使用DoTween重构淡变效果

Assets/Scripts/OCES/Audio/HandWritten/LongAudio/ChannelFader.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
+using DG.Tweening;
 
 namespace OCES.Audio
 {
@@ -106,39 +107,64 @@ namespace OCES.Audio
             {
                 if (handle.Cancelled) break;
                 elapsed += Time.deltaTime;
-                float t = Mathf.Clamp01(elapsed / duration);
-                float vol = Mathf.Lerp(fromVolume, 0f, t);
+                // 为每个 source 创建 DOFade（仅创建一次）
+                sources.Clear();
+                handle.CollectActiveSources(sources);
+
                 foreach (AudioSource src in sources)
-                    if (src) src.volume = vol;
+                {
+                    if (!src) continue;
+
+                    if (DOTween.IsTweening(src))
+                        continue;
+
+                    src.volume = fromVolume;
+                    src.DOFade(0f, duration - elapsed).SetEase(Ease.Linear);
+                }
                 yield return null;
             }
 
+            // 确保最终状态
+            sources.Clear();
+            handle.CollectActiveSources(sources);
+            foreach (AudioSource src in sources)
+                if (src) src.volume = 0f;
+
             StopHandle(handle);
         }
 
         IEnumerator FadeIn(ContainerPlayHandle handle, float duration)
         {
-            //Debug.Log($"Fading In {duration} seconds.");
             if (handle == null || handle.Cancelled) yield break;
 
-            float elapsed = 0f;
             List<AudioSource> sources = new();
+            float elapsed = 0f;
 
             while (elapsed < duration)
             {
                 if (handle.Cancelled) yield break;
-                elapsed += Time.deltaTime;
-                float t = Mathf.Clamp01(elapsed / duration);
 
-                // 每帧重新收集（Blend 模式下新 source 可能中途加入）
+                elapsed += Time.deltaTime;
+
+                // 每帧收集当前活跃的 sources，并为新加入的 source 创建 tween
                 sources.Clear();
                 handle.CollectActiveSources(sources);
+
                 foreach (AudioSource src in sources)
-                    if (src) src.volume = Mathf.Lerp(0f, 1f, t);
+                {
+                    if (!src) continue;
+
+                    // 如果这个 source 还没被 tween 过，则创建一个 DOFade
+                    if (DOTween.IsTweening(src))
+                        continue;
+                    src.volume = 0f;
+                    src.DOFade(1f, duration - elapsed).SetEase(Ease.Linear);
+                }
+
                 yield return null;
             }
 
-            // 确保最终音量准确
+            // 确保最终音量
             sources.Clear();
             handle.CollectActiveSources(sources);
             foreach (AudioSource src in sources)