IOS: accessibility - startNotifier does not work after returning to the application

Question

I have Reachability working exactly as suggested in this thread.

I use open source accessibility . However, I do not use blocks, but notifications, so this process is very similar to Apple Reachability code.

The first time I launch the application, I launch it and it works great.

Reachability *reachability = [reach hostReachability];
[reachability startNotifier];

Availability: changed event:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachability_Changed:) name:kReachabilityChangedNotification object:nil];

However, as soon as I press the home button and return to the application, it startNotifierreturns NO instead of YES.

    // Set it as our reachability queue, which will retain the queue
    if(!SCNetworkReachabilitySetDispatchQueue(self.reachabilityRef, self.reachabilitySerialQueue))
    {
#ifdef DEBUG
        NSLog(@"SCNetworkReachabilitySetDispatchQueue() failed: %s", SCErrorString(SCError()));
#endif
      ...
      return NO;

and therefore, the above event never fires again.

If I use it incorrectly, but startNotifiershould I call it only once in init, when the possibility of achievement is achieved and never again?

self.hostReachability = [Reachability reachabilityWithHostname:_HOST];

Answer 1

[self.hostReachability startNotifier] /. , , - :

• tonymillion/Reachability.

• Reachability, , , .

  @interface ViewController () {
    NSString *_HOST;
  }
  @property Reachability *hostReachability;
  @end
  

• , .

  - (void)viewDidLoad
  {
    [super viewDidLoad];
  
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(reachabilityChanged:)
                                                 name:kReachabilityChangedNotification
                                               object:nil];
  
    _HOST = @"www.google.com";
    self.hostReachability = [Reachability reachabilityWithHostname:_HOST];
    [self.hostReachability startNotifier];
  }
  
  - (void)viewDidUnload
  {
    [super viewDidUnload];
  
    [[NSNotificationCenter defaultCenter] removeObserver:self];
  }
  

• , reachabilityChanged: Reachability, .

  - (void)reachabilityChanged:(NSNotification*)notification
  {
    Reachability *notifier = [notification object];
    NSLog(@"%@", [notifier currentReachabilityString]);
  }
  

. "" , "" .