小编Jor*_*oon的帖子

我已使用IBOutlet将TableView正确连接到CollectionViewCell上，但是当我尝试使用此Tableview执行某些操作时，例如：cell.tableview.tag = x，它说：

意外找到nil，同时隐式展开Optional值。当我取消评论

import UIKit

class CollectionCell: UICollectionViewCell {
    // When I uncomment the next line, it works good
    //let tableView = UITableView()



    @IBOutlet var tableView: UITableView!
}

class ViewController: UIViewController {

    var testArray = [["Day0-0","Day0-1","Day0-2"], ["Day1-0","Day1-1","Day1-2"], ["Day2-0","Day2-1","Day2-2"],["Day3-0","Day3-1","Day3-2"],["Day4-0","Day4-1","Day4-2"]]

    @IBOutlet weak var collectionView: UICollectionView!
    // let collectionView = UICollectionView(frame: .zero, collectionViewLayout: UICollectionViewFlowLayout())
    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .white


        collectionView.delegate = self
        collectionView.dataSource = self
        collectionView.register(CollectionCell.self, forCellWithReuseIdentifier: "CollectionCell")
        view.addSubview(collectionView)
        view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[collectionView]|", options: [], metrics: nil, views: ["collectionView":collectionView])) …