swift - 如何将 UIViewController 的 PreferredContentSize 设置为包含 UITableView contentSize 的高度？

Question

我调用如下所示的弹出窗口:

if let vc = CalendarDetailViewControllerContainer.storyboardInstance() {
    vc.preferredContentSize = CGSize(width: ((self.view.frame.width / 5) * 2), height: vc.view.frame.height);
    vc.modalPresentationStyle = UIModalPresentationStyle.popover;
    vc.popoverPresentationController?.delegate = self;
    vc.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection.any;
    vc.popoverPresentationController?.sourceView = sourceView;
    vc.popoverPresentationController?.sourceRect = CGRect(x: 0, y: 0, width: sourceView.frame.size.width, height: sourceView.frame.size.height);

    self.present(vc, animated: true, completion: nil);
}

正如您现在所看到的，我将 preferredContentSize 高度设置为 vc.view.frame.height。但这应该有所不同。现在，还有更多代码。在下面我的CalendarDetailViewControllerContainer中:

class CalendarDetailViewControllerContainer : UIViewController {

    @IBOutlet weak var containerView: UIView!;

    static func storyboardInstance() -> CalendarDetailViewControllerContainer? {
        let storyboard = UIStoryboard(name: String(describing: NSStringFromClass(CalendarDetailViewControllerContainer.classForCoder()).components(separatedBy: ".").last!), bundle: nil);

        return storyboard.instantiateInitialViewController() as? CalendarDetailViewControllerContainer;
    }

    override func viewDidLoad() {
        super.viewDidLoad();

        self.setupView();
        self.setupDetailView();
    }

    func setupView() {
        self.view.backgroundColor = UIColor.clear;
        self.view.isOpaque = false;
    }

    func setupDetailView() {
        if let vc = CalendarDetailViewController.storyboardInstance() {
            let navigationController = UINavigationController(rootViewController: vc);

            self.addChildViewController(navigationController);

            navigationController.view.frame = self.containerView.frame;

            self.containerView.addSubview(navigationController.view);

            navigationController.didMove(toParentViewController: self);
        }
    }
}

我需要这个容器，因为为了以后的目的和 future 的继续，我将需要导航 Controller (并且我不会在 Storyboard中构建它)。所以代码的最后一部分:

class CalendarDetailViewController : UITableViewController {

    static func storyboardInstance() -> CalendarDetailViewController? {
        let storyboard = UIStoryboard(name: String(describing: NSStringFromClass(CalendarDetailViewController.classForCoder()).components(separatedBy: ".").last!), bundle: nil);

        return storyboard.instantiateInitialViewController() as? CalendarDetailViewController;
    }

    override func viewDidLoad() {
        self.navigationController?.isNavigationBarHidden = true;

        self.tableView.rowHeight = UITableViewAutomaticDimension;
        self.tableView.estimatedRowHeight = 120.0;
    }

    override func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return CGFloat.leastNormalMagnitude;
    }

    override func tableView(_ tableView: UITableView, heightForFooterInSection section: Int) -> CGFloat {
        return CGFloat.leastNormalMagnitude;
    }

    override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return UITableViewAutomaticDimension;
    }
}

我现在尝试做的是将弹出窗口的 preferredContentSize 高度设置为与 TableView 的 contentSize 完全相同。

我怎样才能做到这一点？

Answer 1

您可以覆盖 CalendarDetailViewControllerContainer 的 PreferredContentSize，但请确保在计算大小之前重新加载表格并调用 layoutIfNeeded()。

public override var preferredContentSize: CGSize {
    get {
        return CGSize(width: tableView.contentSize.width,
                      height: tableView.contentSize.height + tableView.layoutMargins.top + tableView.layoutMargins.bottom)
    }

    set { super.preferredContentSize = newValue }
}