无法将类型“[String : String]”的值转换为预期的参数类型 'HTTPHeaders?'

Question

我正在尝试使用 Mailgun 和 Alarmofire 从我的 iOS 应用程序发送邮件我发现 this piece of code 但 Xcode 生成错误：

Cannot convert value of type '[String : String]' to expected argument type 'HTTPHeaders?'

代码：

let parameters = [
                   "from": "sender@whatyouwant.com",
                     "to": "anyRecipient@example.com",
                "subject": "Subject of the email",
                   "text": "This is the body of the email."]
    let header = [
            "Authorization": "Basic MY-API-KEY",
            "Content-Type" : "application/x-www-form-urlencoded"]

    let url = "https://api.mailgun.net/v3/MY-DOMAIN/messages"
    Alamofire.request(url,
                   method: .post,
               parameters: parameters,
                 encoding: URLEncoding.default,
                  headers: header)
            .responseJSON { response in
                print("Response: \(response)")
                }

有什么建议吗？

Answer 1

您需要明确设置类型。

let headers : HTTPHeaders = [
    "Authorization": "Basic MY-API-KEY",
    "Content-Type" : "application/x-www-form-urlencoded"
]

Answer 2

要修改现有代码，请创建字典扩展以从 [String: String] 转换为 HTTPHeaders。

extension Dictionary where Key == String, Value == String {
    func toHeader() -> HTTPHeaders {
        var headers: HTTPHeaders = [:]
        for (key, value) in self  {
            headers.add(name: key, value: value)
        }
        return headers
    }
}

并使用这个扩展来投射它。

AF.request(url, method: requestMethod, parameters: nil, encoding: URLEncoding.default ,headers: header?.toHeader())

无法将类型“[String : String]”的值转换为预期的参数类型 'HTTPHeaders?'

Cannot convert value of type '[String : String]' to expected argument type 'HTTPHeaders?'

mailgun

swift

alamofire