1.首先在B中声明一个闭包，然后把闭包声明成属性：
import UIKit
typealias collectionViewblcok = (String) ->()
class CollectionViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {}
2.在B中，选中部分为按钮点击事件：
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
clickCollectionView!("点击collectionView")
}
3.在A中，写法为选中部分：
//weak var weakSelf = self
let collectionVC = CollectionViewController()
collectionVC.clickCollectionView = {(param) ->()in
}
self.navigationController?.pushViewController(collectionVC, animated: true)
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