无法将“Result”类型的值转换为预期的参数类型“EmailContentData”

Question

enum Result {
case success(r: EmailContentData)
case failure(e: Error)}


static func getMessageList(index : Int, pageCount: Int, completion : @escaping (EmailContentData) -> ())
{
    DispatchQueue.global(qos: .userInteractive).async
        {
            let apiString : String = String(index) + "/" + String(pageCount)
            var objEmailContentData : EmailContentData? = EmailContentData.init(fromDictionary: NSDictionary())

            ApiHelper.sharedSession.post(Constant.API.messagelistApi + apiString, postData: NSDictionary(), methodtype: Constant.API.httpGet) { (isError, data, errorDescription) in
                guard let data = data else { return }
                do {
                    let result = EmailContentData.init(fromDictionary: data.value(forKey:"data") as! NSDictionary)
                    completion(Result.success(r: result))
                } catch let error {
                    completion(Result.failure(e: error))
                }
            }
    }
}

我在成功时遇到错误“无法将 'Result' 类型的值转换为预期的参数类型 'EmailContentData'” 和类似的完成错误“无法将'Result'类型的值转换为预期的参数类型'EmailContentData'”

请任何人告诉我我做错了什么？提前致谢:-)

Answer 1

使用@escaping (Result) -> () 而不是@escaping (EmailContentData) -> ()

static func getMessageList(index : Int, pageCount: Int, completion : @escaping (Result) -> ())
{
    DispatchQueue.global(qos: .userInteractive).async
        {
            let apiString : String = String(index) + "/" + String(pageCount)
            var objEmailContentData : EmailContentData? = EmailContentData.init(fromDictionary: NSDictionary())

            ApiHelper.sharedSession.post(Constant.API.messagelistApi + apiString, postData: NSDictionary(), methodtype: Constant.API.httpGet) { (isError, data, errorDescription) in
                guard let data = data else { return }
                do {
                    let result = EmailContentData.init(fromDictionary: data.value(forKey:"data") as! NSDictionary)
                    completion(Result.success(r: result))
                } catch let error {
                    completion(Result.failure(e: error))
                }
            }
    }
}