MFMailComposeViewController in Swift does not dismiss

问题

This is sample code:

import UIKit
import MessageUI

class ViewController: UIViewController, MFMailComposeViewControllerDelegate {

@IBAction func showEmail(sender : AnyObject) {
    var emailTitle = "Test Email"
    var messageBody = "This is a test email body"
    var toRecipents = ["a.nakhimov@gmail.com"]
    var mc: MFMailComposeViewController = MFMailComposeViewController()
    mc.mailComposeDelegate = self
    mc.setSubject(emailTitle)
    mc.setMessageBody(messageBody, isHTML: false)
    mc.setToRecipients(toRecipents)

    self.presentViewController(mc, animated: true, completion: nil)
}

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func mailComposeController(controller:MFMailComposeViewController, didFinishWithResult result:MFMailComposeResult, error:NSError) {
    switch result.value {
    case MFMailComposeResultCancelled.value:
        NSLog("Mail cancelled")
    case MFMailComposeResultSaved.value:
        NSLog("Mail saved")
    case MFMailComposeResultSent.value:
        NSLog("Mail sent")
    case MFMailComposeResultFailed.value:
        NSLog("Mail sent failure: %@", [error.localizedDescription])
    default:
        break
    }
    self.dismissModalViewControllerAnimated(true)
    // self.dismissViewControllerAnimated(true, completion: nil)
}

}

When I push the button, the function showEmail is executed and appears the form for send email. If I click "Send", then everything works fine - mail is sent, then the function mailComposeController is executed. NSLog displays the label "Mail sent" and the initial screen reappears.

If I'm in the dialog box of send mail, click "Cancel" button, then dialogue does not disappear, function mailComposeController does not work, two buttons - "Send" and "Cancel", becoming gray color and so it stays.

What wrong?

回答1:

Seems to be bug in iOS 8. Same problem exist in Objective-C also.

回答2:

You're trying to dismiss self instead of the MFMailComposeViewController (which isn't self).

Replace:

self.dismissModalViewControllerAnimated(true)

with:

controller.dismissViewControllerAnimated(true, completion: nil)

in the delegate method.

回答3:

Bug has been resolved. Everything is working as expected in iOS 8.1+ and Xcode 6.1+

The following fires and works fine

extension MainViewController: MFMailComposeViewControllerDelegate {
    func mailComposeController(controller: MFMailComposeViewController!, didFinishWithResult result: MFMailComposeResult, error: NSError!) {
        switch result.value {
        case MFMailComposeResultCancelled.value:
            NSLog("Mail cancelled")
        case MFMailComposeResultSaved.value:
            NSLog("Mail saved")
        case MFMailComposeResultSent.value:
            NSLog("Mail sent")
        case MFMailComposeResultFailed.value:
            NSLog("Mail sent failure: %@", [error.localizedDescription])
        default:
            break
        }
        self.dismissViewControllerAnimated(true, completion: nil)
    }
}

来源：https://stackoverflow.com/questions/24341881/mfmailcomposeviewcontroller-in-swift-does-not-dismiss