iphone判断当前网络连接类型WIF、WWAN、2G和3G

- (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-FiretVal = 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 APIsif ((flags & kSCNetworkReachabilityFlagsInterventionRequired) == 0){// ... and no [user] intervention is neededretVal = ReachableViaWiFi;}}if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN){if((flags & kSCNetworkReachabilityFlagsReachable) == kSCNetworkReachabilityFlagsReachable) {if ((flags & kSCNetworkReachabilityFlagsTransientConnection) == kSCNetworkReachabilityFlagsTransientConnection) {retVal = ReachableVia3G;if((flags & kSCNetworkReachabilityFlagsConnectionRequired) == kSCNetworkReachabilityFlagsConnectionRequired) {retVal = ReachableVia2G;}}}}return retVal;}

Reachability.h中添加

typedef enum {NotReachable = 0,ReachableViaWiFi,ReachableViaWWAN, ReachableVia2G,ReachableVia3G
} NetworkStatus;

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;
}

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";}}