在 Swift 中以循环作为正文发送电子邮件

Question

我想发送一封包含不同步骤和值的电子邮件，具体取决于用户在图像上编辑的内容。为此，我使用 UserDefaults 来保存值。

然后我将下一个代码放入 UIAlertController 中：

alert.addAction(UIAlertAction(title: "Send", style: .default)
        { action -> Void in
            //i is the last step register

            let nombre = alert.textFields![0]

            for n in 1...self.i {
                print("Step \(n): \(self.filterUserDefaults.string(forKey: "Step_\(n)")!)")
            }

            let filters = [
                "Brillo",
                "Exposicion",
                "Contraste",
                "Saturacion",
                "Saturacion_color",
                "Temperatura",
                "Blanco_Negro",
                "HUE",
                "Tintado_Rojo",
                "Tintado_Rosa",
                "Tintado_Naranja",
                "Tintado_Amarillo",
                "Tintado_Purpura",
                "Tintado_Verde",
                "Tintado_Azul",
                "Tintado_Marron",
                "Tintado_Gris"]
            for filter in filters {
                print("\(filter) = \(self.filterUserDefaults.float(forKey: filter).roundTo(places: 3))")
            }
            self.sendMail(filtro: nombre.text!, body: "XXXX")
        })
        present(alert, animated: true)
    }
    func sendMail(filtro: String, body: String) {
        if MFMailComposeViewController.canSendMail() {
            let mail = MFMailComposeViewController()
            mail.mailComposeDelegate = self
            mail.setToRecipients(["blablabla@gmail.com"])
            mail.setSubject("Filtro \(filtro)")
            mail.setMessageBody(body, isHTML: true)
            present(mail, animated: true)
        } else {
            print("Error presenting email app.")
        }
    }

所以打印工作如我所料，但问题是将这些打印件放入 sendMail 函数的主体中...

我试过了：

            var steps: [String]?

            for n in 1...self.i {
                steps = ["Step \(n): \(self.filterUserDefaults.string(forKey: "Step_\(n)")!)"]
            }
            .
            .
            .
            self.sendMail(filtro: nombre.text!, body: steps!.joined(separator: "\n"))

但是只有最后一步被写入正文的电子邮件而不是数组...

拜托，谁能帮帮我？

提前致谢！

Answer 1

你可以试试下面的代码

var steps: String = ""
for n in 1...self.i {
steps += "Step \(n): \(self.filterUserDefaults.string(forKey: "Step_\(n)")!)"
}

Answer 2

你快完成了，你需要初始化数组变量并使用 append

var steps = [String]()

for n in 1...self.i {
    steps.append("Step \(n): \(self.filterUserDefaults.string(forKey: "Step_\(n)")!)")
}
...
self.sendMail(filtro: nombre.text!, body: steps.joined(separator: "\n"))

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