为什么不能关闭 MFMailComposerViewController？

Question

每当我按 "Cancel" 然后按 "Delete Draft" 时，邮件编辑器都不会被关闭。我得到的错误是 "Thread 1: EXC_BAD_ACCESS (code=1, address=0x40363380)"

在我的 TableViewController 中我有：

@IBAction func mailButton(sender: AnyObject) {
    let emailComposer = EmailComposer()
    if email != "" {
        print(email)
        if emailComposer.canSendMail() {
            emailComposer.setRecipient(email)
            let configuredMailComposeViewController = emailComposer.configuredMailComposeViewController()
            presentViewController(configuredMailComposeViewController, animated: true, completion: nil)
        }
    } else {
        let alertController = UIAlertController(title: "Sorry!", message: "No email found for this contact", preferredStyle: .Alert)
        alertController.addAction(UIAlertAction(title: "OK", style: .Default, handler: { (action) -> Void in
            //do nothing
        }))
         self.presentViewController(alertController, animated: true, completion:nil)
    }

}

Answer 1

对于那些不知道的人，EXC_BAD_ACCESS 意味着它试图访问内存中不再存在的东西。我 错误地 在点击按钮后创建了 EmailComposer() 对象，因此它超出了范围。所以这个：

let emailComposer = EmailComposer()

...应该是在这里创建的，例如：

class TableViewController: UITableViewController {

let emailComposer = EmailComposer()

为什么不能关闭 MFMailComposerViewController？

Why can't won't the MFMailComposerViewController be dismissed?

swift

mfmailcomposeviewcontroller