如何从 url 获取图像并将其设置为 Unity 中的对象

Question

我有一种从预制件创建对象的方法。预制件由文本“标题”和“描述”以及图像“图像”组成。

在下面的方法中，我得到“标题”、“描述”的文本和“图像”的图像 URL。

using System.Collections;
using UnityEngine;
using UnityEngine.UI;
using Newtonsoft.Json.Linq;

using System.Threading.Tasks;
using UnityEngine.Networking;

public class CreateMonumentButtons : MonoBehaviour
{
    public RectTransform prefarb;
    public RectTransform content;

    private string City;
    private string URL = DataHolders.URL;

    async private void Awake()
    {
        City = DataHolders.City;
        StartCoroutine(Get());
    }

    void InitializeItemView (GameObject viewGameObject, string TextTitle, string TextDescription, string URLImg)
    {
        TestItemView view = new TestItemView(viewGameObject.transform);
        view.Title.text = TextTitle;
        view.Description.text = TextDescription;

        File fileData;
        Texture2d txture;
        (File.Exists(URLImg))     {
            fileData = File.ReadAllBytes(URLImg); //read the bytes from the file at URLImg's destination
            txture = new Texture2D(0,0);//makes the new texture
            txture.LoadImage(fileData);//loads the image from the file
            view.Img.sprite = Sprite.Create(txture, new Rect(0,0,200,200), new Vector2());
            //set Img.sprite to a new sprite at 0,0 with the dimensions 200x200
        }
    }

    public class TestItemView
    {
        public Text Title;
        public Text Description;
        // public Image Image;

        public TestItemView (Transform rootView)
        {
            Title = rootView.Find("Title").GetComponent<Text>();
            Description = rootView.Find("Description").GetComponent<Text>();
            // Image = rootView.Find("Image").GetComponent<Image>();
        }
    }

    private IEnumerator Get()
    {
        WWWForm formT = new WWWForm();

        formT.AddField("City", City);

        WWW wwwT = new WWW(URL + "get_monuments.php", formT);
        yield return wwwT;
        if (wwwT.error != null)
        {
            Debug.Log("Ошибка: " + wwwT.error);
            yield break;
        }

        WWWForm formD = new WWWForm();

        formD.AddField("City", City);

        WWW wwwD = new WWW(URL + "get_description.php", formD);
        yield return wwwD;
        if (wwwD.error != null)
        {
            Debug.Log("Ошибка: " + wwwD.error);
            yield break;
        }

        WWWForm formI = new WWWForm();

        formI.AddField("City", City);

        WWW wwwI = new WWW(URL + "get_img.php", formI);
        yield return wwwI;
        if (wwwI.error != null)
        {
            Debug.Log("Ошибка: " + wwwI.error);
            yield break;
        }

        WWWForm formL = new WWWForm();

        formL.AddField("City", City);

        WWW wwwL = new WWW(URL + "get_lenLists.php", formL);
        yield return wwwL;
        if (wwwL.error != null)
        {
            Debug.Log("Ошибка: " + wwwL.error);
            yield break;
        }

        DataHolders.listLen = int.Parse(wwwL.text);
        DataHolders.listImg = wwwI.text;
        DataHolders.listDescription = wwwD.text;  
        DataHolders.listMonuments = wwwT.text; 

        var ListTitls = JObject.Parse(DataHolders.listMonuments);
        var ListDescriptions = JObject.Parse(DataHolders.listDescription);
        var ListImgs = JObject.Parse(DataHolders.listImg);

        for( int i = 0; i < DataHolders.listLen; i++ )
        {
            // Debug.Log(i.ToString());
            var Title = (string) ListTitls[i.ToString()];
            var Description = (string) ListDescriptions[i.ToString()];
            var Img = (string) ListImgs[i.ToString()];

            var instance = GameObject.Instantiate(prefarb.gameObject) as GameObject;
            instance.transform.SetParent(content, false);
            InitializeItemView(instance, Title, Description, Img);
        }      
    }
}

我不明白如何从图片网址获取图片并将其值设置为“图片”。

但我是初学者，所以最好用简单的语言解释一下。

Answer 1

Unity Beginner 已在 1.5 分钟内向Load Image from WebLink or URL 轻松解释。

但在这里，他们使用了已过时的 WWW，因此请改用 UnityWebRequest。 Here 是您在从 WWW 更改为 UnityWebRequest 时需要执行的更改。

Answer 2

图片没有Text属性，取而代之，你应该获取文件，将图片加载到纹理，并将图片的精灵设置为纹理。

File fileData;
Texture2d txture;
if (File.Exists(URLImg))     {
         fileData = File.ReadAllBytes(URLImg); //read the bytes from the file at URLImg's destination
         txture = new Texture2D(0,0);//makes the new texture
         txture.LoadImage(fileData);//loads the image from the file
         view.Img.sprite = Sprite.Create(txture, new Rect(0,0,200,200), new Vector2());
         //set Img.sprite to a new sprite at 0,0 with the dimensions 200x200
     }

将view.Img.sprite 用作图像而不是“文本”，因为它不是在绘制文本，而是在绘制图像。