Check internet connection in iPhone - not just to router

Question

I use the normal Reachability tools to check if there is an internet connection available. It works in most cases, but if I unplug the WAN cable to the wifi-router, for some reason it still say it can find the host by wifi. If I change the web address to something that doesn't exists, it will say "The internet is down", like it should. Where is my problem?

Example:

I. I have the "internet cable" unplugged, but phone connected by wifi to router. I run with this line, the first time for this domain:

hostReachable = [[Reachability reachabilityWithHostName: @"www.google.com"] retain];

Result = No host found (correct)

II. I disable wifi in the phone. Result = Host found with WWAN (correct)

III. I enable wifi in the phone. Result = Host found with WIFI. (not correct, since router is not online)

possible duplicate http://stackoverflow.com/questions/1083701/how-to-check-for-an-active-internet-connection-on-iphone-sdk — Ayaz, Feb 10 '14 at 09:38

score 0 · Accepted Answer · answered Jun 10 '11 at 13:01

0

For internet checking I send an http request to one site(most probably google.com) if it does not return true, it means no internet. This case works even the connection is so slow. Here is the method.

- (BOOL) connectedToInternet
{
    NSString *URLString = [NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://www.google.com"]];
return ( URLString != NULL ) ? YES : NO;
}

answered Jun 10 '11 at 13:01

murat hacioglu

166
2
10

Is the "stringWithContentsOfURL is depricated"-warning something to worry about? – Snilleblixten Jun 10 '11 at 13:16
Am I correct if this solution wait a minute before it give the result? In that case, it's not appropriate. – Snilleblixten Jun 10 '11 at 13:27
You should never use deprecated code as Apple will surely decline the application. – Jens Bergvall Jun 10 '11 at 13:50
It does not wait a minute. Why it is depracated? It works without a warning on my app. – murat hacioglu Jun 10 '11 at 14:45
I used something in this direction, but like this: http://stackoverflow.com/questions/2039203/what-is-the-stringwithcontentsofurl-replacement-for-objective-c – Snilleblixten Jun 10 '11 at 15:42
apple has changed the way of using 'encoding' to 'usedEncoding' – murat hacioglu Jun 11 '11 at 10:38
First of all stringWithContentsOfURL is deprecated and second this is blocking code. If your internet is DC from the router side this will give you control back somewhat after half minute sometimes. Not recommended – Ahmed Sep 15 '11 at 14:25

score 0 · Answer 2 · edited May 23 '17 at 12:20

0

You may want to check out this thread. The Reachability code is known to only test connectivity with your router. There should be a notification for connectivity now.

edited May 23 '17 at 12:20

Community

1
1

answered Jun 10 '11 at 13:01

uSlackr

743
5
19

I have followed that example. For me that would be enough, but I read somewhere that the app will not be approved in App Store if the app doesn't warn if the connection to the server disappears. – Snilleblixten Jun 10 '11 at 13:15

Check internet connection in iPhone - not just to router

2 Answers2