为什么使用AFNetworking而不是dispatch_async？ [英] Why use AFNetworking instead of dispatch_async?

问题描述

为什么要使用AFNetworking的异步方法，只需使用GCD即可完成异步调用？

Why should one use AFNetworking's async methods, when an async call can be done simply with GCD?

dispatch_async(bgQ, ^{

                //NSURLConnection code

                dispatch_async(dispatch_get_main_queue(), ^{
                    //UI code
                });
});

推荐答案

这在<＃的顶部详细解答a href =https://github.com/AFNetworking/AFNetworking/wiki/AFNetworking-FAQ> AFNetworking常见问题解答：

当 NSURLConnection 提供 + sendAsynchronousRequest：queue：completionHandler：和 + sendSynchronousRequest：returningResponse：错误：，使用AFNetworking有很多好处：

While NSURLConnection provides +sendAsynchronousRequest:queue:completionHandler: and +sendSynchronousRequest:returningResponse:error:, there are many benefits to using AFNetworking:

• AFURLConnectionOperation 及其子类继承自 NSOperation ，它允许取消，暂停/恢复请求，并通过 NSOperationQueue 。


• AFURLConnectionOperation 还允许您轻松地上传和下载流，处理身份验证挑战，>监控上传和下载进度，并控制缓存行为或请求。


• AFHTTPRequestOperation 和它的子类基于HTTP>状态代码和内容类型区分成功和不成功的请求。


• AFNetworking包括转换 NSData 更多可用的格式，如JSON，> XML，图像和属性列表。


• AFHTTPClient 提供了一个方便的交互界面使用Web服务，包括默认标头，身份验证，>网络可访问性监控，批量操作，查询字符串参数序列化和多部分表单请求。


• UIImageView + AFNetworking 添加了一种方便的方式来异步加载图片。

• AFURLConnectionOperation and its subclasses inherit from NSOperation, which allows requests to be cancelled, > suspended / resumed, and managed by an NSOperationQueue.
• AFURLConnectionOperation also allows you to easily stream uploads and downloads, handle authentication challenges, > monitor upload and download progress, and control the caching behavior or requests.
• AFHTTPRequestOperation and its subclasses distinguish between successful and unsuccessful requests based on HTTP > status codes and content type.
• AFNetworking includes media-specific request operations that transform NSData into more useable formats, like JSON, > XML, images, and property lists.
• AFHTTPClient provides a convenient interface to interact with web services, including default headers, authentication, > network reachability monitoring, batched operations, query string parameter serialization, and multipart form requests.
• UIImageView+AFNetworking adds a convenient way to asynchronously loads images.

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