ios – 在iPad的Swift Playgrounds中显示TableView

一切正常,除了最后一行,我试图在实时视图中显示tableView不起作用：PlaygroundPage.current.liveView = controller

我无法弄清楚我错了什么？

import UIKit
import PlaygroundSupport
import Foundation

class TableViewController: UITableViewController {
    let tableData = ["Matthew","Mark","Luke","John"]

override func viewDidLoad() {
    super.viewDidLoad()
    print("Hello Matt")
}

override func numberOfSections(in tableView: UITableView) -> Int {
    return 1
}

override func tableView(_ tableView: UITableView,numberOfRowsInSection section: int) -> Int {
    return tableData.count
}

override func tableView(_ tableView: UITableView,cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    var cell = tableView.dequeueReusableCell(withIdentifier: "cell",for: indexPath) as UITableViewCell
    cell.textLabel?.text = tableData[indexPath.row]
    return cell
}
}

let controller = TableViewController()
PlaygroundPage.current.liveView = controller

override func viewDidLoad() {
    super.viewDidLoad()
    tableView.register(UITableViewCell.self,forCellReusEIDentifier: "cell")
}