OC-18. Monitor the network status of your iphone

Use a system approach to monitor network status

• The method of system is to realize the monitoring of network state through notification mechanism.

• Steps to implement network status monitoring

  • Define a member variable of type reachability to save the state of the network

    @property (nonatomic, strong) Reachability *reachability;

  • Observers registered as notification hubs

     //registering observers in notification hubs [nsnotificationcenter Defaultcenter] addobserver:self Selector: @selector (getnetworkstatus) Name:kreachabilitychangednotification object: nil]; /*** Getnetworkstatus: The callback method that the Supervisor hears notification * Kreachabilitychangednotification: The type of notification, that is, when the network state changes, Trigger Notification * Object: parameter passed to Getnetworkstatus callback method *///Get and Save network status self< Span class= "hljs-variable" >.reachability = [reachability reachabilityforinternetconnection]; //start listening [self.reachability Startnotifier];              

  • To determine the status of the network in the triggering method of the alert notification

     -(void) Getnetworkstatus{if ([reachability Reachabilityforlocalwifi] .currentreachabilitystatus! = notreachable) {nslog (@ "is WiFi");} else if ([reachability reachabilityforinternetconnection]< Span class= "hljs-variable" >.currentreachabilitystatus! = notreachable) {NSLog (@ "is the mobile phone comes with the network");} else{nslog (@ "network Problematic");}}   

  • Remove the observer from the Notification Center, stop listening, and empty the network listener

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

Using Afnetworking to monitor network status

• Monitoring network status via AFN is relatively simple

• To implement network status monitoring

  • Get an instance of Afnetworkreachabilitymanager

    AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager];

  • Set the block that the manager callback when the network changes

    [manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {    NSLog(@"----当前网络状态---%zd", status);}];/*** status：表示当前网络的状态，是个枚举类型变量，具有以下取值*AFNetworkReachabilityStatusUnknown = -1*AFNetworkReachabilityStatusNotReachable = 0*AFNetworkReachabilityStatusReachableViaWWAN = 1*AFNetworkReachabilityStatusReachableViaWiFi = 2*/

  • Start listening.

    [manager startMonitoring];

OC-18. Monitor your iphone's network status