Unity中的Coroutine（协程）

估计熟悉Unity的人看过或者用过StartCoroutine()

假设我们在场景中有一个UGUI组件， Image：

将以下代码绑定到Image

 1 using UnityEngine;
 2 using System.Collections;
 3 using System.Threading;
 4 using UnityEngine.UI;
 5
 6 public class CoroutineDemo : MonoBehaviour {
 7
 8     // Use this for initialization
 9     void Start () {
10
11         Debug.Log (Thread.CurrentThread.Name + ": Start begin. fCount=" +  + Time.renderedFrameCount);
12
13
14         this.StartCoroutine (exeuteCoroutine());
15     }
16
17     // Update is called once per frame
18     void Update () {
19
20         Debug.Log (Thread.CurrentThread.Name + ": Update(): fCount=" + Time.renderedFrameCount);
21     }
22
23
24     public IEnumerator exeuteCoroutine(){
25         Debug.Log (Thread.CurrentThread.Name + ": Before yield return A, fCount=" + Time.renderedFrameCount);
26         //yield return new WaitForSeconds(1);
27         yield return "A";
28 //        yield return "C";
29 //        yield return "D";
30         Debug.LogError (Thread.CurrentThread.Name + ": After yield return A, fCount=" + Time.renderedFrameCount);
31     }
32
33     IEnumerator LoadImage()
34     {
35         WWW www=new WWW("http://pic89.nipic.com/file/20160211/22571617_214730734684_2.jpg");
36         Image img = this.gameObject.GetComponent<Image> ();
37
38         Debug.Log("Before yield return: " + www.url + " is done? " + www.isDone + ", rf=" + Time.renderedFrameCount);
39
40         yield return www;
41
42         Debug.Log("After yield return, " + www.url + " is done? " + www.isDone + ", rf=" + Time.renderedFrameCount);
43         Rect spriteRect = new Rect (0, 0, www.texture.width, www.texture.height);
44         Sprite imageSprite = Sprite.Create (www.texture, spriteRect, new Vector2 (0.5f, 0.5f));
45         img.sprite = imageSprite;
46
47     }
48 }

运行之后日志输出：