Switch to UITableView controller and scroll to start of section

Question

Good Morning,

I'm hoping someone would be able to shed some light on how i can switch from a ViewController nested in a tab bar controller to another ViewController nested in a navigation controller nested in the tab bar controller, and then scroll the table view in the section navigation controller to a specific section.

I have found at least what i need to switch the tab bar controllers with

[self.applicationTabBarController setSelectedIndex:1];

and i am able to get a reference to the second view controller with

UINavigationController *secondTabNavController = (UINavigationController *)[[self.applicationTabBarController viewControllers] objectAtIndex:1];

MyViewController *myViewController = (MyViewController *)[[ordersNav viewControllers] objectAtIndex:0];

But what i am unclear about is how i can scroll the UITableView to the specific section. I tried

NSIndexPath *myPath = [NSIndexPath indexPathForRow:0 inSection:3];

[myViewController.ordersTableView scrollToRowAtIndexPath:myPath atScrollPosition:UITableViewScrollPositionTop animated:NO];

Assuming of course, that the second view has been loaded, and has a section 3.

And lastly, my first view controller calls the above code that resides in the app delegate.

Thank you.

Answer 1

You need to be careful where you put that scrollToRowAtIndexPath call. If you put it before the view loads, it may be running that method on nil. I would say have a function in myViewController called scrollToRowAtIndexPath: which determines if the view is currently displayed, and if it is, just calls the tableView version. If not, save the indexPath until viewWillAppear: is called and run it then.