链接多个 Alamofire 请求 [英] Chain multiple Alamofire requests

问题描述

我正在寻找一种可以链接多个 HTTP 请求的良好模式.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.

比如说，我想做以下事情:

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

1. 发出 PUT 请求
2. 发出 GET 请求
3. 用数据重新加载表格

promises 的概念似乎很适合这种情况.如果我可以做这样的事情，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: "http://httbin.org/put")
    )
).then { (request, response, data, error) in
    Alamofire.request(
        Router.Get(url: "http://httbin.org/get")
    )   
}.then { (request, response, data, error) in
    // Process data
}.then { () -> () in
    // Reload table
}

但那是不可能的，或者至少我不知道.

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

如何在不嵌套多个方法的情况下实现此功能?

How can I achieve this functionality without nesting multiple methods?

我是 iOS 新手，所以也许我缺少一些更基本的东西.我在Android等其他框架中所做的是在后台进程中执行这些操作并使请求同步.但是Alamofire 本质上是异步的，所以这种模式不是一种选择.

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 Promise 中包装其他异步内容的工作方式如下:

Wrapping other asynchronous stuff in promises works like this:

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

现在，使用:https://github.com/PromiseKit/Alamofire-

这篇关于链接多个 Alamofire 请求的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！