iphone判断当前网络连接类型

eachability只能区分出无网络、wifi和wwan(2G&2.5G&3G)类型的网络连接类型，只需重构networkStatusForFlags方法，即可详细区分出2G与3G网络 

 

 [代码] 

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//Reachability.m 中 networkStatusForFlags 方法重构 - (NetworkStatus) networkStatusForFlags: (SCNetworkReachabilityFlags) flags {     if ((flags & kSCNetworkReachabilityFlagsReachable) == 0)     {         return NotReachable;     }           BOOL retVal = NotReachable;           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         retVal = ReachableViaWiFi;     }                 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             retVal = ReachableViaWiFi;         }     }           if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN)     {         if((flags & kSCNetworkReachabilityFlagsReachable) == kSCNetworkReachabilityFlagsReachable) {             if ((flags & kSCNetworkReachabilityFlagsTransientConnection) == kSCNetworkReachabilityFlagsTransientConnection) {                 retVal = ReachableVia3G;                 if((flags & kSCNetworkReachabilityFlagsConnectionRequired) == kSCNetworkReachabilityFlagsConnectionRequired) {                     retVal = ReachableVia2G;                 }             }         }     }     return retVal; }   //检查当前网络连接是否正常 -(BOOL)connectedToNetWork {     struct sockaddr_in zeroAddress;     bzero(&zeroAddress, sizeof(zeroAddress));     zeroAddress.sin_len = sizeof(zeroAddress);     zeroAddress.sin_family = AF_INET;           SCNetworkReachabilityRef defaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);     SCNetworkReachabilityFlags flags;           BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);     CFRelease(defaultRouteReachability);           if (!didRetrieveFlags) {         printf("Error. Count not recover network reachability flags\n");         return NO;     }           BOOL isReachable = flags & kSCNetworkFlagsReachable;     BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;     return (isReachable && !needsConnection) ? YES : NO; }   //检查网络连接类型 -(void)checkNetworktype:(id)sender{     NSString *connectionKind;     if ([self connectedToNetWork]) {         hostReach = [Reachability reachabilityWithHostName:@"www.google.com"];         switch ([hostReach currentReachabilityStatus]) {             case NotReachable:                 connectionKind = @"没有网络链接";                 break;             case ReachableViaWiFi:                 connectionKind = @"当前使用的网络类型是WIFI";                 break;             case ReachableVia3G:                 connectionKind = @"当前使用的网络链接类型是WWAN（3G）";                 break;             case ReachableVia2G:                 connectionKind = @"当前使用的网络链接类型是WWAN（2G）";                 break;                default:                 break;         }     }else {         connectionKind = @"没有网络链接";     } }