处理滚动底部问题

keyBoard/Class/AiTalk/VC/KBAIHomeVC.m

@@ -647,6 +647,12 @@
     unsigned long long fileSize = [attributes[NSFileSize] unsignedLongLongValue];
     NSLog(@"[KBAIHomeVC] 录音完成，时长: %.2fs，大小: %llu bytes", duration, fileSize);
     
+    // 显示 loading 气泡
+    KBPersonaChatCell *currentCell = [self currentPersonaCell];
+    if (currentCell) {
+        [currentCell appendLoadingUserMessage];
+    }
+    
     __weak typeof(self) weakSelf = self;
     [self.aiVM transcribeAudioFileAtURL:fileURL
                              completion:^(KBAiSpeechTranscribeResponse * _Nullable response, NSError * _Nullable error) {
@@ -656,9 +662,14 @@
         }
         
         dispatch_async(dispatch_get_main_queue(), ^{
+            KBPersonaChatCell *cell = [strongSelf currentPersonaCell];
+            
             if (error) {
                 NSLog(@"[KBAIHomeVC] 语音转文字失败：%@", error.localizedDescription);
                 [KBHUD showError:KBLocalized(@"语音转文字失败，请重试")];
+                if (cell) {
+                    [cell updateLastUserMessage:KBLocalized(@"语音识别失败")];
+                }
                 return;
             }
             
@@ -666,10 +677,19 @@
             if (transcript.length == 0) {
                 NSLog(@"[KBAIHomeVC] 语音转文字结果为空");
                 [KBHUD showError:KBLocalized(@"未识别到语音内容")];
+                if (cell) {
+                    [cell updateLastUserMessage:KBLocalized(@"未识别到语音")];
+                }
                 return;
             }
             
-            [strongSelf handleTranscribedText:transcript];
+            // 更新 loading 气泡为实际文本
+            if (cell) {
+                [cell updateLastUserMessage:transcript];
+            }
+            
+            // 发送聊天请求（不追加消息，因为已经更新了）
+            [strongSelf handleTranscribedText:transcript appendToUI:NO];
         });
     }];
 }
@@ -687,6 +707,10 @@
 #pragma mark - Private
 
 - (void)handleTranscribedText:(NSString *)text {
+    [self handleTranscribedText:text appendToUI:YES];
+}
+
+- (void)handleTranscribedText:(NSString *)text appendToUI:(BOOL)appendToUI {
     if (text.length == 0) {
         return;
     }
@@ -699,7 +723,7 @@
     }
     
     KBPersonaChatCell *currentCell = [self currentPersonaCell];
-    if (currentCell) {
+    if (currentCell && appendToUI) {
         [currentCell appendUserMessage:text];
     }
     
@@ -722,6 +746,12 @@
             strongSelf.isWaitingForAIResponse = NO;
             strongSelf.collectionView.scrollEnabled = YES;
             NSLog(@"[KBAIHomeVC] AI 回复完成，恢复 CollectionView 滚动");
+
+            // 收到响应后，隐藏用户消息的 loading
+            KBPersonaChatCell *cell = [strongSelf currentPersonaCell];
+            if (cell) {
+                [cell markLastUserMessageLoadingComplete];
+            }
             
             if (response.code == 50030) {
                 NSString *message = response.message ?: @"";
@@ -745,7 +775,6 @@
                 return;
             }
             
-            KBPersonaChatCell *cell = [strongSelf currentPersonaCell];
             if (cell) {
                 [cell appendAssistantMessage:aiResponse audioId:audioId];
             }