【UI】更新初始化时，面板打开的UI逻辑；

UpmGitTool/Assets/Scritps/UI/Controller/UICtrl_ToggleGroup.cs

@@ -35,6 +35,13 @@ namespace UpmGitTool.UI
 
         private void Start()
         {
+            int length = ListToggles.Count;
+            for (int i = 0; i < length; i++)
+            {
+                var toggle = ListToggles[i];
+                toggle.isOn = i == ActiveIndex;
+            }
+
             foreach (Toggle toggle in ListToggles)
             {
                 toggle.onValueChanged.AddListener(OnToggleVauleChanged);

UpmGitTool/Assets/Scritps/UI/MainWindow.cs

@@ -31,6 +31,9 @@ namespace UpmGitTool.UI
         {
             GYEventsCenter.RegisterEventMsg(Lib.ON_LOADED_UNITY_PROJECT, OnLoadedUnityProject);
             GYEventsCenter.RegisterEventMsg(Lib.ON_PACKAGE_DATA_REFRESH, OnPackageDataRefresh);
+            //显示详情页；
+            OnInfoToggleChange(toggleGroup_Info.ActiveIndex);
+            SelectPackage(null);
         }
 
         protected override void OnClose()
@@ -71,7 +74,14 @@ namespace UpmGitTool.UI
 
         public void SelectPackage(UPackage package)
         {
-            if (package == null) return;
+            if (package == null)
+            {
+                LabelName.SetText("请选择一个 Package 包");
+                LabelVersion.gameObject.SetActive(false);
+                DetailViewObj.SetActive(false);
+                GitFetchView.gameObject.SetActive(false);
+                return;
+            }
             Logger.Log($"设置显示：{package.PackageName}");
             LabelName.SetText(package.PackageName);
             LabelVersion.gameObject.SetActive(package.IsInstalled);