1.创建API key

访问DeepSeek开放平台，登录你的账号，创建一个API Key，随便命名，我这里命名为Unity_API

复制并保存好提供的key，DeepSeek平台的规则只允许你在刚创建的时候查看一次key，之后就不能查看了，最好粘贴到记事本或文件传输助手当中

2.UI组件

在Unity中分别创建三个UI组件： Input Field获取用户的输入，Text用于显示DeepSeek返回的回答，Button用于发送用户的请求

3.编写脚本

创建空物体命名为DeepSeekChat，将我提供的代码复制粘贴，我们先获取到UI组件，我这里用public直接拖入，将刚刚获取到的API key填入到字段apiKey中，Json解析库依赖Newtonsoft.Json，如果没有需要下载并导入

c#
using UnityEngine;
using UnityEngine.Networking;
using System.Collections;
using System.Text;
using UnityEngine.UI;
using TMPro;
using System;
using Newtonsoft.Json;

public class DeepSeekChat : MonoBehaviour
{
    //>这里填你你创建好的API key即可
    public string apiKey = "";
    public string apiUrl = "https://api.deepseek.com/v1/chat/completions";
    public TMP_InputField inputField;
    public TextMeshProUGUI chatText;
    public Button btnResquest;
    bool isFirst = true;
    private void Start()
    {
        btnResquest.onClick.AddListener(SendMessageToDeepSeek);
    }

    public void SendMessageToDeepSeek()
    {
        string userMessage = inputField.text;
        //清空文本框
        chatText.text = "";
        StartCoroutine(PostRequest(userMessage));
    }

    IEnumerator PostRequest(string userMessage)
    {
        // 创建请求体
        var requestBody = new
        {
            model = "deepseek-chat",
            messages = new[]
            {
                new { role = "user", content = userMessage }
            },
        };

        string jsonBody = JsonConvert.SerializeObject(requestBody);
        // 创建UnityWebRequest
        UnityWebRequest request = new UnityWebRequest(apiUrl, "POST");
        byte[] bodyRaw = Encoding.UTF8.GetBytes(jsonBody);

        request.uploadHandler = new UploadHandlerRaw(bodyRaw);
        request.downloadHandler = new DownloadHandlerBuffer();
        request.SetRequestHeader("Content-Type", "application/json");
        request.SetRequestHeader("Authorization", "Bearer " + apiKey);

        // 发送请求
        yield return request.SendWebRequest();

        if (request.result == UnityWebRequest.Result.ConnectionError || request.result == UnityWebRequest.Result.ProtocolError)
        {
            Debug.LogError("Error: " + request.error); //打印错误详情
        }
        else
        {
            // 解析响应
            string responseJson = request.downloadHandler.text;
            var response = JsonUtility.FromJson<DeepSeekResponse>(responseJson);
            Debug.Log("DeepSeek: " + response.choices[0].message.content);

            //用户的提问
            //chatText.text += "\nUser: " + userMessage;

            // 返回的回答
            if (isFirst)
                chatText.text += "DeepSeek: " + response.choices[0].message.content;
            else
                chatText.text += "\nDeepSeek: " + response.choices[0].message.content;

            isFirst = false;
        }
    }
}

[System.Serializable]
public class DeepSeekResponse
{
    public Choice[] choices;
}

[System.Serializable]
public class Choice
{
    public Message message;
}

[System.Serializable]
public class Message
{
    public string role;
    public string content;
}

4.启动Unity

启动引擎看看效果如何，等待的过程还是有点久的，可能要几十秒，这主要是因为最近DeepSeek热度太高，请求也大，官方做出了一定的限制