如何在同一个视图控制器中将数据从一个集合视图传递到第二个集合视图

我有两个CollectionView在.ViewController，如何更改CollectionView_2_items项数据时，立即选择CollectionView_1_types牢房？

我的结构是：

struct MyObj {
    var type: String
    var items:[String]
}

let a = Myobj(type: "food", items:["apple", "ham", "egg"])
let b = Myobj(type: "color", items:["white", "black", "yellow"])
var Allobj:[Myobj] = [a, b]```  
我想展示并更改Myobj.项目CollectionView_2_item当我改变Myobj.type在……里面CollectionView_1_types.

以下是我在ViewController中的代码：

class MainControllerView: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {

@IBOutlet weak var TypeCollectionView: UICollectionView!
@IBOutlet weak var itemCollectionView: UICollectionView!

struct MyObj {
    var item: String = ""
    var Allitems: [String] = []
}

var Allobj:[Myobj] = []
var ary:[String] = []

override func viewDidLoad() {
    super.viewDidLoad()

    self.TypeCollectionView.delegate = self
    self.TypeCollectionView.dataSource = self
    self.itemCollectionView.delegate = self
    self.itemCollectionView.dataSource = self

    let a = MyItem(item: "food", Allitems: ["apple", "ham", "egg"])
    let b = MyItem(item: "color", Allitems: ["white", "black", "yellow"])
    Allobj = [a, b]
}

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    if collectionView == TypeCollectionView {
        return Allobj.count
    }else if collectionView == itemCollectionView {
        return ary.count
    }
    return 0
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "", for: indexPath) as UICollectionViewCell

    if collectionView == TypeCollectionView {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! TypeCollectionCell
        let d = Allobj[indexPath.row]
        cell.typeLabel.text = d.item
        return cell
    }else if collectionView == itemCollectionView {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! itemsCollectionCell
        let d = ary[indexPath.row]
        cell.itemLabel.text = d
        return cell
    }
    return cell
}

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    let d  = Allobj[indexPath.row]
    if collectionView == TypeCollectionView {
        ary = d.Allitems
    }
}

}