EXC_BAD_ACCESS EXC_I386_GPFLT while click on button - objective-c

Question

i have a UIViewController with UITableView, when the tableView is empty i want to show another view so i am using this
[self.tableView setHidden:YES];
NoKidsViewController *noKids = [self.storyboard instantiateViewControllerWithIdentifier:#"NoKidsView"];
[self.view addSubview:noKids.view];
all is fine, i'm able to see the view. but when i tap on one of the buttons in it i'm getting the EXC_BAD_ACCESS EXC_I386_GPFLT error.
//NoKidsViewController
- (IBAction)addNewKid:(id)sender {
AddKid *addKidController = [self.storyboard instantiateViewControllerWithIdentifier:#"AddKid"];
[self.navigationController pushViewController:addKidController animated:YES];
}
- (IBAction)saleSpot:(id)sender {
SaleSpot *saleSpotController = [self.storyboard instantiateViewControllerWithIdentifier:#"AddKid"];
[self.navigationController pushViewController:saleSpotController animated:YES];
}
i searched the net over 3 hours trying to find any solution w/o success. what could cause that error? and how can i fix it?

Answer 1

The noKids controller is going out of scope and being deallocated. This is what is often referred to as a zombie object.
You need to add the noKids controller to the childViewControllers of the containing controller.
NoKidsViewController *noKids = [self.storyboard instantiateViewControllerWithIdentifier:#"NoKidsView"];
[self addChildViewController:noKids];
[self.view addSubview:noKids.view];
[noKids didMoveToParentViewController:self];
This will retain the NoKidsViewController as well as allow the view controller methods to pass down to it. For more information on creating your custom container view controller:
https://developer.apple.com/library/ios/featuredarticles/ViewControllerPGforiPhoneOS/CreatingCustomContainerViewControllers/CreatingCustomContainerViewControllers.html