Checking Network Availability - iphone

Question

I use reacheability class for checking my network connectivity in my app...
Reachability *reach = [Reachability reachabilityForInternetConnection];
NetworkStatus netStatus = [reach currentReachabilityStatus];
if (netStatus==NotReachable)
{
NSLog(#"NR");
}
I need to find when the network status change (i.e when the network status changes from reachable to notreachable and vice versa).
Is there any delegates to find this thinks, Any suggestions ?

Answer 1

I suggest to make use of Apple's Reachability class. Here is a sample App by Apple.
and also check this links.
http://www.switchonthecode.com/tutorials/iphone-snippet-detecting-network-status

Answer 2

Used this flag kReachabilityChangedNotification to find the change in network status and passed that to a NSNotificationCenter
Here is the code:
NSString *host = #"https://www.apple.com"; // Put your host here
// Set up host reach property
hostReach = [Reachability reachabilityWithHostname:host];
// Enable the status notifications
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil];
[hostReach startNotifier];
- (void) reachabilityChanged: (NSNotification* )note
{
Reachability *reachability = [note object];
NSParameterAssert([reachability isKindOfClass:[Reachability class]]);
if (reachability == hostReach) {
Reachability *reach = [Reachability reachabilityForInternetConnection];
NetworkStatus netStatus = [reach currentReachabilityStatus];
if (netStatus==NotReachable)
{
NSLog(#"notreacheable");
}
else {
NSLog(#"reacheable");
[[NSNotificationCenter defaultCenter]postNotificationName:#"startUpdatingTable" object:nil];
}
}
}

Answer 3

use Reachability" class
add flooding method in app delegate so you can use this method any ware in project
#import "Reachability.h"
-(BOOL)isHostAvailable
{
//return NO; // force for offline testing
Reachability *hostReach = [Reachability reachabilityForInternetConnection];
NetworkStatus netStatus = [hostReach currentReachabilityStatus];
return !(netStatus == NotReachable);
}