Refactoring Swift UIViewPropertyAnimators out of massive view controller

Question

I am trying to refactor my Swift massive view controller which now has >900 lines (too many).

How can I separate the creation of my UIViewPropertyAnimators (~100 lines) from my main UIViewController? The thing is that the UIViewPropertyAnimators need reference to the view property and the UIViews they are animating. Do I create a struct with a weak var to which I assign the view reference by dependency injection? I would also need to refer to the UIView objects somehow. Not sure what is the best way to refactor this without creating a kind of circularity. Any ideas?

Addition:

As all animators only related to part of the window I have now created a child view controller and moved the animators there. I think this is also a viable solution. I had to add delegate pattern. At the end, the parent view controller is ~100 lines shorter and I have 'separated concern' as they say.

Answer 1

For example:

New File named PropertyAnimators

In that file import all the libraries that you need. Then extend the original view controller like so:

extension UIViewControllerName: UIViewController, (any other delegates that you need) {
//PropertyAnimators code
}