Singleton popover manager to enforce the one popover at at time rule. MIT license, help yourself

LRPopoverManager.h

//
//  LRPopoverManager.h
//  Spark
//
//  Created by Luke Redpath on 24/05/2010.
//  Copyright 2010 LJR Software Limited. All rights reserved.
//

#import <Foundation/Foundation.h>

extern NSString *const LRUIPopoverControllerDidDismissNotification;

@interface LRPopoverManager : NSObject <UIPopoverControllerDelegate> {
  UIPopoverController *currentPopoverController;
  BOOL permitCurrentPopoverControllerToDismiss;
}
@property (nonatomic, retain) UIPopoverController *currentPopoverController;
@property (nonatomic, assign) BOOL permitCurrentPopoverControllerToDismiss;

+ (id)sharedManager;

- (void)presentPopoverController:(UIPopoverController *)pc fromRect:(CGRect)rect inView:(UIView *)view permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections animated:(BOOL)animated;
- (void)presentPopoverController:(UIPopoverController *)pc fromBarButtonItem:(UIBarButtonItem *)item permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections animated:(BOOL)animated;

- (void)presentControllerInPopoverController:(UIViewController *)vc fromRect:(CGRect)rect inView:(UIView *)view permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections animated:(BOOL)animated;
- (void)presentControllerInPopoverController:(UIViewController *)vc fromBarButtonItem:(UIBarButtonItem *)item permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections animated:(BOOL)animated;

- (void)dismissCurrentPopoverController:(BOOL)animated;
@end

LRPopoverManager.m

//
//  LRPopoverManager.m
//  Spark
//
//  Created by Luke Redpath on 24/05/2010.
//  Copyright 2010 LJR Software Limited. All rights reserved.
//

#import "LRPopoverManager.h"


NSString *const LRUIPopoverControllerDidDismissNotification = @"LRUIPopoverControllerDidDismissNotification";

@implementation LRPopoverManager

@synthesize currentPopoverController;
@synthesize permitCurrentPopoverControllerToDismiss;

static LRPopoverManager *sharedManager = nil;

+ (void)initialize {
  if (self == [LRPopoverManager class]) {
    sharedManager = [[self alloc] init];
    sharedManager.permitCurrentPopoverControllerToDismiss = YES;
  }
}

+ (id)sharedManager {
  return sharedManager;
}

- (void)setCurrentPopoverController:(UIPopoverController *)pc
{
  [self dismissCurrentPopoverController:YES];
  
  if (pc != currentPopoverController) {
    [currentPopoverController release];
    currentPopoverController = [pc retain];
    currentPopoverController.delegate = self;
  }
  self.permitCurrentPopoverControllerToDismiss = YES;
}

- (void)presentPopoverController:(UIPopoverController *)pc fromRect:(CGRect)rect inView:(UIView *)view permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections animated:(BOOL)animated
{
  self.currentPopoverController = pc;
  [self.currentPopoverController presentPopoverFromRect:rect inView:view permittedArrowDirections:arrowDirections animated:animated];
}

- (void)presentPopoverController:(UIPopoverController *)pc fromBarButtonItem:(UIBarButtonItem *)item permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections animated:(BOOL)animated
{
  self.currentPopoverController = pc;
  [self.currentPopoverController presentPopoverFromBarButtonItem:item permittedArrowDirections:arrowDirections animated:animated];
}

- (void)dismissCurrentPopoverController:(BOOL)animated;
{
  [self.currentPopoverController dismissPopoverAnimated:animated];
}

- (void)presentControllerInPopoverController:(UIViewController *)vc fromRect:(CGRect)rect inView:(UIView *)view permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections animated:(BOOL)animated;
{
  UIPopoverController *pc = [[UIPopoverController alloc] initWithContentViewController:vc];
  [self presentPopoverController:pc fromRect:rect inView:view permittedArrowDirections:arrowDirections animated:animated];
  [pc release];
}

- (void)presentControllerInPopoverController:(UIViewController *)vc fromBarButtonItem:(UIBarButtonItem *)item permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections animated:(BOOL)animated;
{
  UIPopoverController *pc = [[UIPopoverController alloc] initWithContentViewController:vc];
  [self presentPopoverController:pc fromBarButtonItem:item permittedArrowDirections:arrowDirections animated:animated];
  [pc release];
}

#pragma mark -
#pragma mark UIPopoverControllerDelegate methods

- (void)popoverControllerDidDismissPopover:(UIPopoverController *)popoverController
{
  [[NSNotificationCenter defaultCenter] postNotificationName:LRUIPopoverControllerDidDismissNotification object:popoverController];
}

- (BOOL)popoverControllerShouldDismissPopover:(UIPopoverController *)popoverController
{
  return self.permitCurrentPopoverControllerToDismiss;
}

@end

Awesome. I will definitely be using this.

Do let me know (by Twitter, or on here) if you run into any problems with it or have any improvements.