c# - Unity如何使用从json字符串加载的变量作为更新部分的输入

Question

一般来说，我对 Unity 和 C# 编码还很陌生，所以我的问题对你们中的一些人来说可能很愚蠢，但我目前正在尝试在其坐标来自 json 字符串的位置创建一个按钮。我只是不知道从这里下一步该去哪里来实现我的目标。如何使用 json 中的 xcoor 作为更新的输入？这是我的代码:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.UI;
using SimpleJSON;

public class JSONcontroller : MonoBehaviour
{
    public GameObject obj;
    Vector3 buttonPos;
    private string url = "http://localhost:3000/coordinates/";

    // Start is called before the first frame update
    void Start()
    {
        StartCoroutine(getData());
        
    }

    IEnumerator getData()
    {
        UnityWebRequest request = UnityWebRequest.Get(url);
        yield return request.SendWebRequest();
        if(request.isNetworkError||request.isHttpError)
        {
            Debug.LogError(request.error);
            yield break;
        }
        JSONNode coordinates = JSON.Parse(request.downloadHandler.text);
        string xcoor = coordinates["x1"];
        string ycoor = coordinates["y1"];
        //Debug.Log(xcoor);


    }

    // Update is called once per frame
    void Update()
    {
        buttonPos = new Vector3(xcoor, ycoor, 4f);
        if (Input.GetButton("Fire1"))
            Instantiate(obj, buttonPos, Quaternion.identity);
    }
}

和我的示例 json 文件

{
  "coordinates": [
    {
      "id": 1,
      "x1": "5",
      "y1": "2"
    },
    {
      "id": 2,
      "x1": "3",
      "y1": "5"
    },
    {
      "id": 3,
      "x1": "5",
      "y1": "7"
    }
  ]
}

Answer 1

您的“xcoor”和“ycoor”变量实际上是在您的 getData() 方法中声明的，这意味着这些变量只能在方法 getData() 中使用。

您可以在类的顶部声明它们，然后您就可以在更新中使用变量并设置按钮位置。

编辑代码:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.UI;
using SimpleJSON;

public class JSONcontroller : MonoBehaviour
{
    public GameObject obj;
    Vector3 buttonPos;
    private string url = "http://localhost:3000/coordinates/";
    string xcoor;
    string ycoor;

    // Start is called before the first frame update
    void Start()
    {
        StartCoroutine(getData());
        
    }

    IEnumerator getData()
    {
        UnityWebRequest request = UnityWebRequest.Get(url);
        yield return request.SendWebRequest();
        if(request.isNetworkError||request.isHttpError)
        {
            Debug.LogError(request.error);
            yield break;
        }
        JSONNode coordinates = JSON.Parse(request.downloadHandler.text);
        xcoor = coordinates["x1"];
        coor = coordinates["y1"];
        //Debug.Log(xcoor);


    }

    // Update is called once per frame
    void Update()
    {
        buttonPos = new Vector3(xcoor, ycoor, 4f);
        if (Input.GetButton("Fire1"))
            Instantiate(obj, buttonPos, Quaternion.identity);
    }
}