WiFi 连接可用时的通知答案

【问题标题】：Notification when WiFi connection availableWiFi 连接可用时的通知
【发布时间】：2015-05-07 18:46:41
【问题描述】：

当设备有 WiFi 连接可用或设备通过 WiFi 连接时，我需要通知。只有当 WiFi 可用时，我才需要做一些事情。

我使用了来自 Reachability 的以下代码：

BOOL status=true;

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

internetReachability = [Reachability reachabilityForInternetConnection];
[internetReachability startNotifier];

NetworkStatus internetNetworkStatus = [internetReachability currentReachabilityStatus];
status = (internetNetworkStatus == ReachableViaWiFi);

但是 checkNetworkStatus: 方法没有正确和准确地调用。所以，请指导我解决这个问题。

任何解决问题的帮助都必须感谢。

【问题讨论】：

标签： ios objective-c notifications wifi internet-connection

【解决方案1】：

希望对您的问题有所帮助。

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



self.internetConnectionReach = [Reachability reachabilityForInternetConnection];

self.internetConnectionReach.reachableBlock = ^(Reachability * reachability)
{

   NSLog(@"%@", reachability.currentReachabilityString);

    [[NSOperationQueue mainQueue] addOperationWithBlock:^{
  dispatch_async(dispatch_get_main_queue(), ^{

      // Do stuff here when WIFI is availble

     }];
};

self.internetConnectionReach.unreachableBlock = ^(Reachability * reachability)
{
  NSLog(@"%@", reachability.currentReachabilityString);
    dispatch_async(dispatch_get_main_queue(), ^{
      [[NSOperationQueue mainQueue] addOperationWithBlock:^{
        // do some stuff here when WIFI not present 
    }];
};    
[self.internetConnectionReach startNotifier];

}

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

     Reachability * reach = [note object];
     if (reach == self.localWiFiReach)
     {
     if([reach isReachable])
     {
     NSString * temp = [NSString stringWithFormat:@"LocalWIFI Notification Says Reachable(%@)", reach.currentReachabilityString];
     NSLog(@"%@", temp);
      }
     else
     {
     NSString * temp = [NSString stringWithFormat:@"LocalWIFI Notification Says Unreachable(%@)", reach.currentReachabilityString];
    NSLog(@"%@", temp);
     }
     }

}

【讨论】：

谢谢。让我实现它并在这里做评论。

【解决方案2】：

以下方法可以帮助我解决我的问题：

// Use below to any method
// check for internet connection
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkNetworkStatus:) name:kReachabilityChangedNotification object:nil];

internetReachability = [Reachability reachabilityForInternetConnection];
[internetReachability startNotifier];


-(void) checkNetworkStatus:(NSNotification *)notice {
    // called after network status changes
    NetworkStatus internetStatus = [internetReachability currentReachabilityStatus];

    switch (internetStatus) {
        case NotReachable: {
            NSLog(@"The internet is down.");
            break;
        }

        case ReachableViaWiFi: {
            NSLog(@"The internet is working via WIFI.");
            //Remove Observer
            [[NSNotificationCenter defaultCenter] removeObserver:self name:kReachabilityChangedNotification object:nil];
            [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkNetworkStatus:) name:kReachabilityChangedNotification object:nil];

            //Write your code                
            break;
        }

        case ReachableViaWWAN: {
            NSLog(@"The internet is working via WWAN.");
            break;
        }
    }
}

【讨论】：