在 MFMailComposeViewController 中设置导航栏项目颜色

Question

当我使用 swift 3 在 iOS 10 中导航到 MFMailComposeViewController 时，我目前在尝试设置取消和发送按钮颜色时遇到了一些困难。我尝试设置 MFMailComposeViewController 的 UINavigationController、Bar 和 Items 的色调，但没有成功。任何帮助将非常感激。

我如何打开 MFMailComposeViewController：

/* Open mail for the user to send a help emaail with questions about the app */
    func sendEmail() {

        if MFMailComposeViewController.canSendMail() {

            let mail = MFMailComposeViewController()
            mail.mailComposeDelegate = self
            mail.setToRecipients(["himom@gmail.com"])
            mail.navigationBar.tintColor = UIColor.blue

            present(mail, animated: true)

        }
    }

    /* Called when mail is dismissed */
    func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
        controller.dismiss(animated: true)
    }

Answer 1

如果您想要整个应用程序的导航颜色，即按钮的色调在整个应用程序中匹配，您可以尝试以下操作：

里面func application(_ application: UIApplication, didFinishLaunchingWithOptions的AppDelegate

// Custom color for navigation bar
UINavigationBar.appearance().tintColor = UIColor.whateverTintColorYouWant
UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName : UIColor.whateverTextColorYouWant]

如果您只想为 MailViewController 尝试此操作：

// Custom color for navigation bar
mail.navigationController?.navigationBar.tintColor = UIColor.aColorYouwant
mail.navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName : UIColor.aColorYouWant]