如何在URLSession Swift中获取响应正文？

// 1. 创建一个URL对象
guard let url = URL(string: "https://example.com/api/data") else {
    print("Invalid URL")
    return
}

// 2. 创建一个URLSession对象
let session = URLSession.shared

// 3. 创建一个URLSessionDataTask对象
let dataTask = session.dataTask(with: url) { (data, response, error) in
    // 5. 检查响应状态码和错误
    guard let httpResponse = response as? HTTPURLResponse,
          httpResponse.statusCode == 200,
          error == nil else {
        print("Error: \(error?.localizedDescription ?? "Unknown error")")
        return
    }
    
    // 6. 获取响应正文的数据
    if let responseData = data {
        // 7. 进一步处理响应正文的数据
        let responseString = String(data: responseData, encoding: .utf8)
        print("Response: \(responseString ?? "")")
    }
}

// 4. 发送请求
dataTask.resume()