Navigating back to UIViewController from TableViewController using NSNotifications - ios

Question

I have an exception like this:
Thread 1: EXC_Breakpoint (code = EXC_I386_BPT,subcode=0x0)
In my story board i have 3 controllers. Navigation controller, UIViewController and then a tableviewcontroller. When the app first launches UIViewController is shown. I add some stuff to the Core Data DB. Then on this controller itself i have a "Check Records" bar button. I click that and move to the 3rd controller the tableviewcontroller. Here i can see the records that i added on that day. I click the one i just added and traverse back to the UIviewcontroller screen using NSNotifications like this:
//This code is in tableviewcontroller.didSelectRowAtIndexPath
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
ITMAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
appDelegate.salesOrderObject = [self.salesOrdersArray objectAtIndex:indexPath.row];
NSNotification *notification =[NSNotification notificationWithName:#"reloadRequest"
object:self];
[[NSNotificationCenter defaultCenter] postNotification : notification];
[self.navigationController popViewControllerAnimated:YES];
}
In my ViewController viewDidLoad i write this code to listen to the notification.
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(newReloadData)
name:#"reloadRequest"
object:nil];
-(void)newReloadData
{
self.salesOrder = self.appDelegate.salesOrderObject; //self.reloadedSOObject; //appDelegate.salesOrderObject;
if(self.salesOrder !=nil)
{
//I add UItextviews,textfields,buttons etc here to a scrollview.
ITMCustomView *cView = [[ITMCustomView alloc] initWithFrame:CGRectMake(187, 660, 400, 400)
andOrderedItem:#"New"
andTag:self.tagNumber
withFoldArray:self.foldTypeArray
withRollArray:self.rollTypeArray];
cView.tag =self.tagNumber;
NSLog(#"Assigned tag is %d",cView.tag);
cView.delegate = self;
//[self.scrollView addSubview:customView];
//self.scrollView.contentSize = CGRectMake(187, 660, 400, 400).size;
CGPoint scrollPoint = CGPointMake(0.0, (cView.frame.origin.y/500)*400);
[self.scrollView setContentOffset:scrollPoint animated:YES];
[self.scrollView addSubview:cView];
CGFloat scrollViewHeight = 0.0f;
for (UIView *view in self.scrollView.subviews)
{
scrollViewHeight += view.frame.size.height;
}
CGSize newSize = CGSizeMake(320,scrollViewHeight);
//CGRect newFrame = (CGRect){CGPointZero,newSize};
[self.scrollView setContentSize:newSize];
NSLog(#"750 the tag number is %d",self.tagNumber);
NSLog(#"the scroll view height is %f",scrollViewHeight);
self.currentCGRectLocation = cView.frame;
}
}
I am thinking if the exception occurs at adding something to scroll view.Or on looking some more on stack overflow it could be either because of delegate or NSnotification. I cant figure out why and where the exception occurs.Does writing this line of code give me this exception?
[self.navigationController popViewControllerAnimated:YES];
this question is extension of this question
Adding Customview to UIScrollview results in stuck screen when Scrolling
I have no idea where/how its getting this exception. If you need more info please ask. Thanks...

Answer 1

One thing might be when you call newReloadData you notify notification center that what class has#"reloadRequest" string with newReloadData method should run it, so you need to first pop the view then call the notification
Just try change the line order first call [self.navigationController popViewControllerAnimated:YES]; then call [[NSNotificationCenter defaultCenter] postNotification : notification];
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
ITMAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
appDelegate.salesOrderObject = [self.salesOrdersArray objectAtIndex:indexPath.row];
NSNotification *notification =[NSNotification notificationWithName:#"reloadRequest"
object:self];
//here first pop view
[self.navigationController popViewControllerAnimated:YES];
//then send notification before scopes end
[[NSNotificationCenter defaultCenter] postNotification : notification];
}