工具栏问题修改，中文

Assets/Scripts/Scenes/MainController.cs

@@ -391,11 +391,20 @@ public class MainController : BaseScene
     float emptyt = 0;//用于无消息计时
     float t = 1f;
     float scanTicks = 0;
+    float clearcachet = 30;
     // Update is called once per frame
     protected override void Update()
     {
         base.Update();
-        
+
+        clearcachet -= Time.deltaTime;
+        if (clearcachet <= 0) 
+        {
+            Debug.Log("清一次");
+            Resources.UnloadUnusedAssets();
+            GC.Collect();
+            clearcachet = 30;
+        }
         if (App.canvasWidth != transform.GetComponent<RectTransform>().sizeDelta.x) 
         {
             App.canvasWidth = transform.GetComponent<RectTransform>().sizeDelta.x;