typedef NS_ENUM(NSInteger, BMNetworkReachabilityStatus) {
    	BMNetworkReachabilityStatusUnknown          = -1,
    	BMNetworkReachabilityStatusNotReachable     = 0,
    	BMNetworkReachabilityStatusReachableViaWWAN = 1,
    	BMNetworkReachabilityStatusReachableViaWiFi = 2,
    	BMNetworkReachabilityStatusReachableVia2G   = 3,
    	BMNetworkReachabilityStatusReachableVia3G   = 4,
    	BMNetworkReachabilityStatusReachableVia4G   = 5,
	};

	- (void)dealloc{
    	BMRemoveNetworkStatusObserver(self);
	}
	- (void)viewDidLoad {
   	 [super viewDidLoad];
   	 BMAddNetworkStatusObserver(self);
	}
	
	#pragma mark - BMNetworkStatusProtocol
	- (void)networkStatusDidChangedFromStatus:(BMNetworkReachabilityStatus)fromStatus
                            	     toStatus:(BMNetworkReachabilityStatus)toStatus{
      	NSLog(@"*****************************************");
      	if (fromStatus != toStatus) { 
        	NSLog(@"========状态改变了啊=========");
      	}
     	 NSLog(@"fromStatus:  %@   toStatus: %@",@(fromStatus),@(toStatus));
      	NSString  *statusStr = [[BMEnvObserverCenterNetworkStatus defaultCenter] currentNetWorkStatusString];
      	NSLog(@"当前网络状态为: %@",statusStr);
	}