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    <p>As the documentation says, you can rely on <code>highlighted</code> property to be changed while the cell is highlighted. For example the following code will make the cell red when highlighted (not its subviews though):</p> <pre><code>- (void)setHighlighted:(BOOL)highlighted { [super setHighlighted:highlighted]; [self setNeedsDisplay]; } - (void)drawRect:(CGRect)rect { [super drawRect:rect]; if (self.highlighted) { CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetRGBFillColor(context, 1, 0, 0, 1); CGContextFillRect(context, self.bounds); } } </code></pre> <p>And if you <strong>add</strong> something like this the background will become purple (red + opaque blue):</p> <pre><code>- (void)collectionView:(UICollectionView *)colView didHighlightItemAtIndexPath:(NSIndexPath *)indexPath { UICollectionViewCell *cell = [colView cellForItemAtIndexPath:indexPath]; cell.contentView.backgroundColor = [UIColor colorWithRed:0 green:0 blue:1 alpha:0.5]; } - (void)collectionView:(UICollectionView *)colView didUnhighlightItemAtIndexPath:(NSIndexPath *)indexPath { UICollectionViewCell *cell = [colView cellForItemAtIndexPath:indexPath]; cell.contentView.backgroundColor = nil; } </code></pre> <p>So you can use both together (not necessarily both changing the cell appearance). The difference is that with delegate methods you also have <code>indexPath</code>. It might be used to create multi-selection (you will use this methods together with selection delegate methods), to show some preview while the cell is highlighted, to show some animation with other views... There's quite a few appliance for this delegate methods in my opinion.</p> <p>As a conclusion, I would leave the cell appearance to be handled by the cell itself and use delegate methods to let controller make something cool in the same time.</p>
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    1. CO+1 Thanks. I like the `setNeedsDisplay` + `drawRect` approach. Maybe I would check if `self.highlighted != highlighted` (on line 1) before calling `setNeedsDisplay`, to avoid unnecessary drawing.
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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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