连锁多个Alamofire请求

本文介绍了连锁多个Alamofire请求的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在寻找一个可以链接多个HTTP请求的好模式。我想使用Swift，最好是 Alamofire 。

I'm looking for a good pattern with which I can chain multiple HTTP requests. I want to use Swift, and preferrably Alamofire.

Say，for例如，我想执行以下操作：

Say, for example, I want to do the following:

发出PUT请求

发出GET请求

重新加载数据表

似乎 promises 可能非常适合这种情况。如果我可以这样做， PromiseKit 可能是一个不错的选择：

It seems that the concept of promises may be a good fit for this. PromiseKit could be a good option if I could do something like this:

NSURLConnection.promise( Alamofire.request( Router.Put(url: "httbin/put") ) ).then { (request, response, data, error) in Alamofire.request( Router.Get(url: "httbin/get") ) }.then { (request, response, data, error) in // Process data }.then { () -> () in // Reload table }

但这是不可能的或至少我不知道它。

but that's not possible or at least I'm not aware of it.

如果不嵌套多个方法，我怎样才能实现这个功能？

How can I achieve this functionality without nesting multiple methods?

我是iOS的新手，所以也许有一些我缺少的基础知识。我在其他框架（如Android）中所做的是在后台进程中执行这些操作并使请求同步。但 Alamofire本质上是异步的，因此该模式不是一种选择。

I'm new to iOS so maybe there's something more fundamental that I'm missing. What I've done in other frameworks such as Android is to perform these operations in a background process and make the requests synchronous. But Alamofire is inherently asynchronous, so that pattern is not an option.

推荐答案

在promises中包装其他异步内容的方式如下：

Wrapping other asynchronous stuff in promises works like this:

func myThingy() -> Promise<AnyObject> { return Promise{ fulfill, reject in Alamofire.request(.GET, "httpbin/get", parameters: ["foo": "bar"]).response { (_, _, data, error) in if error == nil { fulfill(data) } else { reject(error) } } } }

编辑：现在，使用： github/PromiseKit/Alamofire-