NXNetworkDelegate
@protocol NXNetworkDelegate <NSObject>The methods of NXNetworkNavigationDelegate protocol help you observe and handle changes to a NXNetwork object’s reachability.
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                    Sent to the delegate when the network object’s reachability status changes DeclarationObjective-C - (void)network:(nonnull NXNetwork *)network reachabilityStatusChanged:(NXNetworkReachabilityStatus)reachabilityStatus;ParametersnetworkThe network object who’s reachability has changed reachabilityStatusThe new reachabiltiy status 
 
            