2. Check the network status

 

　　

　　　　

　　

                   - (         - (IBAction)testNetStatus:(     NSString *site =     Reachability *reach =                           [self showAlert:[NSString stringWithFormat:                                            [self showAlert:[NSString stringWithFormat:                                                [self showAlert:[NSString stringWithFormat:                       - (IBAction)testWifi:(      ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] !=         [self showAlert:     }         [self showAlert:     - (IBAction)testInternet:(      ([[Reachability reachabilityForInternetConnection] currentReachabilityStatus] !=         [self showAlert:     }         [self showAlert:    -() showAlert:(NSString*      UIAlertView *alert = [[UIAlertView alloc] initWithTitle: message:msg :nil cancelButtonTitle:         - (          

　　

typedef = ,         ReachableViaWiFi,         ReachableViaWWAN      }NetworkStatus;

　　

Method to obtain the network connection status. If the network connection status returns NotReachable, it indicates that this type of network is not connected.

 

        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification     Reachability *reach = [Reachability reachabilityWithHostName:    [reach startNotifier];

This means that when the connection status of the Reachability changes, the default notification center will receive the notification, which triggers the reachabilityChanged: Method of the application delegate class, you also need to define the following methods in the application delegate class:

- () reachabilityChanged:(NSNotification*    Reachability *curReach = [note     NetworkStatus status = (status ==*alert = [[UIAlertView alloc] initWithTitle: message: :nil cancelButtonTitle: