OC, oc Language

OC, oc Language
Use the system method to monitor the network status

• The system monitors the network status through the notification mechanism.

• Steps for network status monitoring

  • Define Reachability member variables to save the network status

    @property (nonatomic, strong) Reachability *reachability;

  • Observer registered as the notification center

    // Register the observer [[NSNotificationCenter defacenter center] addObserver: self selector: @ selector (getNetworkStatus) name: kReachabilityChangedNotification object: nil] in the notification center;/*** getNetworkStatus: callback Method * kReachabilityChangedNotification: Notification type, that is, when the network status changes, the notification is triggered * object: the parameter passed to the getNetworkStatus callback Method * // gets and saves the network status self. reachability = [Reachability reachabilityForInternetConnection]; // start listening to [self. reachability startNotifier];

  • Determine the network status in the trigger Method for listening to notifications

    -(Void) getNetworkStatus {if ([Reachability reachabilityForLocalWiFi]. currentReachabilityStatus! = NotReachable) {NSLog (@ "WIFI");} else if ([Reachability reachabilityForInternetConnection]. currentReachabilityStatus! = NotReachable) {NSLog (@ "bring your phone network");} else {NSLog (@ "network problems ");}}

  • Remove the observer from the notification center, stop the listener, and clear the network listener object.

    - (void)dealloc{[[NSNotificationCenter defaultCenter] removeObserver:self];[self.reachability stopNotifier];self.reachability = nil;}

Use AFNetworking to monitor network status

• It is relatively simple to monitor the network status through AFN

• Network Status Monitoring

  • Obtain the AFNetworkReachabilityManager instance

    AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager];

  • Sets the callback Block for the manager when the network changes.

    [Manager setReachabilityStatusChangeBlock: ^ (AFNetworkReachabilityStatus status) {NSLog (@ "---- current network status --- % zd", status) ;}];/*** status: indicates the status of the current network. It is an enumeration type variable and has the following values: * AFNetworkReachabilityStatusUnknown =-1 * AFNetworkReachabilityStatusNotReachable = 0 * Running = 1 * Running = 2 */

  • Start listening

    [manager startMonitoring];