Duplicate popover problem (likely a fundamentals issue)

[MikeP]

This is my first app since slogging through the Learning Objective C 2.0 and Beginning iPhone 3 books, so please bear with me.  The response I got on another forum (http://www.iphonedevsdk.com/forum/iphone-sdk-development/52850-cant-seem-stop-duplicate-popovers.html) wasn't helpful at all.  Even if he pointed me to the relevant section of his "definitive guide" that helped explain where I failed and why, that would have helped.

I've got this one user experience bug I just can't seem to shake. You tap a toolbar button and a popover displays. That's good. Tap the toolbar button again and I get a 2nd popover right on top of the first. Not good.

Code: (Objective-C)

		FlickrPhotoPickerController *flickrPhotoPickerView = [[FlickrPhotoPickerController alloc] init];
		UIPopoverController *photoPopover = [[UIPopoverController alloc] initWithContentViewController:flickrPhotoPickerView];
		[photoPopover setDelegate:self];
		[flickrPhotoPickerView setPopover:photoPopover];
		[flickrPhotoPickerView setMainImage:PPimageView];
		if ([photoPopover isPopoverVisible]) {
			NSLog(@"Yep, visible!");
			[photoPopover dismissPopoverAnimated:YES];
		} else {
			NSLog(@"Nope, not visible!");
			[photoPopover presentPopoverFromBarButtonItem:sender permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
		}

	
		[flickrPhotoPickerView release];

The thing is, the if keeps evaluating to false, even if the button is pressed a second time.

If I do this:

Code: (Objective-C)

		if ([photoPopover isPopoverVisible]) {
			NSLog(@"Yep, visible!");
			[photoPopover dismissPopoverAnimated:YES];
		}
		FlickrPhotoPickerController *flickrPhotoPickerView = [[FlickrPhotoPickerController alloc] init];
		UIPopoverController *photoPopover = [[UIPopoverController alloc] initWithContentViewController:flickrPhotoPickerView];
		[photoPopover setDelegate:self];
		[flickrPhotoPickerView setPopover:photoPopover];
		[flickrPhotoPickerView setMainImage:PPimageView];
 
			NSLog(@"Nope, not visible!");
			[photoPopover presentPopoverFromBarButtonItem:sender permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

	
		[flickrPhotoPickerView release];

I get "'photoPopover' undeclared (first use in this function)"

My sense is it's a scope issue for the popover controller, but I'm not sure how to handle the init properly for my needs.  (basically, I understand that I may be failing to understand a basic fundamental concept)

Now, his response was:

Use a property for the popover. Then dismiss the old popover before you create a new one.

I considered that, but I wasn't getting anywhere there either. Using @property and @synthesize, and changing my code to:

Code: (Objective-C)

		if ([photoPopover isPopoverVisible]) {
			NSLog(@"Yep, visible!");
			[photoPopover dismissPopoverAnimated:YES];
		}
		FlickrPhotoPickerController *flickrPhotoPickerView = [[FlickrPhotoPickerController alloc] init];
		[photoPopover initWithContentViewController:flickrPhotoPickerView];
		[photoPopover setDelegate:self];
		[flickrPhotoPickerView setPopover:photoPopover];
		[flickrPhotoPickerView setMainImage:PPimageView];
 
			NSLog(@"Nope, not visible!");
			[photoPopover presentPopoverFromBarButtonItem:sender permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

	
		[flickrPhotoPickerView release];

No popover would even appear. If I don't use @synthesize, wouldn't I still have to alloc right there where I was before? Wouldn't that leave me back at square one?  Should I be overloading the setter?