- (void)loadView 
{
	PurchaseWindowViewController* vc = [[PurchaseWindowViewController alloc] initWithNibName:@"PurchaseWindowViewController" bundle:nil];

	pc = [[UIPopoverController alloc] initWithContentViewController:vc];
	
	CGRect rect = CGRectMake((self.view.bounds.size.width - 300)/2, (self.view.bounds.size.height - 400)/2, 300, 400);
	pc.popoverContentSize = rect.size;
	
	[pc presentPopoverFromRect:rect inView:self.view permittedArrowDirections:0 animated:YES];
	
    [super viewDidLoad];
	
}

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
	CGRect rect = CGRectMake((self.view.bounds.size.width - 300)/2, (self.view.bounds.size.height - 400)/2, 300, 400);
	pc.popoverContentSize = rect.size;
}

Show UIPopoverController

c, iphone

Objective C