结构大修改，改成朴实无华的结构，不过度架构。能跑就行

Assets/Plugins/FairyGUI/Scripts/UI/IUISource.cs

@@ -0,0 +1,36 @@
+
+namespace FairyGUI
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    public delegate void UILoadCallback();
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public interface IUISource
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        string fileName { get; set; }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        bool loaded { get; }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="callback"></param>
+        void Load(UILoadCallback callback);
+
+        /// <summary>
+        /// 取消加载
+        /// </summary>
+        void Cancel();
+        
+    }
+}