ios网络:应用一个请求的7个步骤

Splitting big tasks into small tasks is often one of the best ways to solve a problem. Thus, in the next few exercises, we will split each request/method into a 7 step process. In the source code, I have commented each of these steps to assist you as you implement the requests.

7 Step Process

1. Set the parameters
   • Specify any parameters for the web service method that should be included in the final url
   • For example, if the final URL is https://api.themoviedb.org/3/authentication/token/new?api_key=ENTER_YOUR_API_KEY_HERE, then in this step you should set the API key
2. Build the URL
   • Combine the base URL, the method being used, and the parameters to create the final URL for the request
3. Configure the request
   • Create a NSURLRequest or NSMutableURLRequest using the URL
   • (If necessary) When using a NSMutableURLRequest, you may need to configure the request's header fields and HTTP body
4. Make the request
   • Using the shared NSURLSession singleton, issue the request and specify a completion handler
5. Parse the data
   • Assuming there is no error when the request returns, parse the response data into a usable type like a NSDictionary, NSArray, or [String:AnyObject], ...
6. Use the data!
   • Extract the data required for the specified task
7. Start the request
   • To initiate the request, it must be started (resumed)