LoadingShimmer does not cover IB interface views

[whoyawn]

Actual Behaviour

There is no shimmer

Expected Behaviour

Shimmer should occur

Steps to reproduce it

1. Create a view controller in storyboard
2. Create views and outlets to the views.
3. Set the background of the view to a different color and the created subviews to a different color.
4. Connect the outlets.

Would you like to work on the issue?
No thank you.

import UIKit
import LoadingShimmer

class BugTest2ViewController: UIViewController {

    @IBOutlet var blackview: UIView!
    @IBOutlet var greenview: UIView!
    override func viewDidLoad() {
        super.viewDidLoad()
        LoadingShimmer.startCovering(blackview)
        LoadingShimmer.startCovering(greenview)
        // Do any additional setup after loading the view.
    }
}