UITableView进阶，cell刷新，界面返回 保持所选cell

NSIndexPath  *indexPath_1=[NSIndexPath indexPathForRow:1 inSection:0];
NSArray      *indexArray=[NSArray  arrayWithObject:indexPath_1];

[_tableView reloadRowsAtIndexPaths:indexArray withRowAnimation:UITableViewRowAnimationNone];

-(void)viewDidAppear:(BOOL)animated{
    [super viewDidAppear:animated];
    NSIndexPath *selected = [_tableView indexPathForSelectedRow];
    if(selected) [_tableView selectRowAtIndexPath:selected animated:NO scrollPosition:UITableViewScrollPositionNone];
}