How to get cell size of UICollectionView before rotating
I have a UICollectionView that has a width that is a percentage of the parent. When it is rotated I need to know what size it will be, so I can invalidate the layout and redraw the collection view cells as the new full width. I used the viewWillTransitionToSize: withTransitionCoordinator: method, but the size it returns is of the entire screen. Is there an easy way to get a new frame of the UICollectionView before the orientation change takes effect?
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override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
super.viewWillTransitionToSize(size, withTransitionCoordinator: coordinator)
print(self.collectionView.frame) // old frame
coordinator.animateAlongsideTransition({ (UIViewControllerTransitionCoordinatorContext) -> Void in
}) { (UIViewControllerTransitionCoordinatorContext) -> Void in
print(self.collectionView.frame) // new frame
}
}
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