Swift_2022_网络请求

一、网络请求步骤

1. 设置请求url
2. 设置URLRequest对象，配置请求相关信息
3. 创建会话配置URLSessionConfiguration
4. 创建会话URLSession
5. 创建任务和设置请求回调，并发起请求

_{一般通过以上几个步来完成网络请求，当然要根据不同应用场景来配置请求属性。}

二、使用

1、原生

json转dic

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//json转dic func getDictionaryFromJSONString(jsonString:String) ->NSDictionary{     let jsonData:Data = jsonString.data(using: .utf8)!     let dict = try? JSONSerialization.jsonObject(with: jsonData, options: .mutableContainers)     if dict != nil {         return dict as! NSDictionary     }     return NSDictionary() }

Get

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func makeLogon() {     // 构建URL     let url:URL = URL(string: "https://xxx/xxx/API?xxx")!     // 发送HTTP请求的的session对象     let session = URLSession.shared     // 构建请求request     var request = URLRequest(url: url)     request.httpMethod = "GET"     // 发一个get请求     let task = session.dataTask(with: request as URLRequest) {(         data, response, error) in                   guard let data = data, let _:URLResponse = response, error == nil else {             print("error")             return         }         let dataString =  String(data: data, encoding: String.Encoding.utf8)         let dict = self.getDictionaryFromJSONString(jsonString: dataString!)         print(dict)     }     task.resume() }

Post

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func makeUpdateCountSheet() {     // 这里直接使用 jsonString 转成字典，然后转成 Data，将 流 放到 request的 httpBody中， 模拟发送一个http请求     let jsonString = "{\"Data\":{\"xxx\":\"834\",\"xxx\":[{\"xxx\":[{\"xxx\":\"031019\",\"xxx\":\"ADD\",\"xxx\":\"9\"},{\"xxx\":\"5651G-06920ADBAA\",\"xxx\":\"ADD\",\"xxx\":\"6\"}],\"xxx\":\"xxx\",\"Counted\":true,\"xxx\":true,\"LineNum\":\"1\",\"xxx\":\"235\",\"Quantity\":\"15\"}],\"xxx\":\"\",\"Initials\":\"we\",\"xxx\":true},\"xxx\":\"\"}"     let dict = self.getDictionaryFromJSONString(jsonString: jsonString)     print(dict)     var  jsonData = NSData()     do {          jsonData = try JSONSerialization.data(withJSONObject: dict, options: .prettyPrinted) as NSData     } catch {         print(error.localizedDescription)     }     // 构建URL     let url:URL = URL(string: "https://xxx/xxx/API?xxx")!     // session     let session = URLSession.shared     // request     var request = URLRequest(url: url)     request.httpMethod = "POST"     // 设置Content-Length，非必须     request.setValue("\(jsonData.length)", forHTTPHeaderField: "Content-Length")     // 设置 Content-Type 为 json 类型     request.setValue("application/json", forHTTPHeaderField: "Content-Type")     // POST    请求将 数据 放置到 请求体中     request.httpBody = jsonData as Data     // 发送请求     let task = session.dataTask(with: request as URLRequest) {(         data, response, error) in           guard let data = data, let _:URLResponse = response, error == nil else {             print("error")             return         }         // 返回值 utf8 转码         let dataString =  String(data: data, encoding: String.Encoding.utf8)         // 将 jsonString 转成字典         let dict = self.getDictionaryFromJSONString(jsonString: dataString!)         print(dict)     }     task.resume() }

2、Alamofire 

3、Moya+Alamofire 

Moya是一个对Alamofire封装的库，提供简洁的接口供开发者调用，抽象了URL和Parameters来帮助使用者生成urlRequest，最后通过alamofire发起请求。
具体使用时在Moya和Your App之间加一层Rx，用于处理请求回来的数据