您可以将CNContactViewController子类化，以便将done按钮添加到navigationItem。
大概是这样的

import ContactsUI

class ContactDetailsViewController: CNContactViewController {
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

        updateNavigationItem()
    }

    override func setEditing(_ editing: Bool, animated: Bool) {
        super.setEditing(editing, animated: animated)

        updateNavigationItem()
    }

    private func updateNavigationItem() {
        if !isEditing {
            // add a 0.5 seconds delay to add button after the editing animation finishes
            DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
                self.navigationItem.leftBarButtonItem = .init(
                    barButtonSystemItem: .done,
                    target: self,
                    action: #selector(self.doneTapped)
                )
            }
        }
    }

    @objc private func doneTapped() {
        dismiss(animated: true)
    }
}

为了使用此类，请确保ContactDetailsViewController嵌入在UINavigationController中。
虽然我这么晚才回答，但我希望这对你或其他人有帮助。