Question

I need to call a method in the viewcontroller that creates a popupviewcontroller, from the created popupviewcontroller.

For iPad I create it like this:

if (!self.flipsidePopoverController) {
    FlipsideViewController *controller = [[[FlipsideViewController alloc] initWithNibName:@"FlipsideViewController" bundle:nil] autorelease];
    controller.delegate = self;
    self.flipsidePopoverController = [[[UIPopoverController alloc] initWithContentViewController:controller] autorelease];
}
if ([self.flipsidePopoverController isPopoverVisible]) {
    [self.flipsidePopoverController dismissPopoverAnimated:YES];
}
else
{
    /// The important part ///
    [self.flipsidePopoverController presentPopoverFromRect:CGRectMake((self.view.frame.size.width-320), 0, (self.view.frame.size.width), 10) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];
}

Now I wish to call a method in my main view controller from within the popup. How can I achieve that?

---

My iPhone equivalent is this:

// Creating it //
FlipsideViewController *controller = [[[FlipsideViewController alloc] initWithNibName:@"FlipsideViewController" bundle:nil] autorelease];
controller.delegate = self;
controller.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:controller animated:YES];

Calling a method from within the popup:

if ([self.presentingViewController isKindOfClass:[MainViewController class]])
    [(MainViewController*)self.presentingViewController resetClock];

Answer 1

Give the displayed view controller a reference to your main view controller. Eg:

@class MainViewController;
@interface FlipsideViewController : UIViewController
{
}

@property (nonatomic, assign) MainViewController *mainController;

@end

(Don’t forget the @synthesize in the implementation!)
Later when you present the popover, just set the property:

[controller setMainController:self];