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POUICollectionView insertSections error - NSInvalidArgumentException reason setObjectForKey object cannot be nil UICollectionViewItemKey
 

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  1. POUICollectionView insertSections error - NSInvalidArgumentException reason setObjectForKey object cannot be nil UICollectionViewItemKey
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    <p>I'm getting an error using a UICollectionView as follows:</p> <pre><code>2013-11-29 17:29:07.832 Clients[34200:70b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** setObjectForKey: object cannot be nil (key: &lt;_UICollectionViewItemKey: 0x8da14f0&gt; Type = DV ReuseID = (null) IndexPath = (null))' </code></pre> <p>And the code is as follows, where I essentially have two NSMutableArrays -- one containing all entries and the other used to reduce the entries to one section -- in this bit, I'm adding all the missing sections back in (hope that makes sense).</p> <pre><code>[self.collectionView performBatchUpdates:^{ NSString *selectedMarketSector = [[[[_marketSectors objectAtIndex:0] clients] objectAtIndex:0] clientMarketSector]; NSMutableIndexSet *insertSections = [[NSMutableIndexSet alloc] init]; for (TBMarketSector* sector in _allMarketSectors) { if (![[[[sector clients] objectAtIndex:0] clientMarketSector ] isEqualToString:selectedMarketSector]) { [insertSections addIndex:[_allMarketSectors indexOfObject:sector]]; } } _marketSectors = [self.allMarketSectors mutableCopy]; [self.collectionView insertSections:insertSections]; } completion:^(BOOL finished) { [self setLayoutStyle:TBLayoutStacks animated:YES]; }]; </code></pre> <p>The line that 'appears' to be causing the problem is the <code>[self.collectionView insertSections:insertSections];</code> but I'm wondering if there is something weird going on elsewhere...</p> <p>Thanks for any assistance you can provide.</p>
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. USDarren
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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    1. This table or related slice is empty.
    1. COif(insertSections != nil) { [self.collectionView insertSections:insertSections]; }
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      1. POUICollectionView insertSections error - NSInvalidArgumentException reason setObjectForKey object cannot be nil UICollectionViewItemKey
      1. USSabareesh
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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