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,
ReachableVia2G,
ReachableVia3G
} 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;
}
case ReachableVia2G:
{
statusString= @"2G";
imageView.image = [UIImage imageNamed: @"Airport.png"];
break;
}
case ReachableVia3G:
{
statusString= @"3G";
imageView.image = [UIImage imageNamed: @"Airport.png"];
break;
}
}
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";
}}