优化一些动画效果

Signed-off-by: TRADER_FOER <lhf190@outlook.com>

Assets/Scripts/UI/SongSelection/SongSelectionUIPage.cs

@@ -16,10 +16,10 @@ namespace Ichni.Menu
 
         [Tooltip("从选曲页进入当前章节剧情树的按钮。会优先定位当前选中歌曲对应的 SongBlock；未找到时显示剧情开头。")]
         public Button enterStoryButton;
-        
+
         public Gradient2 backgroundFrames;
         public float framePositionOffset = -1;
-        
+
         public SongListControllerUI songListController;
         public PlaySongUI playSongUI;
         public SongInfoUI songInfoUI;
@@ -47,12 +47,12 @@ namespace Ichni.Menu
                 MenuInputManager.OnMoveUp += songListController.GoToFormerTab;
                 MenuInputManager.OnMoveDown += songListController.GoToNextTab;
             };
-            
+
             backButton.onClick.AddListener(ReturnToChapterSelection);
 
             if (enterStoryButton != null)
                 enterStoryButton.onClick.AddListener(OpenStoryForSelectedSong);
-            
+
             songInfoUI.SetUp();
         }
 
@@ -93,10 +93,10 @@ namespace Ichni.Menu
         private void Start()
         {
             Sequence framesSeq = DOTween.Sequence();
-            framesSeq.Append(DOTween.To(() => framePositionOffset, x => framePositionOffset = x, 1f, 1f)
+            framesSeq.Append(DOTween.To(() => framePositionOffset, x => framePositionOffset = x, 1f, 3f)
                     .SetEase(Ease.Linear)
                     .OnUpdate(() => backgroundFrames.Offset = framePositionOffset));
-            framesSeq.AppendInterval(4f);
+            framesSeq.AppendInterval(1f);
             framesSeq.SetLoops(-1, LoopType.Restart);
             framesSeq.Play();
         }