switch-statement – 发送电子邮件 – MFMailComposeResult

我正在尝试将我的一个应用程序从Obj-C迁移到 Swift,并且我有电子邮件管理的问题.
我在几小时内搜索,但是我没有找到如何解决这个问题.
基本上,我试图迁移func mailComposeController(控制器：MFMailComposeViewController !,didFinishWithResult结果：MFMailComposeResult,错误：NSError！)函数.

问题是在交换机内没有选项是有效的.

func mailComposeController(controller: MFMailComposeViewController!,didFinishWithResult result: MFMailComposeResult,error: NSError!)
{
    switch result.value
    {
        case CUnsignedInt(MFMailComposeResultCancelled):
            var alert = UIAlertController(
                title: NSLocalizedString("sendingStatus",tableName: "LocalizationFile",comment:"sendingStatus"),message: NSLocalizedString("emailCancelledByUser",comment:"emailCancelledByUser"),preferredStyle: UIAlertControllerStyle.Alert)
            self.presentViewController(alert,animated: true,completion: nil)
        case MFMailComposeResult(MFMailComposeResultFailed):
            var alert = UIAlertController(
                title: NSLocalizedString("sendingStatus",message: NSLocalizedString("emailSentFailed",comment:"emailSentFailed"),completion: nil)
        case MFMailComposeResultSaved:
            var alert = UIAlertController(
                title: NSLocalizedString("sendingStatus",message: NSLocalizedString("emailSaved",comment:"emailSaved"),completion: nil)
        default:
            var alert = UIAlertController(
                title: NSLocalizedString("sendingStatus",message: NSLocalizedString("emailNotSent",comment:"emailNotSent"),completion: nil)
    }
}

var result:MFMailComposeResult = MFMailComposeResultCancelled

    switch(result.value) { // <-- Here,note .value is being used
        case MFMailComposeResultCancelled.value: // <-- And here as well!
            print("Cancelled")
        default:
            print("Default")
    }