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copied!<p>Heres my 2 cents - because your item sizes are static why don't you set the item size on the <code>collectionViewLayout</code>?</p> <p>It will be quicker to do this rather than expecting the collection view to call its delegate method for every cell.</p> <p><code>viewWillLayoutSubviews</code> can be used for detection of rotation on view controllers. <code>invalidateLayout</code> can be used on a collection view layout to force it to prepare the layout again causing it to position the elements with the new sizes in this case.</p> <pre><code>- (void)viewWillLayoutSubviews; { [super viewWillLayoutSubviews]; UICollectionViewFlowLayout *flowLayout = (id)self.firstCollectionView.collectionViewLayout; if (UIInterfaceOrientationIsLandscape(UIApplication.sharedApplication.statusBarOrientation)) { flowLayout.itemSize = CGSizeMake(170.f, 170.f); } else { flowLayout.itemSize = CGSizeMake(192.f, 192.f); } [flowLayout invalidateLayout]; //force the elements to get laid out again with the new size } </code></pre> <p><strong>edit: updated with Swift2.0 example</strong></p> <pre><code>override func viewWillLayoutSubviews() { super.viewWillLayoutSubviews() guard let flowLayout = collectionView.collectionViewLayout as? UICollectionViewFlowLayout else { return } if UIInterfaceOrientationIsLandscape(UIApplication.sharedApplication().statusBarOrientation) { flowLayout.itemSize = CGSize(width: 170, height: 170) } else { flowLayout.itemSize = CGSize(width: 192, height: 192) } flowLayout.invalidateLayout() } </code></pre>

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