ios - 创建子类并覆盖 loadView() 时 UITableViewController.tableView=nil

Question

我正在尝试子类化 UITableViewController 并通过重写 Controller 的 loadView() 方法执行自定义 View 设置。我这样做是因为我需要 TableView 顶部的 balanceView 和底部的 float 圆圈按钮。我做类似的事情，因为稍后我需要这个“基本” Controller 来用于不同的子类组，它们都必须具有这两个 View ，但它们将具有完全不同的 tableViews。一切都正确加载，但 viewDidLoad 和 viewDidAppear 中的 tableView 属性为零，但 tableViews 数据源和委托(delegate)方法调用成功!我做错了什么？ (也许我需要子类化 UIViewController ？)这是我的代码:

这是我的 UITableViewController 子类 loadView:

override func loadView() {
    super.loadView()

    let bView = UIView()

    balanceView = BalanceViewSwift()
    balanceView.translatesAutoresizingMaskIntoConstraints = false
    bView.addSubview(balanceView)

    tableView = UITableView(frame: .zero, style: .plain)
    tableView.translatesAutoresizingMaskIntoConstraints = false
    bView.addSubview(tableView)

    balanceView.addAnchorToSuperview(anchor: .top, margin: 0)
        .addAnchorToSuperview(anchor: .leading, margin: 0)
        .addAnchorToSuperview(anchor: .trailing, margin: 0).end()

    tableView.addAnchorToSuperview(anchor: .bottom, margin: 0)
        .addAnchorToSuperview(anchor: .leading, margin: 0)
        .addAnchorToSuperview(anchor: .trailing, margin: 0).end()

    balanceView.bottomAnchor.constraint(equalTo: tableView.topAnchor).isActive = true

    addButtonView = CircleButton()
    addButtonView.translatesAutoresizingMaskIntoConstraints = false
    addButtonView.backgroundColor = .red
    addButtonView.tintColor = .white
    addButtonView.setTitle("+", for: .normal)
    addButtonView.addTarget(self, action: #selector(BalanceTableViewController.addButtonTapped(_:)), for: .touchUpInside)

    bView.addSubview(addButtonView)

    addButtonView.addAnchorToSuperview(anchor: .bottom, margin: 16).addAnchorToSuperview(anchor: .trailing, margin: 16).end()
    addButtonView.heightAnchor.constraint(equalTo: addButtonView.widthAnchor).isActive = true
    addButtonView.widthAnchor.constraint(equalToConstant: 50).isActive = true

    tableView.delegate = self
    tableView.dataSource = self

    balanceView.addFundsButtonIsHidden = !balanceViewAddFundsButtonIsVisible
    addButtonView.isHidden = !circleBottomAddButtonIsVisible

    view = bView
}

Answer 1

您需要删除super.loadView()

You can override this method in order to create your views manually. If you choose to do so, assign the root view of your view hierarchy to the view property. The views you create should be unique instances and should not be shared with any other view controller object. Your custom implementation of this method should not call super. Apple doc