Pattern for -init methods of controllers designed in a storyboard

controller.m

- (id)init
{
  UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainInterface" bundle:nil];
  self = [storyboard instantiateViewControllerWithIdentifier:@"MyControllerIdentifier"];

  // Set up ivars here. 'self' won't be nil; if it is, you passed an invalid identifier
  // and UIKit would have thrown an exception anyway.

  return self;
}

This results in an extra alloc.

How about:

+ (id)instance
{
  return [[UIStoryboard storyboardWithName:@"Foo" bundle:nil] instantiateViewControllerWithIdentifier:@"Bar"];
}

instead?