kReachabilityChangedNotification被多次调用

我正在使用Reachability类来检查我何时收到互联网连接。

这是我的代码：

  IN VIEW DID LOAD: internetReachable = [Reachability reachabilityForInternetConnection]; [internetReachable startNotifier]; // check if a pathway to a random host exists hostReachable = [Reachability reachabilityWithHostname:@"www.google.com"]; [hostReachable startNotifier]; Then the notification method -(void) checkNetworkStatus:(NSNotification *)notice { // called after network status changes NetworkStatus internetStatus = [internetReachable currentReachabilityStatus]; switch (internetStatus) { case NotReachable: { NSLog(@"The internet is down. IN AGENDA"); self.internetActive = NO; break; } case ReachableViaWiFi: { NSLog(@"The internet is working via WIFI.IN AGENDA"); self.internetActive = YES; break; } case ReachableViaWWAN: { NSLog(@"The internet is working via WWAN.IN AGENDA"); self.internetActive = YES; break; } } NetworkStatus hostStatus = [hostReachable currentReachabilityStatus]; switch (hostStatus) { case NotReachable: { NSLog(@"A gateway to the host server is down.IN AGENDA"); self.hostActive = NO; break; } case ReachableViaWiFi: { NSLog(@"A gateway to the host server is working via WIFI.IN AGENDA"); self.hostActive = YES; break; } case ReachableViaWWAN: { NSLog(@"A gateway to the host server is working via WWAN.IN AGENDA"); self.hostActive = YES; break; } } } And finally how I add en remove the observer -(void)viewWillAppear:(BOOL)animated{ [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkNetworkStatus:) name:kReachabilityChangedNotification object:nil]; } -(void)viewDidDisappear:(BOOL)animated{ [[NSNotificationCenter defaultCenter] removeObserver:self name:kReachabilityChangedNotification object:nil]; } 

问题

似乎viewcontroller多次获取通知。 这是我的NSLOG

 2014-01-04 10:32:16.299 Adsolut[10009:333b] CALLED reachabilityChanged 2014-01-04 10:32:16.299 Adsolut[10009:470b] CALLED reachabilityChanged 2014-01-04 10:32:16.300 Adsolut[10009:70b] The internet is down. IN AGENDA 2014-01-04 10:32:16.301 Adsolut[10009:70b] A gateway to the host server is down.IN AGENDA 2014-01-04 10:32:16.301 Adsolut[10009:70b] The internet is down. IN AGENDA 2014-01-04 10:32:16.302 Adsolut[10009:70b] A gateway to the host server is down.IN AGENDA 2014-01-04 10:32:16.313 Adsolut[10009:470b] CALLED reachabilityChanged 2014-01-04 10:32:16.313 Adsolut[10009:4a03] CALLED reachabilityChanged 2014-01-04 10:32:16.314 Adsolut[10009:70b] The internet is working via WIFI.IN AGENDA 2014-01-04 10:32:16.314 Adsolut[10009:333b] CALLED reachabilityChanged 2014-01-04 10:32:16.315 Adsolut[10009:70b] A gateway to the host server is down.IN AGENDA 2014-01-04 10:32:16.314 Adsolut[10009:f63] CALLED reachabilityChanged 2014-01-04 10:32:16.315 Adsolut[10009:70b] The internet is working via WIFI.IN AGENDA 2014-01-04 10:32:16.316 Adsolut[10009:70b] A gateway to the host server is down.IN AGENDA 2014-01-04 10:32:16.316 Adsolut[10009:70b] The internet is working via WIFI.IN AGENDA 2014-01-04 10:32:16.317 Adsolut[10009:70b] A gateway to the host server is down.IN AGENDA 2014-01-04 10:32:16.317 Adsolut[10009:70b] The internet is working via WIFI.IN AGENDA 2014-01-04 10:32:16.318 Adsolut[10009:70b] A gateway to the host server is down.IN AGENDA 

有人可以帮忙吗？

Answer 1

仅在appdelegate didFinishLaunchingWithOptions中添加可达性通知，并在appDelegate中设置Bool变量isInternetAvailable中的可达性值

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkNetworkStatus:) name:kReachabilityChangedNotification object:nil]; } - (void)checkNetworkStatus:(NSNotification *)notice { // called after network status changes NetworkStatus internetStatus = [self.internetReachable currentReachabilityStatus]; switch (internetStatus) { case NotReachable: { //#######NSLog(@"The internet is down."); self.isInternetAvailable = FALSE; break; } case ReachableViaWiFi: { //#######NSLog(@"The internet is working via WIFI"); self.isInternetAvailable = TRUE; break; } case ReachableViaWWAN: { //#######NSLog(@"The internet is working via WWAN!"); self.isInternetAvailable = TRUE; break; } default: { //#######NSLog(@"The internet is working via mobile SIM!"); self.isInternetAvailable = FALSE; break; } } }