过渡方法与错误的UIView一起使用

Question

Example One Example 2 hierarchy 当我按下按钮时，无法使用所需的UIView进行转录。通常是下一个UIView。 我需要进行转换才能使用按钮上方的UIView。

我正在使用此框架https://cocoapods.org/pods/MSPeekCollectionViewDelegateImplementation

我做错了什么？

import UIKit
import MSPeekCollectionViewDelegateImplementation




class ViewController: UIViewController  {

    var frontalView : UIView?
    var dorsalView : UIView?

    var fromView : UIView?
    var toView : UIView?




    let dorsalText = ["Hello" , "Friend" , "Goodbye" , "Time"]
    let frontalText = ["Bilbo" , "Johny" , "Goodnight" , "to study"]

    var flippedCard = false


    @IBOutlet weak var cardsCollection: UICollectionView!
    let delegate = MSPeekCollectionViewDelegateImplementation()

    override func viewDidLoad() {
        super.viewDidLoad()

        cardsCollection.configureForPeekingDelegate()
        cardsCollection.delegate = delegate
        cardsCollection.dataSource = self

    }

    @IBAction func reverseButton(_ sender: Any) {

        if flippedCard == true {
            flippedCard = false
        } else {
            flippedCard = true
        }

        if flippedCard == true {
            fromView = frontalView
            toView = dorsalView
        } else {
            fromView = dorsalView
            toView = frontalView
        }

        UIView.transition(from: fromView!, to: toView!, duration: 0.5, options: [.transitionFlipFromRight , .showHideTransitionViews])


    }


}

extension ViewController: UICollectionViewDataSource {


    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 1
    }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 4
    }



    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath)
        let frontalViewCell = cell.viewWithTag(1) as! UIView
        let frontalLabel = cell.viewWithTag(2) as! UILabel
        let dorsalViewCell = cell.viewWithTag(3) as! UIView
        let dorsalLabel = cell.viewWithTag(4) as! UILabel
        frontalView = frontalViewCell
        dorsalView = dorsalViewCell
        frontalLabel.text = frontalText[indexPath.item]
        dorsalLabel.text = dorsalText[indexPath.item]
        cell.contentView.backgroundColor = UIColor.red

        return cell

    }



}

非常感谢您的帮助。