MFMailComposeViewController出现一秒钟然后消失

Question

我已经按照Swift指南完成了MFMailComposeViewController（）的常规设置

https://developer.apple.com/library/prerelease/ios/documentation/MessageUI/Reference/MFMailComposeViewController_class/

但是当我运行此命令时，电子邮件出现了一秒钟，消失了，并且出现错误消息“ MailCompositionService意外退出”。

这是完整的代码

import Foundation
import UIKit
import MessageUI

class ViewController: UIViewController, MFMailComposeViewControllerDelegate {

@IBAction func showEmail(sender: AnyObject) {

    let composeVC = MFMailComposeViewController()
    composeVC.mailComposeDelegate = self
    // Configure the fields of the interface.
    composeVC.setToRecipients(["address@example.com"])
    composeVC.setSubject("Hello!")
    composeVC.setMessageBody("Hello from California!", isHTML: false)

    // Present the view controller modally.
    self.presentViewController(composeVC, animated: true, completion: nil)
}

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

    switch result.rawValue {
    case MFMailComposeResultCancelled.rawValue:
        print("Mail cancelled")
    case MFMailComposeResultSaved.rawValue:
        print("Mail saved")
    case MFMailComposeResultSent.rawValue:
        print("Mail sent")
    case MFMailComposeResultFailed.rawValue:
        print("Mail sent failure: \(error!.localizedDescription)")
    default:
        break
    }
    controller.dismissViewControllerAnimated(true, completion: nil)
}}

Answer 1

这是xcode模拟器中的一个已知错误。 它应该可以在您的设备上正常工作。

Answer 2

您的代码是正确的。 MFMailComposeViewController组件只能在device的iOS simulator无法测试。

如果您在Apple Developer Forums查看此主题 ，则该问题在Apple Bug Report有票证，但仍然没有任何修复。