直接贴代码吧，ios7之后是获取的较为准确，7以下我拿iphone5测试的是无法区分3g/2g。连iphone4都能升到7.1.4，而且目前主流的设备7以下的系统已经很少了，这个方案尽管不太完美，但影响不会太大

 

#import 
     
         string GetNetWorkType() {
       string strNetworkType = "";         //创建零地址，0.0.0.0的地址表示查询本机的网络连接状态     struct sockaddr_storage zeroAddress;         bzero(&zeroAddress, sizeof(zeroAddress));     zeroAddress.ss_len = sizeof(zeroAddress);     zeroAddress.ss_family = AF_INET;         // Recover reachability flags     SCNetworkReachabilityRef defaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);     SCNetworkReachabilityFlags flags;         //获得连接的标志     BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);     CFRelease(defaultRouteReachability);         //如果不能获取连接标志，则不能连接网络，直接返回     if (!didRetrieveFlags)     {
           return strNetworkType;     }             if ((flags & kSCNetworkReachabilityFlagsConnectionRequired) == 0)     {
           // if target host is reachable and no connection is required         // then we'll assume (for now) that your on Wi-Fi         strNetworkType = "WIFI";     }         if (         ((flags & kSCNetworkReachabilityFlagsConnectionOnDemand ) != 0) ||         (flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) != 0         )     {
           // ... and the connection is on-demand (or on-traffic) if the         // calling application is using the CFSocketStream or higher APIs         if ((flags & kSCNetworkReachabilityFlagsInterventionRequired) == 0)         {
               // ... and no [user] intervention is needed             strNetworkType = "WIFI";         }     }         if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN)     {
           if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)         {
               CTTelephonyNetworkInfo * info = [[CTTelephonyNetworkInfo alloc] init];             NSString *currentRadioAccessTechnology = info.currentRadioAccessTechnology;                         if (currentRadioAccessTechnology)             {
                   if ([currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyLTE])                 {
                       strNetworkType =  "4G";                 }                 else if ([currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyEdge] || [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyGPRS])                 {
                       strNetworkType =  "2G";                 }                 else                 {
                       strNetworkType =  "3G";                 }             }         }         else         {
               if((flags & kSCNetworkReachabilityFlagsReachable) == kSCNetworkReachabilityFlagsReachable)             {
                   if ((flags & kSCNetworkReachabilityFlagsTransientConnection) == kSCNetworkReachabilityFlagsTransientConnection)                 {
                       if((flags & kSCNetworkReachabilityFlagsConnectionRequired) == kSCNetworkReachabilityFlagsConnectionRequired)                     {
                           strNetworkType = "2G";                     }                     else                     {
                           strNetworkType = "3G";                     }                 }             }         }     }             if (strNetworkType == "") {
           strNetworkType = "WWAN";     }         NSLog( @"GetNetWorkType() strNetworkType :  %s", strNetworkType.c_str());         return strNetworkType; }
     

 

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