Swift发送网络请求

信息

现有的版本苹果推荐使用 NSURLSession 来替换 NSURLConnection 完成网路请求相关操作.NSURLSession 的使用非常简单，先根据会话对象创建一个请求 Task，然后执行该 Task 即可。

URL+URLSession

例子1

import SwiftUI
import CoreData


let url = URL(string: "https://api.muxiaoguo.cn/api/yiyan?api_key=c589aa12a29b1360&")!

let task = URLSession.shared.dataTask(with: url) {(data, response, error) in
    guard let data = data else { return }
    print(String(data: data, encoding: .utf8)!)
}

task.resume()

例子2

请求并解析JSON数据到Swift对象

import SwiftUI

struct Response: Codable {
    var results: [Result]
}

struct Result: Codable {
    var trackId: Int
    var trackName: String
    var collectionName: String
}

struct ContentView: View {
   @State private var results = [Result]()
    
    func loadData() async{
        guard let url = URL(string: "https://itunes.apple.com/search?term=taylor+swift&entity=song") else {
            print("Invalid URL")
            return
        }
        do {
            let (data, _) =  try await URLSession.shared.data(from: url)
            print(data)
            if let decodeResponse = try? JSONDecoder().decode(Response.self, from: data){
                results = decodeResponse.results
            }
        }catch{
            print("Invalid data")
        }
    }
    var body: some View {
        List(results, id: \.trackId){ item in
            VStack(alignment: .leading){
                Text(item.trackName)
                    .font(.headline)
                Text(item.collectionName)
            }
        }
        .task {
            await loadData()
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

发送请求

1. 确定请求路径
2. 创建请求对象
3. 创建会话对象
4. 根据会话对象创建请求任务
5. 执行 Task
6. 当得到服务器返回的响应后，解析数据（XML|JSON|HTTP）

发送GET请求

示例代码

发送POST请求

示例代码