iPhone Dev - Scrolling to a new position in a tableview that is currently off-screen

Say for example I have a tab bar controller where one of its views is a tableviewcontroller, and another one is some other view. The other view has a button in it that when pressed, should make it so the tableview (which is not on the screen while you're pressing the button) repositions itself so that some specified cell is now the top one being displayed when the tableview is again displayed.

My question is this: can I just call [myTableVC.tableView scrollToRowAtIndexPath:someIndex] from inside the other class when the button is pushed? Or does the view actually have to be on the screen when scrollToRowAtIndexPath is called for it to change the top 开发者_运维知识库cell that will be displayed?

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You may be able to, but you probably shouldn’t—calling view or tableView on an offscreen view controller may cause its view to get loaded into memory unnecessarily. Just set a property—a CGFloat or whatever—on the view controller for the scroll position that it should be at when it appears, and scroll to that position in the controller’s -viewDidLoad or -viewWillAppear:animated:.