Databases
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    <p>First, drag and drop a UICollectionView to your ViewController in XIB, hook up Delegate, datasource to ViewController(this is only main ViewController)</p> <p>Don't use 2 different nib cell for 1 CollectionView, because you can only register 1 Nib. Better use DecorationView as HeaderView. Create new class HeaderView : UICollectionReusableView. This UICollectionReusableView is subclass of UIView can reuse inside UICollectionView together with UICollectionViewCell. Now you can register both type:</p> <pre><code>[self.collectionView registerNib:[UINib nibWithNibName:@"MyCell" bundle:nil] forCellWithReuseIdentifier:@"CELL"]; [self.collectionView registerNib:[UINib nibWithNibName:@"HeaderView" bundle:nil] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"HeaderCell"]; </code></pre> <p>Next, you drag another UICollectionView to this HeaderView, hook up with IBOutlet inside HeaderView.h. Here, it's better to set Delegate, DataSource to this class for control. Also register what Nib Cell this CollectionView will use. Do it in awakeFromNib because you registerNib before</p> <pre><code>- (void)awakeFromNib{ [self.topCollectionView registerNib:[UINib nibWithNibName:@"TopCell" bundle:nil] forCellWithReuseIdentifier:@"TopCell"]; [self.topCollectionView setDataSource:self]; [self.topCollectionView setDelegate:self]; } </code></pre> <p>It's will work well, if you store your datasource outside, just make another property and assign to it, then use for return inside datasource here.</p> <p>If you want to know when click on Cell inside headerView, Use a customDelegate protocol to send delegate to ViewController when click on HeaderCell. </p> <p>This is my code, hope you understand and can apply your data here:</p> <p><a href="https://github.com/lequysang/gitfiles02/blob/master/CollectionViewWithDecorationView.zip" rel="nofollow">https://github.com/lequysang/gitfiles02/blob/master/CollectionViewWithDecorationView.zip</a></p>
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    1. POBad Access on [UICollectionView setCollectionViewLayout:animated:]
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    1. COAt this moment the HeaderView is not only a view anymore it's acting like a ViewController. It's not good to create a design like that. The ViewController is managing the data between the model and the view. This is not valid for MVC. Your approach is more like a MVCC and that's not best way to to this.
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    2. COIt's a DecorationView,header is part of UICollectonView, now a ViewController.Only 1ViewController in my code. Have you check it? @mariusLAN
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    3. COYeah i checked the code but the HeaderView is not acting as a View only. It's more acting like a Controller. It's not MVC conform.
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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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