Change UICollectionViewCell size on different device orientations

Question

I am using an UICollectionView with UICollectionViewFlowLayout.

I set the size of each cell through the

collectionView:lay         


        

Answer 1

Swift : Collection View Cell that is n% of screen height

I needed was a cell that was a certain percentage of views height, and would resize with device rotation.

With help from above, here is the solution

override func viewDidLoad() {
    super.viewDidLoad()
    automaticallyAdjustsScrollViewInsets = false
    // if inside nav controller set to true
}

override func willRotateToInterfaceOrientation(toInterfaceOrientation: UIInterfaceOrientation, duration: NSTimeInterval) {
    collectionViewLayout.invalidateLayout()
}

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
    return CGSize(width: 100, height: collectionView.frame.height * 0.9)
}