Reachability.m 中 networkStatusForFlags 方法重构

//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" ;
    }
}