如何检测网络的变化与可达性？ [英] How to detect change in network with Reachability?

问题描述

我目前正在使用以下方式检查 viewDidLoad 上的网络连接：

   - （BOOL）reachable {
 ReachabilityDRC * r = [ReachabilityDRC reachabilityWithHostName：@google.com]; 
 NetworkStatus internetStatus = [r currentReachabilityStatus]; 
 if（internetStatus == NotReachable）{
 return NO; 
} 
 return YES; 
} 
  

但我也希望在网络发生变化时

如何调整我的方法来做这样的事情？

$ b $另一个可能的解决方案是在应用程序didfinishlaunching中添加一个NS通知：

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

并在checkForReachability方法中执行：

 可达性* reachability = [Reachability reachabilityForInternetConnection]; 
 [reachability startNotifier]; 
 
 NetworkStatus remoteHostStatus = [reachability currentReachabilityStatus]; 
 
 if（remoteHostStatus == NotReachable）{
 //做某事
} 
 else if（remoteHostStatus == ReachableViaWiFi）{
 //做某事
} 
 else {
 
 //另做别的
} 
  

I'm currently checking network connection on viewDidLoad using this:

-(BOOL)reachable {
    ReachabilityDRC *r = [ReachabilityDRC reachabilityWithHostName:@"google.com"];
    NetworkStatus internetStatus = [r currentReachabilityStatus];
    if(internetStatus == NotReachable) {
        return NO;
    }
    return YES;
}

But I also want to be notified if there is a change of network, such as wifi dropped, or wifi is back, so I can make changes accordingly.

How can I adjust my method to do something like that?

解决方案

Another possible solution is to add a NS Notification in "application didfinishlaunching":

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

and in checkForReachability method do this:

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

    NetworkStatus remoteHostStatus = [reachability currentReachabilityStatus];

    if(remoteHostStatus == NotReachable) {
        //Do something
    }
     else if (remoteHostStatus == ReachableViaWiFi) {
    // Do something
 }
    else{

// Else do something else
}

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