yichael_smartbow/Assets/BowArrow/Scripts/Network/HttpController/CaptchaController.cs

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

/* Http控制器-验证码 */
public class CaptchaController : JCUnityLib.Singleton<CaptchaController>
{
    int[] builtInCaptchaList = {3825, 4472, 9483};

    public IEnumerator GetCaptcha(Image targetRenderImage, Action<int> cb)
    {
        if (targetRenderImage.sprite == null) {
            int codeA = builtInCaptchaList[UnityEngine.Random.Range(0, 3)];
            targetRenderImage.sprite = Resources.Load<Sprite>("Captcha/" + codeA);
            if (cb != null) cb(codeA);
        }
        int code = UnityEngine.Random.Range(1000, 10000);
        using (UnityWebRequest uwr = new UnityWebRequest(CommonConfig.gateServerURL + "/api/createCaptcha?code=" + code, UnityWebRequest.kHttpVerbGET)) {
            uwr.downloadHandler = new DownloadHandlerTexture();
            yield return uwr.SendWebRequest();
            Texture2D texture = DownloadHandlerTexture.GetContent(uwr);
            Sprite sprite = Sprite.Create(texture, new Rect(0, 0, texture.width, texture.height), new Vector2(0.5f, 0.5f));
            targetRenderImage.sprite = sprite;
            if (cb != null) cb(code);
        }
    }
}