Could not cast value of type ‘UICollectionViewCell’

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The template for a CollectionViewController in Xcode comes with this line of code in viewDidLoad, which changes the specification in your storyboard.

// Register cell classes
self.collectionView!.register(UICollectionViewCell.self, forCellWithReuseIdentifier: reuseIdentifier)

Simply delete that line.

In older Swift versions the line is:

// Register cell classes
self.collectionView!.registerClass(UICollectionViewCell.self, forCellWithReuseIdentifier: reuseIdentifier)

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