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
"); 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"; }} |