0.2版本，重构代码，增加Editor

Scripts/Editor/BarChartEditor.cs

@@ -0,0 +1,31 @@
+using UnityEditor;
+
+namespace XCharts
+{
+    /// <summary>
+    /// Editor class used to edit UI BarChart.
+    /// </summary>
+
+    [CustomEditor(typeof(BarChart), false)]
+    public class BarChartEditor : CoordinateChartEditor
+    {
+        protected SerializedProperty m_Bar;
+
+        protected override void OnEnable()
+        {
+            base.OnEnable();
+            m_Target = (BarChart)target;
+            m_Bar = serializedObject.FindProperty("m_Bar");
+        }
+
+        protected override void OnEndInspectorGUI()
+        {
+            base.OnEndInspectorGUI();
+            if (m_Target == null && target == null)
+            {
+                return;
+            }
+            EditorGUILayout.PropertyField(m_Bar, true);
+        }
+    }
+}