无法使用Combine执行urlSession请求

import Combine
import Foundation

// 创建一个URLSessionPublisher
let url = URL(string: "https://example.com")!
let publisher = URLSession.shared.dataTaskPublisher(for: url)

// 使用Combine的操作符对请求结果进行处理
let cancellable = publisher
    .tryMap { data, response in
        // 处理请求结果
        guard let httpResponse = response as? HTTPURLResponse,
              httpResponse.statusCode == 200 else {
            throw URLError(.badServerResponse)
        }
        return data
    }
    .decode(type: MyModel.self, decoder: JSONDecoder())
    .sink(
        receiveCompletion: { completion in
            // 处理请求完成事件
            switch completion {
            case .finished:
                print("请求完成")
            case .failure(let error):
                print("请求失败：\(error)")
            }
        },
        receiveValue: { model in
            // 处理请求结果
            print("请求结果：\(model)")
        }
    )

// 取消请求
cancellable.cancel()