关于获取当前网络是属于2G还是3G(极其简单)

中国的iphone网络是区分2G和3G，要想获取当前的网络状态一直没有一个好的方法，网上给的例子也不尽让人满意最近闲来无事，仔细的研究Apple提供的例子：Reachability

通过如下的代码：

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Reachability *reach = [Reachability reachabilityWithHostName:@"www.apple.com"];

NSLog(@"%d", [reach currentReachabilityStatus]);

return;

在currentReachabilityStatus函数中，我们注意到这样的输出：

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static void PrintReachabilityFlags(SCNetworkReachabilityFlags flags, c*****t char* comment)

{

#if kShouldPrintReachabilityFlags

NSLog(@"Reachability Flag Status: %c%c %c%c%c%c%c%c%c %s\n",

(flags & kSCNetworkReachabilityFlagsIsWWAN) ? 'W' : '-',

(flags & kSCNetworkReachabilityFlagsReachable) ? 'R' : '-',

(flags & kSCNetworkReachabilityFlagsTransientConnection) ? 't' : '-',

(flags & kSCNetworkReachabilityFlagsConnectionRequired) ? 'c' : '-',

(flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) ? 'C' : '-',

(flags & kSCNetworkReachabilityFlagsInterventionRequired) ? 'i' : '-',

(flags & kSCNetworkReachabilityFlagsConnectionOnDemand) ? 'D' : '-',

(flags & kSCNetworkReachabilityFlagsIsLocalAddress) ? 'l' : '-',

(flags & kSCNetworkReachabilityFlagsIsDirect) ? 'd' : '-',

comment

);

#endif

}

当是wifi的时候输出R

当是3G的时候输出Rt

当是联通2G或者是移动的时候输出Rtc

在头文件定义如下：

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typedef enum

{

NotReachable = 0,

ReachableViaWiFi,

ReachableVia3G,

ReachableVia2G,//当前无法区分是联通的2G还是移动的2G

} NetworkStatus;

因此我就是以这个为判断条件的，重写Reachability的函数：

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- (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)

{

retVal = ReachableVia3G;

if((flags & kSCNetworkReachabilityFlagsReachable) == kSCNetworkReachabilityFlagsReachable)

{

if ((flags & kSCNetworkReachabilityFlagsTransientConnection) == kSCNetworkReachabilityFlagsTransientConnection)

{

retVal = ReachableVia3G;

if((flags & kSCNetworkReachabilityFlagsConnectionRequired) == kSCNetworkReachabilityFlagsConnectionRequired)

{

retVal = ReachableVia2G;

}

}

}

}

return retVal;

}

这样就可以正确的区分是2G，3G，wifi网络，这只支持中国地区，其他地区未考虑。
作者：Rush.D.Xzj

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