objective c - Capture Wi-Fi network changing event in iOS

Question

Is there any way to capture the event occurs when a user connects to a particular WiFi network in iOS app. It is fine even if this can be achieved using any private library which doesn't require super user privileges (jail break). I just want to capture the changing event of the connected SSID.

Answer 1

I would recommend simply using what Larme posted, and setting up an NSTimer to check every second or so, what the SSID of your current network is, if you detect a change, simply do whatever you need to do. Keep in mind, changing WiFi networks is not something that happens instantaneously, so having a 1 second resolution is not bad

In applicationDidFinishLoading

NSTimer *ssidTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(fetchSSIDInfo) userInfo:nil repeats:YES];

In AppDelegate

- (id)fetchSSIDInfo {
     NSArray *ifs = (__bridge_transfer id)CNCopySupportedInterfaces();
     NSLog(@"Supported interfaces: %@", ifs);
     id info = nil;
     NSString *ifnam = @"";
     for (ifnam in ifs) {
         info = (__bridge_transfer id)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifnam);
         NSLog(@"%@ => %@", ifnam, info);
         if (info && [info count]) { break; }
     }
     if ([info count] >= 1 && [ifnam caseInsensitiveCompare:prevSSID] !=  NSOrderedSame) {
          // Trigger some event
          prevSSID = ifnam;
     }

     return info;
}

Something like that. I can not check if code is typo free as I am not in front of a mac, but it should not be too different