为不同的按钮创建单独的主题？答案

【问题标题】：Creating a separate subject for a different button?为不同的按钮创建单独的主题？
【发布时间】：2018-02-06 19:59:37
【问题描述】：

我试图让我用if indexPath.section == 1 && indexPath.row == 0 和if indexPath.section == 1 && indexPath.row == 1 显示的两个不同按钮在我提取电子邮件时具有不同的主题。两个按钮拉出同一个主题（建议：）。我将如何让程序区分它们？

import UIKit
import Foundation
import MessageUI

class AccountViewController: UITableViewController, MFMailComposeViewControllerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
        self.navigationController?.navigationBar.shadowImage = UIImage()
        self.navigationController?.navigationBar.isTranslucent = false
        self.navigationController?.view.backgroundColor = .clear

    }

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        if indexPath.section == 1 && indexPath.row == 1{
            print("pressed")
            let mailComposeViewController2 = configureMailController()
            if MFMailComposeViewController.canSendMail() {
                self.present(mailComposeViewController2, animated: true, completion: nil)
            } else {
                showMailError()
            }
        }
        if indexPath.section == 1 && indexPath.row == 0 {
            print("pressed")
            let mailComposeViewController = configureMailController()
            if MFMailComposeViewController.canSendMail() {
                self.present(mailComposeViewController, animated: true, completion: nil)
            } else {
                showMailError()
            }
        }
    }
    //if indexPath.section == 1 && indexPath.row == 1 {

    //}
        func configureMailController() -> MFMailComposeViewController {
            let mailComposerVC = MFMailComposeViewController()
            mailComposerVC.mailComposeDelegate = self
            mailComposerVC.setToRecipients(["SolsticeOfficialLLC@gmail.com"])
            mailComposerVC.setSubject("Suggestion: ")

            return mailComposerVC
        }
        func configureMailController2() -> MFMailComposeViewController {
            let mailComposerVC = MFMailComposeViewController()
            mailComposerVC.mailComposeDelegate = self
            mailComposerVC.setToRecipients(["SolsticeOfficialLLC@gmail.com"])
            mailComposerVC.setSubject("Report: ")

            return mailComposerVC
        }
        func showMailError() {
            let sendMailErrorAlert = UIAlertController(title: "Could not send email", message: "Your device could not send email", preferredStyle: .alert)
            let dismiss = UIAlertAction(title: "OK", style: .default, handler: nil)
            sendMailErrorAlert.addAction(dismiss)
            self.present(sendMailErrorAlert, animated: true, completion: nil)
        }
    func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith: MFMailComposeResult, error: Error?){
            controller.dismiss(animated: true, completion: nil)
        }

}

【问题讨论】：

标签： swift xcode uitableview mfmailcomposeviewcontroller

【解决方案1】：

您在两个按钮上调用相同的方法。像这样更改您的代码。

import UIKit
import Foundation
import MessageUI

class AccountViewController: UITableViewController, MFMailComposeViewControllerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
        self.navigationController?.navigationBar.shadowImage = UIImage()
        self.navigationController?.navigationBar.isTranslucent = false
        self.navigationController?.view.backgroundColor = .clear

    }

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        if indexPath.section == 1 && indexPath.row == 1{
            print("pressed")
            let mailComposeViewController2 = configureMailController2() //Your error was in this line
            if MFMailComposeViewController.canSendMail() {
                self.present(mailComposeViewController2, animated: true, completion: nil)
            } else {
                showMailError()
            }
        }
        if indexPath.section == 1 && indexPath.row == 0 {
            print("pressed")
            let mailComposeViewController = configureMailController()
            if MFMailComposeViewController.canSendMail() {
                self.present(mailComposeViewController, animated: true, completion: nil)
            } else {
                showMailError()
            }
        }
    }
    //if indexPath.section == 1 && indexPath.row == 1 {

    //}
        func configureMailController() -> MFMailComposeViewController {
            let mailComposerVC = MFMailComposeViewController()
            mailComposerVC.mailComposeDelegate = self
            mailComposerVC.setToRecipients(["SolsticeOfficialLLC@gmail.com"])
            mailComposerVC.setSubject("Suggestion: ")

            return mailComposerVC
        }
        func configureMailController2() -> MFMailComposeViewController {
            let mailComposerVC = MFMailComposeViewController()
            mailComposerVC.mailComposeDelegate = self
            mailComposerVC.setToRecipients(["SolsticeOfficialLLC@gmail.com"])
            mailComposerVC.setSubject("Report: ")

            return mailComposerVC
        }
        func showMailError() {
            let sendMailErrorAlert = UIAlertController(title: "Could not send email", message: "Your device could not send email", preferredStyle: .alert)
            let dismiss = UIAlertAction(title: "OK", style: .default, handler: nil)
            sendMailErrorAlert.addAction(dismiss)
            self.present(sendMailErrorAlert, animated: true, completion: nil)
        }
    func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith: MFMailComposeResult, error: Error?){
            controller.dismiss(animated: true, completion: nil)
        }

}

【讨论】：

【解决方案2】：

您正在为两行调用 configureMailController，而您应该为第二行调用 configureMailController2

【讨论】：