CustomCollectionViewLayout | Custom layout for a collection view using horizontal | iOS library

I have a custom layout for a collectionView. This custom layout increases the width of the center cell. Here is the custom layout class that does this. Look at the shiftedAttributes function to see how its done

I am trying to setup a custom collectionView layout and feel like I may be missing a step.

I created the collectionView, defined constraints, changed the layout from flow to custom and picked my custom class.

Now its not working and nothing is showing up so I am trying to debug the class method but I can't get any print statements to work because no function seems to be called. What step am I missing in setting this up? Here is the class:

I'm trying to create a custom UICollectionViewFlowLayout where items can be displayed either vertically or horizontally (see below)

Vertical:

|S|S|S|
|1|4|7|
|2|5|8|
|3|6|9|

Horizontal:

|S|1|2|3|
|S|4|5|6|
|S|7|8|9|

However, I cannot seem to get the vertical layout to work properly. The horizontal layout works just fine but every time I want to use the vertical layout it just crashes with the following error:

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UICollectionView received layout attributes for a cell with an index path that does not exist: {length = 2, path = 1 - 6}'

When I use the same data and force it to use the horizontal layout it works just fine which leads me to believe I'm doing something wrong with the layout attributes.

My custom flow layout class:

I created a custom collectionViewLayout which scales the cells proportionally to the devices screen size. All the images which are contained in the cells all appear to be stretched. Ive tried playing around with the aspectFit and aspectFill but they just distort the photos further.

Below is the CollectionView Layout Code:

Please, tell me the best way to "zoom in/out" UICollectionView and change size of UICollectionViewCell. I'm using a UIPinchGestureRecognizer now: When UICollectionView is "zoom in" and "zoom out", there are serious delays and freezing.

How can I get rid of friezes when I perform a PinchGestureRecognizer?

Here is implementation code of UIPinchGestureRecognizer in UICollectionViewController:

Here I have output with code

CustomCollectionViewController

Apples api shows that: collectionView.collectionViewLayout is a UICollectionViewLayout type and it inheritance from NSObject . if i code this it could work well