ios - 不允许在释放时尝试加载 View Controller 的 View ，这可能会导致未定义的行为

Question

我正在尝试实现发送邮件代码，但出现以下错误:

Attempting to load the view of a view controller while it is deallocating is not allowed and may result in undefined behavior

这是我的代码片段:

    if MFMailComposeViewController.canSendMail() {
        let mail = MFMailComposeViewController()
        mail.mailComposeDelegate = self
        mail.setToRecipients(["@gmail.com"])            
        presentViewController(mail, animated: true, completion: nil)
    } else {
        // show failure alert
    }

Answer 1

如果您忘记删除按钮的另一个功能的转场，则可能会发生您收到的错误。