Comments on: Code: Reachability

By: DDG Reachability at Under The Bridge

DDG Reachability at Under The Bridge — Sun, 31 Jan 2010 05:53:09 +0000

[...] as you no doubt know if you’ve been reading us for a while, your iPhone programs need to go figure out for themselves the status of the network connection [...]

By: Anonymous

Anonymous — Sun, 17 May 2009 08:16:07 +0000

Problem with this sample is with the cache (reachabilityQueries). When we first set NetworkStatusNotificationsEnabled to NO then the value of SCNetworkReachabilityRef will be cached but if we chanaged notification to YES, the notification won’t by registered in current run loop.
In my solution I added property to the ReachabilityQuery – networkstatusnotificationenabled – and a method to the Reachability which I call after changing networkStatusNotification; the method:
- (BOOL)updateNetworkStatusNotification
{
if (![self hostName] || ![[self hostName] length]) {
return NO;
}
ReachabilityQuery *cachedQuery = [self.reachabilityQueries objectForKey:[self hostName]];
if(cachedQuery.networkStatusNotificationsEnabled != [self networkStatusNotificationsEnabled]){
[cachedQuery scheduleOnRunLoop:[NSRunLoop currentRunLoop]];
}
return YES;
}

so from client code we have:
[[Reachability sharedReachability] setHostName:[self hostName]];
[self updateStatus];
[[Reachability sharedReachability] setNetworkStatusNotificationsEnabled:YES];
[[Reachability sharedReachability] updateNetworkStatusNotification];

By: quack

quack — Sun, 17 May 2009 06:16:17 +0000

there isn’t a bug in apples code there’s an issue with the sample. don’t think the whole file was meant to be cut and pasted. use the SCNetwork functions they call in the example.

By: luk

luk — Sat, 16 May 2009 17:39:15 +0000

Your solution helps as you described – but when I put this in my application I’m not getting notification when connectivity was changed

By: Aatif

Aatif — Tue, 05 May 2009 09:58:31 +0000

thanks, can u or somebody suggest the minimum required stuff to add a ‘check’ for internet connectivity in my existing application?

By: Paul Robinson

Paul Robinson — Sat, 02 May 2009 11:30:04 +0000

Nice tip. Thanks for posting this.

By: iPhoneKicks.com

iPhoneKicks.com — Sat, 02 May 2009 08:23:37 +0000

Detecting Networking Host Reachability…

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