iphone判断当前网络连接类型WIF、WWAN、2G和3G

在 apple 管网sample code的Reachability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 。

首先 去 apple 管网下载demo ，

Reachability地址：http://developer.apple.com/library/ios/#samplecode/Reachability/Listings/Classes_Reachability_m.html

然后打开工程

修改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;

 }

注意首先要在

Reachability.h中添加

 typedef enum {
     NotReachable = 0,
     ReachableViaWiFi,
     ReachableViaWWAN,
        <span style="color:#ff0000;"> ReachableVia2G,
         ReachableVia3Gspan>
 } NetworkStatus;

然后在

ReachabilityAppDelegate.m的

 - (void) configureTextField: (UITextField*) textField imageView: (UIImageView*) imageView reachability: (Reachability*) curReach
 {
     NetworkStatus netStatus = [curReach currentReachabilityStatus];
     BOOL connectionRequired= [curReach connectionRequired];
     NSString* statusString= @"";
     switch (netStatus)
     {
         case NotReachable:
         {
             statusString = @"Access Not Available";
             imageView.image = [UIImage imageNamed: @"stop-32.png"] ;
             //Minor interface detail- connectionRequired may return yes, even when the host is unreachable.  We cover that up here...
             connectionRequired= NO;
             break;
         }

         case ReachableViaWWAN:
         {
             statusString = @"Reachable WWAN";
             imageView.image = [UIImage imageNamed: @"WWAN5.png"];
             break;
         }
         case ReachableViaWiFi:
         {
              statusString= @"Reachable WiFi";
             imageView.image = [UIImage imageNamed: @"Airport.png"];
             break;
       }
      <span style="color:#ff0000;">       case ReachableVia2G:
         {
             statusString= @"2G";
             imageView.image = [UIImage imageNamed: @"Airport.png"];
             break;
         }
         case ReachableVia3G:
         {
             statusString= @"3G";
             imageView.image = [UIImage imageNamed: @"Airport.png"];
             break;
         }span>
     }
     if(connectionRequired)
     {
         statusString= [NSString stringWithFormat: @"%@, Connection Required", statusString];
     }
     textField.text= statusString;
 }

然后就ok了。

WIFI如下：

 //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";
     }}