Programming iOS 11 by Matt Neuburg

Author:Matt Neuburg
Language: eng
Format: epub, pdf
Publisher: O'Reilly Media
Published: 2017-12-22T05:00:00+00:00

override var collectionViewContentSize : CGSize { return self.sz } override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? { return Array(self.atts.values) } override func layoutAttributesForItem(at indexPath: IndexPath) -> UICollectionViewLayoutAttributes? { return self.atts[indexPath] }

Finally, I want to implement shouldInvalidateLayout(forBoundsChange:) to return true, so that if the interface is rotated, my prepareLayout will be called again to recalculate the grid. There’s a potential source of inefficiency here, though: the user scrolling the collection view counts as a bounds change as well. Therefore, I return false unless the bounds width has changed:

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