo0/ipv4 = 127.0.0.1IPHONE6S（WIFI）en0/ipv4 = 192.168.2.94,
lo0/ipv6 = fe80::1,
awdl0/ipv6 = fe80::a0ff:ddff:fec0:a676,
en0/ipv6 = fe80::444:d26c:1b78:8f89,
lo0/ipv4 = 127.0.0.1,
utun0/ipv6 = fe80::3213:2aa4:9fed:9339 IPHONE6PLUS
(4G)lo0/ipv6 = fe80::1,
pdp_ip0/ipv4 = 10.241.179.135,
lo0/ipv4 = 127.0.0.1,
utun0/ipv6 = fe80::e7dd:8eef:da5e:f8f7 IPHONE4（WIFI）lo0/ipv4 = 127.0.0.1,
en0/ipv4 = 192.168.2.138,
lo0/ipv6 = fe80::1,
en0/ipv6 = fe80::1420:27e5:d334:e8delo0/ipv4 = 127.0.0.1,
en0/ipv4 = 169.254.120.241,
lo0/ipv6 = fe80::1,
en0/ipv6 = 2001:2::aab1:509d:9f42:38e0:a945      

经过分析发现：

1.lo0/ipv6 = fe80::1,这个是固定的

2.lo0/ipv4 = 127.0.0.1 这个也是固定的

3.ipv6下 en0/ipv4 = 169.254.120.241,是固定的

4.ipv4下：awdl0/ipv6，en0/ipv6，utun0/ipv6对应的值都是fe80 开头

结论：在ipv6下，awdl0/ipv6，en0/ipv6，utun0/ipv6对应的值肯定有一个不是以fe80 开头

还有好多情况没有考虑eg:VPN

下面开始写代码来判断：

导入头文件和宏定义

#define IOS_CELLULAR    @"pdp_ip0"#define IOS_WIFI        @"en0"#define IOS_VPN         @"utun0"#define IP_ADDR_IPv4    @"ipv4"#define IP_ADDR_IPv6    @"ipv6"#import <ifaddrs.h>#import <arpa/inet.h>#import <net/if.h>

添加两个方法

+ (BOOL)isIpv6{    NSArray *searchArray =    @[ 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 BOOL isIpv6 = NO;    [searchArray enumerateObjectsUsingBlock:^(NSString *key, NSUInteger idx, BOOL *stop)     {                  NSLog(@"---%@---%@---",key, addresses[key] );                  if ([key rangeOfString:@"ipv6"].length > 0  && ![[NSString stringWithFormat:@"%@",addresses[key]] hasPrefix:@"(null)"] ) {                          if ( ![addresses[key] hasPrefix:@"fe80"]) {                 isIpv6 = YES;             }         }               } ];        return isIpv6;}+ (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;                                                NSLog(@"ipv4 %@",name);                    }                } 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;                        NSLog(@"ipv6 %@",name);                                            }                }                if(type) {                    NSString *key = [NSString stringWithFormat:@"%@/%@", name, type];                    addresses[key] = [NSString stringWithUTF8String:addrBuf];                }            }        }        // Free memory        freeifaddrs(interfaces);    }    return [addresses count] ? addresses : nil;}

调用

- (void)viewDidLoad {    [super viewDidLoad];    //1:是ipv6    //0:不是ipv6    NSLog(@"###-###%d",[ViewController isIpv6]);  ;        if ([ViewController isIpv6] == YES) {        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示" message:@"是ipv6" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];        [alertView show];        }else{        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示" message:@"不是ipv6" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];        [alertView show];    }    }

代码已上传

http://download.csdn.net/detail/qq_15509071/9743137