处理滚动底部问题

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

@@ -13,6 +13,7 @@
 
 @property (nonatomic, strong) UIView *bubbleView;
 @property (nonatomic, strong) UILabel *messageLabel;
+@property (nonatomic, strong) UIActivityIndicatorView *loadingIndicator;
 
 @end
 
@@ -44,12 +45,20 @@
     self.messageLabel.textColor = [UIColor blackColor];
     [self.bubbleView addSubview:self.messageLabel];
     
+    // 加载指示器
+    self.loadingIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
+    self.loadingIndicator.hidesWhenStopped = YES;
+    [self.contentView addSubview:self.loadingIndicator];
+    
     // 布局约束
     [self.bubbleView mas_makeConstraints:^(MASConstraintMaker *make) {
         make.top.equalTo(self.contentView).offset(4);
         make.bottom.equalTo(self.contentView).offset(-4);
         make.right.equalTo(self.contentView).offset(-16);
         make.width.lessThanOrEqualTo(self.contentView).multipliedBy(0.75);
+        // 最小高度约束，确保 loading 时气泡不消失
+        make.height.greaterThanOrEqualTo(@40);
+        make.width.greaterThanOrEqualTo(@50);
     }];
     
     [self.messageLabel mas_makeConstraints:^(MASConstraintMaker *make) {
@@ -58,10 +67,24 @@
         make.left.equalTo(self.bubbleView).offset(12);
         make.right.equalTo(self.bubbleView).offset(-12);
     }];
+    
+    [self.loadingIndicator mas_makeConstraints:^(MASConstraintMaker *make) {
+        make.centerY.equalTo(self.contentView);
+        make.right.equalTo(self.contentView).offset(-16);
+    }];
 }
 
 - (void)configureWithMessage:(KBAiChatMessage *)message {
     self.messageLabel.text = message.text;
+
+    if (message.isLoading) {
+        self.bubbleView.hidden = YES;
+        [self.loadingIndicator startAnimating];
+    } else {
+        self.bubbleView.hidden = NO;
+        self.messageLabel.hidden = NO;
+        [self.loadingIndicator stopAnimating];
+    }
 }
 
 @end