1.插入新的数据并显示
-(void)insertTableView:(Model *)model {
NSMutableArray *indexPaths = [[NSMutableArray alloc] init];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:_dataSource.count inSection:0]; //创建新的NSIndexPath
[indexPaths addObject:indexPath]; //增加到NSMutableArray中去
[_dataSource addObject:model]; //UITableView 数据源更新数据
[tableView insertRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationAutomatic]; //将新的行增加到表中
[tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionBottom animated:YES]; //将表滑动到最后一行
}