Unity干中学——如何实现类似Windows Store 应用程序和Android Toast的通知？

要实现通知中心功能，首先要创建一个游戏物体，在上面挂载GUITeture和GUIText脚本。注意GUITexture和GUIText脚本的顺序，GUITexture在前，GUIText在后，否则GUITexture会将GUIText遮挡住。

接着设置Position属性，讲Position的X属性设置为1.2，Y设置为0.9，这样就将物体设置为屏幕之外靠近右上角的位置。

下面给物体挂载脚本，实现通知功能。

 using UnityEngine;
 using System.Collections;
 
 public class TestTest : MonoBehaviour
 {
     private GUITexture guiTexture;
     private GUIText guiText;
     private float x;
     private bool sholdMove = true;
     private bool shouldFadeOut = true;
     public float stopMoveTime = ;
     public bool shouldPlay = true;
     private float winStoreNotificationCenterStayTime = 3f;
     private float androidToastStayTime = 0.5f;
     public enum NotificationStyle { AndroidToast, WinStoreNotificationCenter };
 
     public NotificationStyle currentNotificationStyle = NotificationStyle.WinStoreNotificationCenter;
     void Start()
     {
         guiTexture = GetComponent<GUITexture>();
         guiText = GetComponent<GUIText>();
 
         audio.PlayDelayed(0.5f);
 
         switch (currentNotificationStyle)
         {
             case NotificationStyle.AndroidToast:
 
                 Vector3 pos = guiTexture.gameObject.transform.position;
                 pos.x = 0.5f - (guiTexture.pixelInset.size.x / Screen.width) * 0.5f;
                 pos.y = 0.5f + (guiTexture.pixelInset.size.y / Screen.height) * 0.5f;
                 guiTexture.gameObject.transform.position = pos;
                 guiText.alignment = TextAlignment.Center;
 
                 shouldFadeOut = true;
 
                 break;
 
             case NotificationStyle.WinStoreNotificationCenter:
 
                 x =  - (guiTexture.pixelInset.size.x / Screen.width) - 0.02f;
                 shouldFadeOut = false;
                 break;
             default:
 
                 break;
         }
 
     }
 
     // Update is called once per frame
     void Update()
     {
         switch (currentNotificationStyle)
         {
             case NotificationStyle.AndroidToast:
 
                 if (stopMoveTime !=  && stopMoveTime + androidToastStayTime <= Time.time)
                 {
                     shouldFadeOut = true;
                 }
 
                 if (shouldFadeOut)
                 {
                     Color temp = guiTexture.color;
                     temp.a -= Time.deltaTime / 2f;
                     guiTexture.color = temp;
                     if (guiTexture.color.a <= )
                     {
                         shouldFadeOut = false;
                         Destroy(this.gameObject);
                     }
                 }
 
                 break;
             case NotificationStyle.WinStoreNotificationCenter:
 
                 if (sholdMove)
                 {
                     guiTexture.transform.Translate(new Vector3(-0.1f, , ) * Time.deltaTime * );
                     if (guiTexture.transform.position.x <= x)
                     {
                         sholdMove = false;
                         stopMoveTime = Time.time;
                     }
                 }
 
                 if (stopMoveTime !=  && stopMoveTime + winStoreNotificationCenterStayTime <= Time.time)
                 {
                     shouldFadeOut = true;
                 }
 
                 if (shouldFadeOut)
                 {
                     Color temp = guiTexture.color;
                     temp.a -= Time.deltaTime;
                     guiTexture.color = temp;
                     if (guiTexture.color.a <= )
                     {
                         shouldFadeOut = false;
                         Destroy(this.gameObject);
                     }
                 }
 
                 break;
 
             default:
                 break;
         }
     }
 }

然后给游戏物体加上Audio Source组件，由于播放消息声音。接下来将物体命名为Notification，做成Prefab。最终结果如下图所示：

下面写一个Notification脚本，用于统一管理通知。

 using UnityEngine;
 using System.Collections;
 
 public class NotificationCenter : MonoBehaviour
 {
     public static NotificationCenter Instance;
 
     public GameObject notificationPrefab;
     void Awake()
     {
         Instance = this;
     }
 
     public void Add(TestTest.NotificationStyle notificationStyle, string guiTextContent)
     {
         GameObject go = Instantiate(notificationPrefab) as GameObject;
         go.GetComponent<TestTest>().currentNotificationStyle = notificationStyle;
         go.guiText.text = guiTextContent;
     }
 }

这样，当我们使用的时候直接调用NotificationCenter.Instance. Add(TestTest.NotificationStyle notificationStyle, string guiTextContent)

方法就行了。其中notificationStyle参数表示消息现实的风格（WinStore样式或Android Toast样式），guiTextContent表示GUIText组件现实的文本，也就是消息内容。

接着我的上一篇文章，要想显示截图保存成功的消息，只需要这样调用NotificationCenter.Instance. Add(TestTest.NotificationStyle.WinStoreNotificationCenter, "成功截图并保存")。