tableview倒置

keyBoard/Class/AiTalk/V/Chat/KBPersonaChatCell.m

@@ -260,7 +260,7 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     __weak typeof(self) weakSelf = self;
     [self.aiVM fetchChatHistoryWithCompanionId:companionId
                                         pageNum:self.currentPage
-                                       pageSize:20
+                                       pageSize:10
                                      completion:^(KBChatHistoryPageModel *pageModel, NSError *error) {
         __strong typeof(weakSelf) strongSelf = weakSelf;
         if (!strongSelf) {
@@ -304,8 +304,8 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
             
             message.isComplete = YES;
             message.needsTypewriterEffect = NO;
-//            [newMessages addObject:message];
-            [newMessages insertObject:message atIndex:0];
+            [newMessages addObject:message];
+//            [newMessages insertObject:message atIndex:0];
         }
         
         // 插入历史消息（确保开场白始终是第一条）
@@ -317,12 +317,19 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
             strongSelf.messages = newMessages;
             [strongSelf ensureOpeningMessageAtTop];
         } else {
-            // 后续页，插入到开场白之后
+            // 后续页，继续加载历史
             [strongSelf ensureOpeningMessageAtTop];
             if (newMessages.count > 0) {
-                NSUInteger insertIndex = [strongSelf hasOpeningMessageAtTop] ? 1 : 0;
-                NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(insertIndex, newMessages.count)];
-                [strongSelf.messages insertObjects:newMessages atIndexes:indexSet];
+                if (strongSelf.chatView.inverted) {
+                    NSInteger openingIndex = [strongSelf openingMessageIndexInMessages];
+                    NSUInteger insertIndex = (openingIndex != NSNotFound) ? (NSUInteger)openingIndex : strongSelf.messages.count;
+                    NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(insertIndex, newMessages.count)];
+                    [strongSelf.messages insertObjects:newMessages atIndexes:indexSet];
+                } else {
+                    NSUInteger insertIndex = [strongSelf hasOpeningMessageAtTop] ? 1 : 0;
+                    NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(insertIndex, newMessages.count)];
+                    [strongSelf.messages insertObjects:newMessages atIndexes:indexSet];
+                }
             }
         }
         
@@ -335,10 +342,16 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
                                              keepOffset:NO
                                         scrollToBottom:YES];
             } else {
-                NSLog(@"[KBPersonaChatCell] 刷新 UI - loadedPage: %ld, prependHistory", 
-                      (long)loadedPage);
-                KBAiChatMessage *openingMessage = [strongSelf hasOpeningMessageAtTop] ? strongSelf.messages.firstObject : nil;
-                [strongSelf.chatView prependHistoryMessages:newMessages openingMessage:openingMessage];
+                if (strongSelf.chatView.inverted) {
+                    NSLog(@"[KBPersonaChatCell] 刷新 UI - loadedPage: %ld, appendHistory", (long)loadedPage);
+                    KBAiChatMessage *openingMessage = [strongSelf openingMessageInMessages];
+                    [strongSelf.chatView appendHistoryMessages:newMessages openingMessage:openingMessage];
+                } else {
+                    NSLog(@"[KBPersonaChatCell] 刷新 UI - loadedPage: %ld, prependHistory",
+                          (long)loadedPage);
+                    KBAiChatMessage *openingMessage = [strongSelf hasOpeningMessageAtTop] ? strongSelf.messages.firstObject : nil;
+                    [strongSelf.chatView prependHistoryMessages:newMessages openingMessage:openingMessage];
+                }
             }
             [strongSelf.chatView endLoadMoreWithHasMoreData:strongSelf.hasMoreHistory];
             
@@ -381,6 +394,9 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     if (self.messages.count == 0) {
         return NO;
     }
+    if (self.chatView.inverted) {
+        return [self isOpeningMessage:self.messages.lastObject];
+    }
     return [self isOpeningMessage:self.messages.firstObject];
 }
 
@@ -409,7 +425,35 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     KBAiChatMessage *openingMsg = [KBAiChatMessage assistantMessageWithText:introText];
     openingMsg.isComplete = YES;
     openingMsg.needsTypewriterEffect = NO;
-    [self.messages insertObject:openingMsg atIndex:0];
+    if (self.chatView.inverted) {
+        [self.messages addObject:openingMsg];
+    } else {
+        [self.messages insertObject:openingMsg atIndex:0];
+    }
+}
+
+- (nullable KBAiChatMessage *)openingMessageInMessages {
+    NSInteger index = [self openingMessageIndexInMessages];
+    if (index == NSNotFound) {
+        return nil;
+    }
+    return self.messages[index];
+}
+
+- (NSInteger)openingMessageIndexInMessages {
+    NSString *introText = self.persona.introText ?: @"";
+    if (introText.length == 0 || self.messages.count == 0) {
+        return NSNotFound;
+    }
+    
+    if (self.chatView.inverted) {
+        NSInteger lastIndex = self.messages.count - 1;
+        KBAiChatMessage *msg = self.messages[lastIndex];
+        return [self isOpeningMessage:msg] ? lastIndex : NSNotFound;
+    }
+    
+    KBAiChatMessage *first = self.messages.firstObject;
+    return [self isOpeningMessage:first] ? 0 : NSNotFound;
 }
 
 #pragma mark - 通知处理
@@ -454,7 +498,11 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     
     [self ensureOpeningMessageAtTop];
     KBAiChatMessage *message = [KBAiChatMessage userMessageWithText:text];
-    [self.messages addObject:message];
+    if (self.chatView.inverted) {
+        [self.messages insertObject:message atIndex:0];
+    } else {
+        [self.messages addObject:message];
+    }
     [self.chatView addMessage:message autoScroll:YES];
 }
 
@@ -465,7 +513,11 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     
     [self ensureOpeningMessageAtTop];
     KBAiChatMessage *message = [KBAiChatMessage loadingUserMessage];
-    [self.messages addObject:message];
+    if (self.chatView.inverted) {
+        [self.messages insertObject:message atIndex:0];
+    } else {
+        [self.messages addObject:message];
+    }
     [self.chatView addMessage:message autoScroll:YES];
 }
 
@@ -473,13 +525,25 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     [self.chatView updateLastUserMessage:text];
     
     // 更新数据源中的消息
-    for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
-        KBAiChatMessage *message = self.messages[i];
-        if (message.type == KBAiChatMessageTypeUser && message.isLoading) {
-            message.text = text;
-            message.isLoading = NO;
-            message.isComplete = YES;
-            break;
+    if (self.chatView.inverted) {
+        for (NSInteger i = 0; i < self.messages.count; i++) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeUser && message.isLoading) {
+                message.text = text;
+                message.isLoading = NO;
+                message.isComplete = YES;
+                break;
+            }
+        }
+    } else {
+        for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeUser && message.isLoading) {
+                message.text = text;
+                message.isLoading = NO;
+                message.isComplete = YES;
+                break;
+            }
         }
     }
 }
@@ -488,11 +552,21 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     [self.chatView markLastUserMessageLoadingComplete];
 
     // 同步更新数据源
-    for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
-        KBAiChatMessage *message = self.messages[i];
-        if (message.type == KBAiChatMessageTypeUser && message.isLoading) {
-            message.isLoading = NO;
-            break;
+    if (self.chatView.inverted) {
+        for (NSInteger i = 0; i < self.messages.count; i++) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeUser && message.isLoading) {
+                message.isLoading = NO;
+                break;
+            }
+        }
+    } else {
+        for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeUser && message.isLoading) {
+                message.isLoading = NO;
+                break;
+            }
         }
     }
 }
@@ -515,7 +589,11 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     KBAiChatMessage *message = [KBAiChatMessage assistantMessageWithText:text
                                                                  audioId:audioId];
     message.needsTypewriterEffect = YES;
-    [self.messages addObject:message];
+    if (self.chatView.inverted) {
+        [self.messages insertObject:message atIndex:0];
+    } else {
+        [self.messages addObject:message];
+    }
     [self.chatView addMessage:message autoScroll:YES];
 }
 
@@ -527,18 +605,32 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     
     [self ensureOpeningMessageAtTop];
     KBAiChatMessage *message = [KBAiChatMessage loadingAssistantMessage];
-    [self.messages addObject:message];
+    if (self.chatView.inverted) {
+        [self.messages insertObject:message atIndex:0];
+    } else {
+        [self.messages addObject:message];
+    }
     [self.chatView addMessage:message autoScroll:YES];
 }
 
 /// 移除 loading AI 消息
 - (void)removeLoadingAssistantMessage {
     // 从数据源中移除
-    for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
-        KBAiChatMessage *message = self.messages[i];
-        if (message.type == KBAiChatMessageTypeAssistant && message.isLoading) {
-            [self.messages removeObjectAtIndex:i];
-            break;
+    if (self.chatView.inverted) {
+        for (NSInteger i = 0; i < self.messages.count; i++) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeAssistant && message.isLoading) {
+                [self.messages removeObjectAtIndex:i];
+                break;
+            }
+        }
+    } else {
+        for (NSInteger i = self.messages.count - 1; i >= 0; i--) {
+            KBAiChatMessage *message = self.messages[i];
+            if (message.type == KBAiChatMessageTypeAssistant && message.isLoading) {
+                [self.messages removeObjectAtIndex:i];
+                break;
+            }
         }
     }
     
@@ -556,7 +648,22 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
                     scrollView:(UIScrollView *)scrollView {
     CGFloat offsetY = scrollView.contentOffset.y;
     
-    // 下拉到顶部，加载历史消息
+    if (chatView.inverted) {
+        CGFloat contentHeight = scrollView.contentSize.height;
+        CGFloat scrollViewHeight = scrollView.bounds.size.height;
+        CGFloat maxOffsetY = contentHeight - scrollViewHeight + scrollView.contentInset.bottom;
+        if (maxOffsetY < 0) {
+            maxOffsetY = 0;
+        }
+        if (offsetY >= maxOffsetY - 50 && !self.isLoading && self.canTriggerLoadMore && self.hasMoreHistory) {
+            self.canTriggerLoadMore = NO;
+            [self loadMoreHistory];
+        } else if (offsetY < maxOffsetY - 100) {
+            self.canTriggerLoadMore = YES;
+        }
+        return;
+    }
+    
     if (offsetY <= 50 && !self.isLoading && self.canTriggerLoadMore && self.hasMoreHistory) {
         self.canTriggerLoadMore = NO;
         [self loadMoreHistory];
@@ -622,6 +729,7 @@ static NSString * const KBChatSessionDidResetNotification = @"KBChatSessionDidRe
     if (!_chatView) {
         _chatView = [[KBChatTableView alloc] init];
         _chatView.backgroundColor = [UIColor clearColor];
+        _chatView.inverted = YES;
         _chatView.delegate = self;
     }
     return _chatView;