reachability alway return NotReach - ios

Question

i use reachability to detect network change. the first time its ok with wifi available. but then i turn off wifi then turn on, it alway return NotReach
Reachability *internetChecker;
[[NSNotificationCenter defaultCenter]addObserver:self selector:#selector(myMethod:) name:kReachabilityChangedNotification object:nil];
internetChecker = [Reachability reachabilityWithHostName:#"www.24h.com.vn"];
[internetChecker startNotifier];
in mymethod:
NetworkStatus status = [internetChecker currentReachabilityStatus];
switch (status) {
case NotReachable:
{
NSLog(#"no wifi");
break;
}
default:
{
NSLog(#"wifi");
break;
}
}

Answer 1

Do you have separate Reachability properties for the Internet and the Host?
#property (nonatomic) Reachability *internetReachability;
#property (nonatomic) Reachability *hostReachability;
Then do this:
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(myMethod:) name:kReachabilityChangedNotification object:nil];
self.internetReachability = [Reachability reachabilityForInternetConnection];
[self.internetReachability startNotifier];
[self updateInterfaceWithReachability:self.internetReachability];
self.hostReachability = [Reachability reachabilityWithHostName:#"www.24h.com.vn"];
[self.hostReachability startNotifier];
[self updateInterfaceWithReachability:self.hostReachability];
Then myMethod:
- (void)myMethod:(NSNotification *)note
{
Reachability* curReach = [note object];
NSParameterAssert([curReach isKindOfClass:[Reachability class]]);
[self updateInterfaceWithReachability:curReach];
}
And updateInterfaceWithReachability:
- (void)updateInterfaceWithReachability:(Reachability *)reachability {
NetworkStatus netStatus = [reachability currentReachabilityStatus];
if (reachability == self.internetReachability) {
switch (netStatus) {
case NotReachable:
NSLog(#"no internet");
break;
case ReachableViaWWAN:
case ReachableViaWiFi:
NSLog(#"with internet");
break;
}
}
if (reachability == self.hostReachability) {
switch (netStatus) {
case NotReachable:
NSLog(#"www.24h.com.vn unavailable");
break;
case ReachableViaWWAN:
case ReachableViaWiFi:
NSLog(#"www.24h.com.vn available");
break;
}
}

Answer 2

Try below solution
+ (BOOL)checkInternetConnection
{
Reachability *reachability = [Reachability reachabilityForInternetConnection];
NetworkStatus remoteHostStatus = [reachability currentReachabilityStatus];
if (remoteHostStatus == NotReachable)
{
return FALSE;
}
else
{
return TRUE;
}
}
you have to modify this line
Reachability * internetChecker = [Reachability reachabilityForInternetConnection];
Hope it helps you..!

Answer 3

done! i dont know how but its seem notification center only detect when network change. When it notice the status is still NotReachable. So i check for the network after 2s delay. It work!