不断检测互联网连接 [英] Detecting internet connectivity continually

问题描述

我希望我的应用能够自动检测互联网连接丢失.所以我使用以下代码.

I want my app to detect the internet connection loss automatically. So im using the following code.

- (void)applicationDidBecomeActive:(UIApplication *)application {

    Reachability *networkReachability = [Reachability reachabilityForInternetConnection];
    NetworkStatus networkStatus = [networkReachability currentReachabilityStatus];
    if (networkStatus == NotReachable) {
        [Settings hideSpinner];
         //Show no internet connectivity dialog.
    } else {
    }
}

但问题是它没有持续检查互联网连接.它仅在应用程序处于活动状态时进行检查.如何在整个应用生命周期内持续检查互联网连接并在互联网自动关闭时发出警告?

But the problem is that it is not checking the internet connectivity continually. it checks only when the app has become active. How can I be able to check for internet connection continually throughout the app life cycle and throw an warning if internet goes off automatically?

推荐答案

在 Reachability 方法中像这样添加 obeserver.

Add obeserver like this in Reachability method.

1) [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil];

它会在您的应用打开/处于后台模式时自动调用，并调用reachabilityChanged.

It will call automatically when your app open/in background mode and it call reachabilityChanged.

2) [[NSNotificationCenter defaultCenter] postNotificationName:@"ChangeInternetConnection" object:nil];

ChangeInternetConnection 您必须将观察者添加到您的 ViewController 以在互联网更改其状态时获取状态.

ChangeInternetConnection you have to add observer to your ViewController to get status when internet changing it's status.

 - (void) checkInternetConnetion {

        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil];

        //NSString *remoteHostName = @"www.apple.com";


    self.internetReachability = [Reachability reachabilityForInternetConnection];
        [self.internetReachability startNotifier];
        [self updateInterfaceWithReachability:self.internetReachability];
    }


    #pragma mark - Reachability Methods

    - (void)updateInterfaceWithReachability:(Reachability *)reachability {
     if (reachability == self.internetReachability) {
            [self checkStatus:reachability];
        }

        if (reachability == self.wifiReachability) {
            [self checkStatus:reachability];
        }
    }


    -(void)checkStatus :(Reachability *)reachability {

        NetworkStatus netStatus = [reachability currentReachabilityStatus];
        BOOL connectionRequired = [reachability connectionRequired];
        NSString* statusString = @"";

        switch (netStatus) {

            case NotReachable: {

               self.isInternetOn = FALSE;

                break;
            }

            case ReachableViaWWAN: {
                self.isInternetOn = TRUE;

                break;
            }
            case ReachableViaWiFi: {
                self.isInternetOn = TRUE;

                break;
            }
        }



        [[NSNotificationCenter defaultCenter] postNotificationName:@"ChangeInternetConnection" object:nil];

      }

    - (void) reachabilityChanged:(NSNotification *)note {

        Reachability* curReach = [note object];
        NSParameterAssert([curReach isKindOfClass:[Reachability class]]);
        [self updateInterfaceWithReachability:curReach];
    }

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