Dynamic CollectionViewCell size using AutoLayout not rendering properly - ios

Question

I currently have my UICollectionView set up in the IB like so:
The bottom constraint has it's constant changed to the height of the keyboard when the keyboard appears:
func keyboardWillShow(notification: NSNotification) {
let keyboardHeight = getKeyboardHeight(notification)
keyboardHeightConstraint.constant = keyboardHeight + 20
print(cardCollectionView.frame)
self.cardCollectionView.configureCollectionView()
self.cardCollectionView.reloadInputViews()
}
Where configureCollectionView() is:
func configureCollectionView() {
self.backgroundColor = UIColor.clearColor()
// Create the layout
let space = 10.0 as CGFloat
let flowLayout = UICollectionViewFlowLayout()
let width = (self.frame.size.width) - 4 * space
let height = (self.frame.size.height)
let edgeInsets = UIEdgeInsetsMake(0, 2 * space, 0, 2 * space)
// Set top and bottom margins if scrolling horizontally, left and right margins if scrolling vertically
flowLayout.minimumLineSpacing = space
flowLayout.minimumInteritemSpacing = 0
// Set horizontal scrolling
flowLayout.scrollDirection = .Horizontal
// Set edge insets
flowLayout.sectionInset = edgeInsets
flowLayout.itemSize = CGSizeMake(width, height)
self.setCollectionViewLayout(flowLayout, animated: true)
// Always allow it to scroll
self.alwaysBounceHorizontal = true
}
Now the problem arises when the keyboard appears:
When the keyboard first appears the CollectionView gets resized and then configureCollectionView() is called. As a result the CollectionViewCell should also get resized but instead it looks like it's being clipped by the bounds of the resized CollectionView.
This can be seen as in the 2nd image in the GIF (after the keyboard appears) there are no rounded corners on the bottom and the 4 buttons are there.
It seems like when I click another TextView the CollectionViewCell goes back to it's correct size, although it still has an alpha = 1 even though nowhere in my code did I set the alpha to one.
To get my final desired result, I had to dismiss the keyboard.
What is wrong with my implementation, what can I do different to achieve my desired result when the keyboard is shown instead of having to go through all of the above?