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/Examples/PullToRefresh/ScrollPaneHeader.cs

@@ -0,0 +1,34 @@
+using FairyGUI;
+using UnityEngine;
+
+public class ScrollPaneHeader : GComponent
+{
+    Controller _c1;
+
+    public override void ConstructFromXML(FairyGUI.Utils.XML xml)
+    {
+        base.ConstructFromXML(xml);
+
+        _c1 = this.GetController("c1");
+
+        this.onSizeChanged.Add(OnSizeChanged);
+    }
+
+    void OnSizeChanged()
+    {
+        if (_c1.selectedIndex == 2 || _c1.selectedIndex == 3)
+            return;
+
+        if (this.height > this.sourceHeight)
+            _c1.selectedIndex = 1;
+        else
+            _c1.selectedIndex = 0;
+    }
+
+    public bool ReadyToRefresh => _c1.selectedIndex == 1;
+
+    public void SetRefreshStatus(int value)
+    {
+        _c1.selectedIndex = value;
+    }
+}