Where to set popover size?

I have a UIViewController called HomeViewController and it has a model that contains an array of data. HomeViewController also has a button that when pressed will show a UITableViewController that display's the model's array of data.

My question is, what is the standard/best way to set the popover's size? I only want the popover to be tall enough to display the data, but no taller. What is common practice? I assume that I need to set contentSizeForViewInPopover at some point but I'm not sure where...In the viewDidLoad method of the popover class? In the prepareForSegue method?

Here's the code I have so far: (Note that DataPresentingViewController is my popover view controller class`)

//In HomeViewController
- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if([segue.destinationViewController isKindOfClass:[DataPresentingViewController class]])
    {
        DataPresentingViewController *dest = (DataPresentingViewController *) segue.destinationViewController;
        dest.mySavedData = self.myModel.mySavedData;
    }
}

I know that I could just set the contentSizeForViewInPopover here in the prepareForSegue method; however, this seems like something the popover class should deal with.