fix: show_large_sprite闪烁问题

Assets/Scripts/SceneManagement/SpriteShowcase.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections;
 using AibisDream.Framework;
 using AibisDream.Kit;
@@ -89,6 +89,7 @@ namespace AibisDream
             if (_spriteRenderer == null) yield break;
             _spriteRenderer.DOKill();
             _spriteRenderer.gameObject.SetActive(true);
+            if (!CommonUtil.IsZero(duration)) _spriteRenderer.SetAlpha(0f);
 
             var loaded = false;
             yield return LoadDreamSpriteInto(_spriteRenderer, picName, value => loaded = value);
@@ -115,7 +116,7 @@ namespace AibisDream
             if (_largeSpriteRenderer == null) yield break;
             _largeSpriteRenderer.DOKill();
             _largeSpriteRenderer.gameObject.SetActive(true);
-            _largeSpriteRenderer.SetAlpha(0f);
+            if (!CommonUtil.IsZero(duration)) _largeSpriteRenderer.SetAlpha(0f);
 
             var loaded = false;
             yield return LoadDreamSpriteInto(_largeSpriteRenderer, picName, value => loaded = value);
@@ -126,7 +127,7 @@ namespace AibisDream
             }
 
             _currentLargePicName = NormalizeDreamPicName(picName);
-            if (duration <= 0f)
+            if (CommonUtil.IsZero(duration))
                 _largeSpriteRenderer.SetAlpha(1f);
             else
                 yield return _largeSpriteRenderer.DOFade(1f, duration).WaitForCompletion();