MFMailComposeViewController 不显示取消按钮

Question

我尝试了所有 SOF 解决方案，但对我的情况都不起作用。

我的应用正在使用标签栏，其中一个标签栏正在设置（表格视图）。用户可以点击支持单元格来发送电子邮件。

我可以调出电子邮件视图，但它没有取消按钮。关闭它的唯一方法是发送电子邮件或向下滑动 save/delete 草稿。

谢谢！！

import UIKit
import MessageUI

class SettingVC: UIViewController, UITableViewDelegate, UITableViewDataSource, MFMailComposeViewControllerDelegate {
    @IBOutlet weak var tableView: UITableView!

    let mail = MFMailComposeViewController()
    var fromSetting: Bool = false
    let settingsSction = ["Section0", "Section1", "Section2"]
    let settingsCell = [["Cell0"],
                        ["Cell1"],
                        ["Cell2", "Support"]]

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        self.navigationController?.navigationBar.barStyle = .black
    }

    override var preferredStatusBarStyle: UIStatusBarStyle {
        return .lightContent
    }

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

        tableView.delegate = self
        tableView.dataSource = self
        mail.mailComposeDelegate = self
    }

    func setUpNavBar() {
        self.navigationItem.titleView?.tintColor = .white
        let settingsTitleLabel = UILabel()
        settingsTitleLabel.textColor = .white
        settingsTitleLabel.font = UIFont.boldSystemFont(ofSize: 18)
        settingsTitleLabel.text = "Settings"
        self.navigationItem.titleView = settingsTitleLabel
    }

    //MARK: Table View Sections
    func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return 50
    }

    func numberOfSections(in tableView: UITableView) -> Int {
        return settingsSction.count
    }

    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        return settingsSction[section]
    }

    //MARK: Table View Cell Title
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return settingsCell[section].count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
        cell.textLabel?.text = "\(settingsCell[indexPath.section][indexPath.row])"
        cell.selectionStyle = .none

        return cell
    }

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        switch indexPath.section {
        case 2:
            switch indexPath.row {
            case 1:
                sendEmail()
            default:
                break
            }
        default:
            break
        }
    }

    func sendEmail() {
        if MFMailComposeViewController.canSendMail() {
            mail.navigationBar.tintColor = UIColor.orange
            mail.setToRecipients(["support@example.com"])
            mail.setSubject("I have an issue.")

            self.present(mail, animated: true, completion: nil)
        } else {
           alertOK(title: "No Mail App Available", message: "Please install Mail app in your phone or use other mail app to send us the issue. Thank you.", sender: self)
        }
    }

    func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
        controller.dismiss(animated: true, completion: nil)
    }
}

Answer 1

问题已解决。我在 app delegate 中设置了导航栏颜色，所以它也使文本变成了白色。

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