添加二级评论多个的时候的逻辑，默认每次点击出现5条

keyBoard/Class/AiTalk/V/KBAICommentFooterView.m

@@ -67,6 +67,14 @@
                        forState:UIControlStateNormal];
     break;
   }
+  case KBAIReplyFooterStateLoadMore: {
+    self.actionButton.hidden = NO;
+    NSInteger remaining = comment.totalReplyCount - comment.displayedReplies.count;
+    title = [NSString stringWithFormat:@"展开更多回复（%ld条）", (long)remaining];
+    [self.actionButton setImage:[UIImage systemImageNamed:@"chevron.down"]
+                       forState:UIControlStateNormal];
+    break;
+  }
   case KBAIReplyFooterStateCollapse: {
     self.actionButton.hidden = NO;
     title = @"收起";

keyBoard/Class/AiTalk/V/KBAICommentView.m

@@ -319,13 +319,17 @@ static NSString *const kCommentFooterIdentifier = @"CommentFooter";
 
 #pragma mark - Footer Actions
 
+/// 每次加载的回复数量
+static NSInteger const kRepliesLoadCount = 5;
+
 - (void)handleFooterActionForSection:(NSInteger)section {
   KBAICommentModel *comment = self.comments[section];
   KBAIReplyFooterState state = [comment footerState];
 
   switch (state) {
-  case KBAIReplyFooterStateExpand: {
-    [self expandRepliesForSection:section];
+  case KBAIReplyFooterStateExpand:
+  case KBAIReplyFooterStateLoadMore: {
+    [self loadMoreRepliesForSection:section];
     break;
   }
   case KBAIReplyFooterStateCollapse: {
@@ -337,15 +341,17 @@ static NSString *const kCommentFooterIdentifier = @"CommentFooter";
   }
 }
 
-- (void)expandRepliesForSection:(NSInteger)section {
+- (void)loadMoreRepliesForSection:(NSInteger)section {
   KBAICommentModel *comment = self.comments[section];
+  NSInteger currentCount = comment.displayedReplies.count;
   
-  // 一次性展开全部回复
-  [comment expandAllReplies];
+  // 加载更多回复
+  [comment loadMoreReplies:kRepliesLoadCount];
   
-  // 计算要插入的行
+  // 计算新增的行
+  NSInteger newCount = comment.displayedReplies.count;
   NSMutableArray *insertIndexPaths = [NSMutableArray array];
-  for (NSInteger i = 0; i < comment.displayedReplies.count; i++) {
+  for (NSInteger i = currentCount; i < newCount; i++) {
     [insertIndexPaths addObject:[NSIndexPath indexPathForRow:i inSection:section]];
   }