App crashing. Control not moving to catch statement - ios

Question

When the webservice is reachable, the code is working fine, but when it is unreachable, the app crashes. Why isn't the control going to #catch ??
-(void)callRegisterWebService:(NSString *)fname lastName:(NSString *)lName email:(NSString *)email
{
[self.view endEditing:YES];
UIActivityIndicatorView *activity = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
[self.view addSubview:activity];
activity.center = self.view.center;
[self.view bringSubviewToFront:activity];
activity.hidesWhenStopped = YES;
[activity setHidden:NO];
[activity startAnimating];
NSOperationQueue *q = [NSOperationQueue mainQueue];
NSString *serviceURL = [NSString stringWithFormat:#"https://aagaka];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:serviceURL]];
#try
{
[NSURLConnection sendAsynchronousRequest:request queue:q completionHandler:^(NSURLResponse *serviceResponse, NSData *responseData, NSError *err) {
NSMutableDictionary *parsedData = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingMutableContainers error:&err];
[activity stopAnimating];
if(!parsedData)
{
NSLog(#"data not parsed");
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"ERROR" message:#"Problem in Network. Please Try Again!" delegate:self cancelButtonTitle:#"OK" otherButtonTitles: nil];
[alert show];
}
else
{
NSLog(#"parsed");
NSLog(#"parsed.. the size is %lu", (unsigned long)[parsedData count]);
NSLog(#"%#", parsedData);
NSString *status = [parsedData objectForKey:#"Status"];
NSLog(#"the status is %#", status);
if([status isEqualToString:#"Success"])
{
NSString *uniqueNumber = [parsedData objectForKey:#"UniqueNum"];
[self saveEmailAndUniqueNumberToDatabase:fname lastName:lName Email:email Number:uniqueNumber];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NULL message:#"Authentication Token Has Been Sent To Your Email-ID!" delegate:self cancelButtonTitle:#"OK" otherButtonTitles: nil];
[alert show];
[self.verifyView setHidden:NO];
[self.registerView setHidden:YES];
[self.verifyButtonTab setEnabled:YES];
[self.verifyButtonTab setSelected:YES];
[self.registerButtonTab setSelected:NO];
}
else if([status isEqualToString:#"Failed"])
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Not An Authorized User" message:#"Please Contact Admin To Get Access" delegate:self cancelButtonTitle:#"Ok" otherButtonTitles:nil];
[alert show];
[self.verifyView setHidden:YES];
[self.registerView setHidden:NO];
[self.verifyButtonTab setEnabled:NO];
[self.registerButtonTab setSelected:YES];
}
else
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"ERROR" message:#"Problem in Network. Please Try Again!" delegate:self cancelButtonTitle:#"OK" otherButtonTitles: nil];
[alert show];
[self.verifyView setHidden:YES];
[self.registerView setHidden:NO];
[self.verifyButtonTab setEnabled:NO];
[self.registerButtonTab setSelected:YES];
}
}
}];
}
#catch (NSException *exception)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NULL message:#"Problem In Network Connection. Please Try Again!" delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alert show];
[self.verifyView setHidden:YES];
[self.registerView setHidden:NO];
[self.verifyButtonTab setEnabled:NO];
[self.registerButtonTab setSelected:YES];
}
#finally {
}
}

Answer 1

If the error occurs with te block the try catch in not going to called since the block is executed in a different context.
Move the try try catch in the block of the completionHandler: and it should work.