Combine views between forms and native

Hello,

I have one absolute layout with a button, slider and one image as a background.

When I load the page I render it in each platform and add a UICollectionView in ios.

The problem is that the UICollectionView is always at front and I cannot see the button and the slider. If bring UICollectionView to back is goes behind the image.

How can combine the views between forms and native?

Thanks.