LXChatBox
文章简介：http://www.jianshu.com/p/d61962517cb6
self.chatBox =[[LXChatBox alloc]initWithFrame:CGRectMake(0, KScreenH - HEIGHT_TABBAR, KScreenW, HEIGHT_TABBAR)];
//设置最大行数限制（稍后会优化）
self.chatBox.maxVisibleLine = 3;
self.chatBox.delegate = self;
[self.view addSubview:self.chatBox];
//实现以下代理即可 ，返回聊天键盘的高度 与发送消息，目前只支持文本消息
-(void)changeStatusChat:(CGFloat)chatBoxY{
self.tableview.frame = CGRectMake(0, 64, KScreenW, chatBoxY - 20-64);
[self.tableview scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:self.array.count -1 inSection:0] atScrollPosition:UITableViewScrollPositionBottom animated:NO];
}
//发送消息的代理方法
-(void)chatBoxSendTextMessage:(NSString *)message{
NSAttributedString *attribute =[LXEmotionManager transferMessageString:message font:[UIFont systemFontOfSize:16.0] lineHeight:[UIFont systemFontOfSize:16.0].lineHeight];
[self.array addObject:attribute];
[self.tableview reloadData];
[self.tableview scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:self.array.count -1 inSection:0] atScrollPosition:UITableViewScrollPositionBottom animated:NO];
}