UIButton不會顯示MFMailViewController

我遇到了一點代碼錯誤。我對此很陌生，我正在努力教導自己。我在網上找到了大部分答案，但似乎無法找到有關此特定問題的任何信息。我想在應用程序內發送電子郵件，但每次按下電子郵件按鈕時，MFMailViewController都不會出現。這就像我的UIButton不工作。但我知道我將它作爲IBAction。這是我的代碼到目前爲止。任何幫助深表感謝。UIButton不會顯示MFMailViewController

import UIKit 
import MessageUI 

class RequestService: UIViewController,MFMailComposeViewControllerDelegate { 
    @IBOutlet weak var CustomerName: UITextField! 
    @IBOutlet weak var emailButton: UIButton! 

    @IBAction func sendEmail(_ sender: UIButton) { 
     if !MFMailComposeViewController.canSendMail() { 
      print("Mail services are not available") 

      let ComposeVC = MFMailComposeViewController() 
      ComposeVC.mailComposeDelegate = self 

      ComposeVC.setToRecipients(["[email protected]"]) 
      ComposeVC.setSubject("New Support Ticket") 
      ComposeVC.setMessageBody(CustomerName.text!, isHTML: false) 

      self.present(ComposeVC, animated: true, completion: nil) 
     } 

     func mailComposeController(controller: MFMailComposeViewController,didFinishWithResult result:MFMailComposeResult, error: NSError?) { 
      // Check the result or perform other tasks. 
      // Dismiss the mail compose view controller. 
      controller.dismiss(animated: true, completion: nil) 
     } 
    } 
}

來源

2017-02-21 Jarren Welch

你在模擬器中測試這個嗎？這隻適用於實際的iPhone設備。 –

您在sendMail函數的語法中犯了一個錯誤。您發佈的代碼只會打開視圖控制器，如果設備不能發送郵件。更改爲：

@IBAction func sendEmail(_ sender: UIButton) { 
    if !MFMailComposeViewController.canSendMail() { 
     print("Mail services are not available") 
     return 
    } 

    let composeVC = MFMailComposeViewController() 
    composeVC.mailComposeDelegate = self 
    composeVC.setToRecipients(["[email protected]"]) 
    composeVC.setSubject("New Support Ticket") 
    composeVC.setMessageBody(CustomerName.text!, isHTML: false) 

    self.present(composeVC, animated: true, completion: nil) 
}

來源

2017-02-21 22:33:24

即使無法發送電子郵件，您爲什麼仍會繼續提供郵件編輯器？ – rmaddy

@rmaddy修正，謝謝。 –

你們知道你的東西！我只是改變了你所說的話，它完美無瑕！ –

你只嘗試顯示郵件控制器如果設備不能發送電子郵件。這是倒退。

@IBAction func sendEmail(_ sender: UIButton) { 
    if MFMailComposeViewController.canSendMail() { 
     print("Mail services are not available") 

     let ComposeVC = MFMailComposeViewController() 
     ComposeVC.mailComposeDelegate = self 

     ComposeVC.setToRecipients(["[email protected]"]) 
     ComposeVC.setSubject("New Support Ticket") 
     ComposeVC.setMessageBody(CustomerName.text!, isHTML: false) 

     self.present(ComposeVC, animated: true, completion: nil) 
    } 
} 

func mailComposeController(controller: MFMailComposeViewController,didFinishWithResult result:MFMailComposeResult, error: NSError?) { 
    // Check the result or perform other tasks. 
    // Dismiss the mail compose view controller. 
    controller.dismiss(animated: true, completion: nil) 
}

而且您需要其他方法之外的委託方法。

來源

2017-02-21 22:32:27 rmaddy

UIButton不會顯示MFMailViewController

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