如何从iOS可达性类更改网络连接通知？

Reachability* reachability = [Reachability reachabilityForInternetConnection];
        [reachability startNotifier];
        [[NsnotificationCenter defaultCenter] addObserver:self SELEctor:@SELEctor(reachabilityChanged:) name:kReachabilityChangedNotification object:nil];

- (void)reachabilityChanged:(Nsnotification*)notification
{
    Reachability* reachability = notification.object;
    if(reachability.currentReachabilityStatus == NotReachablE)
        NSLog(@"Internet off");
    else
        NSLog(@"Internet on");
}

解决方法

@property (nonatomic,assign) BOOL hasInet;

.M

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    [self setUpRechability];
}


-(void)setUpRechability
{
    [[NsnotificationCenter defaultCenter] addObserver:self SELEctor:@SELEctor(handleNetworkChange:) name:kReachabilityChangedNotification object:nil];

    reachability = [Reachability reachabilityForInternetConnection];
    [reachability startNotifier];

    NetworkStatus remoteHostStatus = [reachability currentReachabilityStatus];

    if          (remoteHostStatus == NotReachablE)      {NSLog(@"no");      self.hasInet-=NO;   }
    else if     (remoteHostStatus == ReachableViaWiFi)  {NSLog(@"wifi");    self.hasInet-=YES;  }
    else if     (remoteHostStatus == ReachableViaWWAN)  {NSLog(@"cell");    self.hasInet-=YES;  }

}

- (void) handleNetworkChange:(Nsnotification *)notice
{
    NetworkStatus remoteHostStatus = [reachability currentReachabilityStatus];

    if          (remoteHostStatus == NotReachablE)      {NSLog(@"no");      self.hasInet-=NO;   }
    else if     (remoteHostStatus == ReachableViaWiFi)  {NSLog(@"wifi");    self.hasInet-=YES;  }
    else if     (remoteHostStatus == ReachableViaWWAN)  {NSLog(@"cell");    self.hasInet-=YES;  }

//    if (self.hasInet) {
//        UIAlertView *alert=[[UIAlertView alloc]initWithtitle:@"Net avail" message:@"" delegate:self cancelButtontitle:OK_EN otherButtontitles:nil,nil];
//        [alert show];
//    }
}