无法将类型'NSObject'文件的值分配为类型'UIImage'-Apple Swift

Question

我正在尝试通过UIImagePicker将相册创建到CollectionView中，并且无法在详细的UIViewController中再次将其固定为上述照片。拔头发，这只是我刚刚开始编码的教程！

有人可以告诉我我在做什么错吗？

var testItems = [Person]()

@IBAction func addItem() {
    addNewPerson()
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "DetailSegue" {
        if let dest = segue.destination as? DetailsViewController,
            let index = sender as? IndexPath {
                dest.detailedImageHi = testItems[index.row]
            }
    }
}

NS对象文件如下：

class Person: NSObject {

    var imageHi: String

    init(imageHi: String){
        self.imageHi = imageHi
    }
}

DetailsViewController： 类DetailsViewController：UIViewController {

var selection: String!
var detailedImageHi: UIImage!


@IBOutlet private weak var detailsLabel: UILabel!
@IBOutlet private weak var detailedImage: UIImageView!

override func viewDidLoad() {
    super.viewDidLoad()

    detailsLabel.text = selection
    detailedImage.image = detailedImageHi
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

}

import UIKit

class CollectionViewCell: UICollectionViewCell {
    @IBOutlet weak var titleLabel: UILabel!
    @IBOutlet weak var selectionImage: UIImageView!
}