Add Facebook Shimmer on multiple UIViews

I am trying to add Facebook Shimmer on UICollectionViewCell which has multiple UIViews.

For one UIView, it's working fine with below code:

let shimmeringView = FBShimmeringView(frame: imageView.frame)
shimmeringView.contentView = imageView
backgroundView.addSubview(shimmeringView)
shimmeringView.isShimmering = true

Where backgroundView is the view in which I have all the subviews such as imageView, labelView and others.

While I am trying to add multiple views then first view is getting correct frame but other views' widths are becoming zero. I'm adding this code inside collectionView(_:cellForItemAt:).

let shimmeringView = FBShimmeringView(frame: imageView.frame)
shimmeringView.contentView = imageView
backgroundView.addSubview(shimmeringView)
shimmeringView.isShimmering = true

let shimmeringView = FBShimmeringView(frame: labelView.frame)
shimmeringView.contentView = labelView
backgroundView.addSubview(shimmeringView)
shimmeringView.isShimmering = true

Can anyone tell me if it's the correct way to implement Facebook Shimmer for multiple UIViews or Where I am doing it wrong?

I believe there are many ways to implement FBShimmeringView, it's a matter of preferences. So in my case, I prefer the easiest way (according to me).

What I do in my tableViewCell that has of course multiple views such as imageView and labels, just like yours, is that I have multiple UIView gray color, placed on top of each views in my cell.

Then I only have ONE instance of FBShimmeringView added to my cell.

Here are some more details about what I practice for using FBShimmeringView.

*Take note that I use SnapKit to layout my views programmatically.

I have a property in my cell called isLoading like so, which determines if the gray colored views should be shown or now. If shown, of course turn on shimmering:

public var serviceIsLoading: Bool = false {
    didSet {
        _ = self.view_Placeholders.map { $0.isHidden = !self.serviceIsLoading }
        self.view_Shimmering.isHidden = !self.serviceIsLoading
        self.view_Shimmering.isShimmering = self.serviceIsLoading
    }
}

Then I add a white view to my cell after adding all the subviews to the cell:

// Place the FBShimmeringView
// Try to add a dummy view
let dummyView = UIView()
dummyView.backgroundColor = .white
self.addSubview(dummyView)
dummyView.snp.makeConstraints { (make) in
    make.edges.equalToSuperview()
}

Add the ShimerringView to the cell as well:

self.addSubview(self.view_Shimmering)
self.view_Shimmering.snp.makeConstraints { (make) in
    make.height.width.equalToSuperview()
    make.center.equalToSuperview()
}