Pushing A View Controller Crashes The App

Question

Here's the scenario: I am using MWPhotoBrowser. I can push it fine once. The second time I try to push it the app crashes with nothing helpful. This is an ARC project, and this exact same code works fine in previous versions of the app. I am dumbfounded.

-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    selectedIndexPath = indexPath;
    if(browser == nil)
    {
        browser = [[MWPhotoBrowser alloc] initWithDelegate:self];
    }

    // Set options
    browser.displayActionButton = YES; // Show action button to allow sharing, copying, etc (defaults to YES)
    browser.displayNavArrows = YES; // Whether to display left and right nav arrows on toolbar (defaults to NO)
    browser.zoomPhotosToFill = NO; // Images that almost fill the screen will be initially zoomed to fill (defaults to YES)
    [browser setCurrentPhotoIndex:indexPath.row]; // Example: allows second image to be presented first
    //browser.wantsFullScreenLayout = YES; // iOS 5 & 6 only: Decide if you want the photo browser full screen, i.e. whether the status bar is affected (defaults to YES)
    // Present
    [self.navigationController pushViewController:browser animated:YES];
}

Tap a cell once, MWPhotoBrowser opens fine. Go back, tap a cell again, the app crashes just with the debugger but no call stack or error reason:

(lldb):

browser is a strong member variable. It isn't being deallocated prematurely. I can also guarantee it is crashing exactly on the last line of the method.

Can someone please enlighten me on this? I'd solve it if the app at least gave me a reason for the crash and not just throw the debugger on my face.

Answer 1

I have used MWPhotoBrowser extensively and ran across the same problem once. The way I solved it was by checking the MWPhoto objects to see if they actually had been set properly. I realised that I had not created some of them, hence the crash. I would check the place where you store your MWPhotos and make sure they are all set. Hope this helps!