SwiftUI comes with wrong height when using UIHostingController inside UICollectionViewCell

I am trying to display a list of SwiftUI using UICollectionView, what I did is:

• using UICollectionViewCell to host the UIHostingController

• when the cell willDisplay, I added the UIHostingController to parent view controller

• remove it from parent controller when cell didEndDisplay

I notice sometimes, swiftUI only shows half or less half height of cell's height, when I scroll a cell outside screen back to screen, it made me feel the swiftUI is not rendered proper when it's outside screen.

code to host the UIHostingController:

Code Block 
class MyCell: UICollectionViewCell {
    private lazy var widgetHostingVC: UIHostingController<AnyView> = {
        let vc = UIHostingController(rootView: AnyView(Text("")))
        return vc
    }()
    /* BTW, widgetHostingVC's view is added to contentView during init, with constraints edge to edge */
}

code to pass SwiftUIView to cell, called when cellForItemAt:indexPath::

Code Block 
func config(_ swiftUIView: AnyView) {
    self.widgetHostingVC.rootView = swiftUIView
}

code to add widgetHostingVC to parentVC, called when cell willDisplay:

Code Block 
func addViewControllerToParentVC(_ parentVC: UIViewController) {
    parentVC.addChild(self.widgetHostingVC)
    self.widgetHostingVC.didMove(toParent: parentVC)
    self.contentView.addSubview(self.widgetHostingVC.view)
    // setup constraints
}

code to remove widgetHostingVC from parentVC, call when cell didEndDisplaying:

Code Block 
func removeViewControllerFromParentVC() {
    self.widgetHostingVC.removeFromParent()
}

Anyone know what is the problem cause the swiftUI not render with correct height?