Swift 2：第二次尝试 Table 视图后电子邮件取消按钮停止工作

Question

我正在使用 table 视图，其中有一个单元格显示 "Send Us Feedback." 它会打开包含要发送的预设信息的电子邮件应用程序。我可以发送电子邮件 and/or 取消它，但是当我第一次取消它时，停留在 table 视图，再次点击单元格打开电子邮件，我无法再次取消它。它只是停留在电子邮件视图中。

建议？

我的代码如下：

import UIKit
import MessageUI

class FeedbackViewController: UITableViewController, MFMailComposeViewControllerDelegate {

    let mailComposerVC = MFMailComposeViewController()

    override func viewDidLoad() {
        super.viewDidLoad()

        // Uncomment the following line to preserve selection between presentations
        // self.clearsSelectionOnViewWillAppear = false

        // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
        // self.navigationItem.rightBarButtonItem = self.editButtonItem()
    }

    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

        if indexPath.section == 0 && indexPath.row == 0
        {
            let alertController = UIAlertController(title: "Rate Us", message: "\nAre you enjoying our app? Please rate us in the app store!\n\nElse if you know of ways we can make our app better, please send us feedback so we can improve the experience for you!\n\nThank you!\n\nTimmy Caish", preferredStyle: .Alert)

            alertController.addAction(UIAlertAction(title: "Rate on iTunes", style: .Default, handler: {
                (action: UIAlertAction!) -> Void in
                UIApplication.sharedApplication().openURL((NSURL(string: "http://google.com")!))
                print("Rate us alert button worked.")
                print("Send to iTunes")
            }))

            alertController.addAction(UIAlertAction(title: "Send Us Feedback", style: .Default, handler: {
                (action: UIAlertAction!) in
                print("Rate Us feeback button worked.")
                let mailComposeViewController = self.configureMailComposeViewController()
                if MFMailComposeViewController.canSendMail()
                {
                    self.presentViewController(mailComposeViewController, animated: true, completion: nil)
                }
                else
                {
                    self.showSendMailErrorAlert()
                }
            }))

            alertController.addAction(UIAlertAction(title: "Cancel", style: .Default, handler: { (action: UIAlertAction) in
                print("Rate us cancel button worked.")
            print("Rate us")
            }))

            presentViewController(alertController, animated: true, completion: nil)
        }


        if indexPath.section == 0 && indexPath.row == 1
        {
            let mailComposeViewController = configureMailComposeViewController()

            if MFMailComposeViewController.canSendMail()
            {
                self.presentViewController(mailComposeViewController, animated: true, completion: nil)
            }
            else
            {
                self.showSendMailErrorAlert()
            }

            print("Send us feedback")
        }

    }

    func configureMailComposeViewController() -> MFMailComposeViewController {

        mailComposerVC.mailComposeDelegate = self

        mailComposerVC.setToRecipients(["developer.timmy@gmail.com"])
        mailComposerVC.setSubject("Weather Simplicity Feedback")
        mailComposerVC.setMessageBody("Hello,\n\nI would like to share the following feedback...\n\n", isHTML: false)

        return mailComposerVC

    }

    func showSendMailErrorAlert() {

        let sendMailErrorAlert = UIAlertController(title: "Error", message: "Your device could not send the email. Check your email configurations and try again.", preferredStyle: UIAlertControllerStyle.Alert)
        let okay = UIAlertAction(title: "Okay", style: UIAlertActionStyle.Default, handler: nil)
        sendMailErrorAlert.addAction(okay)
        self.presentViewController(sendMailErrorAlert, animated: true, completion: nil)
    }

    func mailComposeController(controller: MFMailComposeViewController, didFinishWithResult result: MFMailComposeResult, error: NSError?) {

        switch result {

        case MFMailComposeResultCancelled:
            print("Cancelled mail")
            break
        case MFMailComposeResultSent:
            print("Message sent")
            break
        default:
            break
        }

        self.dismissViewControllerAnimated(true, completion: nil)

    }

}

Answer 1

仅在需要时在 didSelectRow 中而不是在创建视图控制器时尝试创建新的 mailViewController。这将确保它每次都是干净的，除非需要，否则不会创建，并且可能会解决第二次取消不起作用的问题。

Swift 2：第二次尝试 Table 视图后电子邮件取消按钮停止工作

Swift 2: Email Cancel Button Stops Working After Second Try on a Table View

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