完成处理程序内的完成处理程序

Question

我正在与JWT代币和Alamofire一起使用Swift。我的问题是，当请求返回nil时，我希望request-method运行refreshToken（）方法并重试HTTP请求。我的代码看起来像这样。我试图自己跑，但没有成功。 :(

// Internal method used for the HTTP methods
private func request<A>(resource: Resource<A>, method: Alamofire.HTTPMethod, parameters: [String:String], completion: @escaping (A?) -> ()) {

let requestUrl = self.baseurl.absoluteString + resource.url.absoluteString + "?token=" + self.loginManager.getFromKeychain().token!

    Alamofire.request(requestUrl, method: method, parameters: parameters).response { response in

        // Check if response need reauth
        if(response.response?.statusCode == 401 || response.response?.statusCode == 400) {

            self.refreshToken(completion: { result in

                if(result) {
                    print("Token got refreshed")

                    // How do i make the request again?

                }

            })

        }

        guard let data = response.data else {
            completion(nil)
            return
        }

        completion(resource.parse(data as NSData))

    }

}

Answer 1

你的方法成为：

private func request<A>(resource: Resource<A>, method: Alamofire.HTTPMethod, parameters: [String:String], completion: @escaping (A?, error: Int?) -> ()) {

    let requestUrl = self.baseurl.absoluteString + resource.url.absoluteString + "?token=" + self.loginManager.getFromKeychain().token!

    Alamofire.request(requestUrl, method: method, parameters: parameters).response { response in

        // Check if response need reauth
        if(response.response?.statusCode == 401 || response.response?.statusCode == 400) {
            completion(nil, response.response?.statusCode)
        }

        guard let data = response.data else {
            completion(nil, nil)
            return
        }

        completion(resource.parse(data as NSData, nil)

    }
}

你的方法叫做

func myMethod(resource: Resource<A>, method: Alamofire.HTTPMethod, parameters: [String:String]) { 
    self.request(resource: resource, method: method, parameters: parameters) { (result, errorCode) in 
    if let errorCode = errorCode {
        self.refreshToken(completion: { res in
            if(res) {
                print("Token got refreshed")

                // How do i make the request again?
                self.myMethod(resource: resource, method: method, parameters: parameters)
            }
        })
    }
    else if let result = result {
        //ok got a result
    }
}