如何接收连接已更改类型的通知（3G，Edge，Wifi，GPRS）

有没有办法发现当前连接是3G，Edge还是WiFi，并收到通知？ 或者只是一种方法来发现连接是否是WiFi？

Answer 1

您应该使用Apple的Reachability类

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

在实现之后，您可以在委托中使用它：

- (void) configureTextField: (Reachability*) curReach { NetworkStatus netStatus = [curReach currentReachabilityStatus]; BOOL connectionRequired= [curReach connectionRequired]; NSString* statusString= @"non"; switch (netStatus) { case NotReachable: { statusString = @"Access Not Available"; //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"; UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Cellular Data Detected" message:@"You are using Cellular data such as 3G or Edge. Downloading large amount of data may effect your cellular internet package costs. To avoid such extra cost kindly use Wifi." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; [alert release]; break; } case ReachableViaWiFi: { statusString= @"Reachable WiFi"; break; } } if(connectionRequired) { statusString= [NSString stringWithFormat: @"%@, Connection Required", statusString]; } NSLog(@"Network= %@",statusString); if ([statusString isEqualToString:@"Access Not Available"]){ UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"No Internet Connection" message:@"It seems you are not connected to the internet, the app will try to load from the last cached data - assuming this data exist." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; [alert release]; } //textField.text= statusString; } - (void) updateInterfaceWithReachability: (Reachability*) curReach { if(curReach == hostReach) { //[self configureTextField: remoteHostStatusField imageView: remoteHostIcon reachability: curReach]; // NetworkStatus netStatus = [curReach currentReachabilityStatus]; // BOOL connectionRequired= [curReach connectionRequired]; [self configureTextField:curReach]; } } 

Answer 2

是的，Apple有一个示例项目可以certificate这一点。 可达性

而这里的一个例子。