无法访问分析查询列表项

本文关键字：查询 列表 访问 | 更新日期: 2023-09-27 18:22:15

我正在使用Unity和Parse开发一个应用程序。该应用程序拍摄一张照片，上传到Parse，然后第二个功能应该检索所有上传的照片并显示相关数据。

我的问题是：

我正在运行一个Parse查询，从Parse中获取所有当前上传的项目，并通过objectId将它们添加到列表中。我可以在Unity的Inspector中看到objectId正在添加到列表中，但查询一结束，列表项就返回null。

理想情况下，我的意图是为列表中的每个项目创建一个新的Unity UI对象，并用从Parse检索到的数据填充每个项目中的文本字段。

以下是我目前正在使用的代码：

using UnityEngine;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Threading.Tasks;
using Parse;
public class RetrieveAllObjects : MonoBehaviour
{
    public RectTransform InfoCell;
    public float Vec3x;
    public float Vec3y;
    public List<string>AllObjectIds = new List<string> ();
    string objectId;
    DateTime? createdAt;
    IEnumerable<ParseObject> results;
    // Use this for initialization
    void Start ()
    {
        var query = ParseObject.GetQuery ("Snapshot")
            .OrderByDescending("createdAt");
        query.FindAsync ().ContinueWith (u =>
        {
            results = u.Result;
            foreach (var result in results) {
                objectId = result.ObjectId;
                createdAt = result.CreatedAt;
                print ("Object ID: " + objectId + "'n" + "Date Created: " + createdAt);
                AllObjectIds.Add (objectId);
            }
            return AllObjectIds;
        });
        foreach (string id in AllObjectIds) {
            CreateInfoCell ();
        }
    }
    void CreateInfoCell ()
    {
            RectTransform newCell = Instantiate (InfoCell);
            newCell.transform.SetParent (this.gameObject.transform);
            newCell.transform.localScale = new Vector3 (1, 1, 1);
            Vec3y = Vec3y - 50;
    }
    // Update is called once per frame
    void Update ()
    {
    }
}

无法访问分析查询列表项

我能够通过使用IE分子来解决这个问题。

以下代码：

using UnityEngine;
using UnityEngine.UI;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Threading.Tasks;
using Parse;
public class RetrieveAllObjects : MonoBehaviour
{
    public RectTransform InfoCell;
    public Text IdText;
    public Text DateText;
    public float Vec3x;
    public float Vec3y;
    public List<string>AllObjectIds = new List<string> ();
    public List<string>CreatedAtDates = new List<string> ();
    public GameObject AnchorPos;
    int num;
    string objectId;
    DateTime? createdAt;
    IEnumerable<ParseObject> results;
    // Use this for initialization
    void Start ()
    {
        var query = ParseObject.GetQuery ("Snapshot")
            .OrderByDescending("createdAt");
        query.FindAsync ().ContinueWith (u =>
        {
            results = u.Result;
            foreach (var result in results) {
                objectId = result.ObjectId;
                createdAt = result.CreatedAt;
                // print ("Object ID: " + objectId + "'n" + "Date Created: " + createdAt);
                AllObjectIds.Add (objectId);
                CreatedAtDates.Add (createdAt.ToString());
            }
            foreach (string id in AllObjectIds) {
                // CreateInfoCell ();
                // print (id);
            }
            foreach (string date in CreatedAtDates) {
                // CreateInfoCell ();
                // print (date);
            }
            return AllObjectIds;
            return CreatedAtDates;
        });
        StartCoroutine (UpdateUI ());
    }
    IEnumerator UpdateUI () {
        yield return new WaitForSeconds(1);
        var query = ParseObject.GetQuery ("Snapshot");
        Task task = query.FindAsync ();
        while(!task.IsCompleted) yield return null;
        // Do all your continue with stuff here
        foreach (string id in AllObjectIds) {
            CreateInfoCell (id);
        }
        AnchorPos.SetActive (false);
    }
    void CreateInfoCell (string id)
    {
            // print ("CELL CREATED'n");
            RectTransform newCell = Instantiate (InfoCell);
            newCell.name = id + " - " + CreatedAtDates[num];
            GameObject PutIdText = GameObject.Find(newCell.name + "/ObjectIdText");
            PutIdText.GetComponent<Text> ().text = id;
            GameObject PutDateText = GameObject.Find(newCell.name + "/DateCreatedText");
            PutDateText.GetComponent<Text> ().text = CreatedAtDates[num];
        StartCoroutine (DisplayThumbnail(newCell, id));
            // IdText.text = id;
            // DateText.text = CreatedAtDates[num];
            num++;
            newCell.transform.SetParent (this.gameObject.transform);
            newCell.transform.localScale = new Vector3 (1, 1, 1);
        newCell.transform.position = new Vector3 (AnchorPos.transform.position.x, AnchorPos.transform.position.y - Vec3y, AnchorPos.transform.position.z);
            Vec3y = Vec3y + 100;
    }
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