快速 2 个开机自检和响应代码来转换有用的功能

Question

我想将参数字符串和 url 发送到函数，我想返回 JSON 成功和消息字符串。请帮忙。

以下是我的代码：

 let postEndpoint:NSString = "http://bla.com/application/login.php?email=(username)&password=(password)"

            print(postEndpoint)
            guard let url = NSURL(string: postEndpoint as String) else {
                print("Error: cannot create URL")
                return
            }
            let urlRequest = NSURLRequest(URL: url)

            let config = NSURLSessionConfiguration.defaultSessionConfiguration()
            let session = NSURLSession(configuration: config)
            let task = session.dataTaskWithRequest(urlRequest, completionHandler: { (data, response, error) in
                guard let responseData = data else {
                    print("Error: did not receive data")
                    return
                }
                guard error == nil else {
                    print("error calling GET on /posts/1")
                    print(error)
                    return
                }
                // parse the result as JSON, since that's what the API provides
                let post: NSDictionary
                do {
                    post = try NSJSONSerialization.JSONObjectWithData(responseData,
                        options: []) as! NSDictionary
                } catch  {
                    print("error trying to convert data to JSON")
                    return
                }
                // now we have the post, let's just print it to prove we can access it
               // print("The post is: " + post.description)
                // the post object is a dictionary
                // so we just access the title using the "title" key
                // so check for a title and print it if we have one
                if let durum = post["success"] as? String {
                    print("Success : " + durum)
                }

                if let postTitle = post["message"] as? String {
                    print("Message : " + postTitle)
                }
            })
            task.resume()

我想实现这样的事情：

func post(params : Dictionary<String, String>, url : String) {
.... code is here
}

并返回以下内容：

杜伦和带有字符串的后标题。

谢谢。

Answer 1

对于异步方法，如果要返回结果，最好使用完成闭包。

    typealias Response = (durum: String, postTitle: String)
    typealias Completion = ((Response?, ErrorType?) -> Void)?
    func post(params : Dictionary<String, String>, url : String, completion:Completion) {
            //.... code is here
           completion?((durum, postTitle), nil)
    }