修改KBChatUserMessageCell文字居中问题

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

@@ -43,6 +43,7 @@
     self.messageLabel.numberOfLines = 0;
     self.messageLabel.font = [UIFont systemFontOfSize:16];
     self.messageLabel.textColor = [UIColor blackColor];
+    self.messageLabel.textAlignment = NSTextAlignmentLeft;
     [self.bubbleView addSubview:self.messageLabel];
     
     // 加载指示器
@@ -76,6 +77,7 @@
 
 - (void)configureWithMessage:(KBAiChatMessage *)message {
     self.messageLabel.text = message.text;
+    [self updateMessageAlignmentForText:message.text];
 
     if (message.isLoading) {
         self.bubbleView.hidden = YES;
@@ -87,4 +89,24 @@
     }
 }
 
+- (void)updateMessageAlignmentForText:(NSString *)text {
+    if (self.messageLabel.hidden || text.length == 0) {
+        return;
+    }
+    
+    if ([text rangeOfString:@"\n"].location != NSNotFound) {
+        self.messageLabel.textAlignment = NSTextAlignmentLeft;
+        return;
+    }
+    
+    CGSize singleLineSize = [text sizeWithAttributes:@{NSFontAttributeName: self.messageLabel.font}];
+    CGFloat minBubbleWidth = 50.0;
+    CGFloat padding = 24.0;
+    if (singleLineSize.width + padding <= minBubbleWidth + 0.5) {
+        self.messageLabel.textAlignment = NSTextAlignmentCenter;
+    } else {
+        self.messageLabel.textAlignment = NSTextAlignmentLeft;
+    }
+}
+
 @end