帶頂欄的 3D Touch Peek

Question

我有一個UICollectionView ，它在3D Touch ed 時顯示“Peek”。 作為默認行為，“Peek”忽略導航欄。

但是，我確實想像在iMessage Peek中一樣顯示一個欄，如下所示：

Collection View Controller 和 Peek View Controller 都在 Navigation View Controller 中。

我在下面的 Apple 示例代碼中有以下片段，我正在嘗試將其修改為上述需求：

extension ChatTableViewController: UIViewControllerPreviewingDelegate {
    func previewingContext(_ previewingContext: UIViewControllerPreviewing, viewControllerForLocation location: CGPoint) -> UIViewController? {
        guard let indexPath = tableView.indexPathForRow(at: location) else { return nil }

        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let viewController = storyboard.instantiateViewController(withIdentifier: ChatDetailViewController.identifier)
        guard let chatDetailViewController = viewController as? ChatDetailViewController else { return nil }

        chatDetailViewController.chatItem = chatItem(at: indexPath)
        let cellRect = tableView.rectForRow(at: indexPath)
        previewingContext.sourceRect = previewingContext.sourceView.convert(cellRect, from: tableView)
        chatDetailViewController.isReplyButtonHidden = true

        return chatDetailViewController
    }

    func previewingContext(_ previewingContext: UIViewControllerPreviewing, commit viewControllerToCommit: UIViewController) {
        if let chatDetailViewController = viewControllerToCommit as? ChatDetailViewController {
            chatDetailViewController.isReplyButtonHidden = false
        }
        show(viewControllerToCommit, sender: self)
    }

---

更新

感謝Leo Natan，我能夠完成上述任務：

extension ChatTableViewController: UIViewControllerPreviewingDelegate {
    func previewingContext(_ previewingContext: UIViewControllerPreviewing, viewControllerForLocation location: CGPoint) -> UIViewController? {
        guard let indexPath = tableView.indexPathForRow(at: location) else { return nil }

        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let viewController = storyboard.instantiateViewController(withIdentifier: ChatDetailViewController.identifier)
        guard let chatDetailViewController = viewController as? ChatDetailViewController else { return nil }

        chatDetailViewController.chatItem = chatItem(at: indexPath)
        let cellRect = tableView.rectForRow(at: indexPath)
        previewingContext.sourceRect = previewingContext.sourceView.convert(cellRect, from: tableView)
        chatDetailViewController.isReplyButtonHidden = true

        let navigationController = UINavigationController(rootViewController: viewController
        return navigationController
    }

    func previewingContext(_ previewingContext: UIViewControllerPreviewing, commit viewControllerToCommit: UIViewController) {
        if let chatDetailViewController = viewControllerToCommit as? ChatDetailViewController {
            chatDetailViewController.isReplyButtonHidden = false
        }
        show(viewControllerToCommit, sender: self)
    }

但是，這會創建一個新的導航控制器。 如果我想以相同的導航控制器結束，我可以這樣做：

func previewingContext(_ previewingContext: UIViewControllerPreviewing, commit viewControllerToCommit: UIViewController) {
    if let chatDetailViewController = viewControllerToCommit as? ChatDetailViewController {
        chatDetailViewController.isReplyButtonHidden = false
    }

    show((viewControllerToCommit as UIController).viewControllers[0], sender: self)
}

show((viewControllerToCommit as UIController).viewControllers[0], sender: self)從它的導航控制器中提取視圖控制器。 這有什么缺點嗎？

Answer 1

在previewingContext(_:, viewControllerForLocation:) ，將您的視圖控制器包裝在UINavigationController並返回。