1.cell 刷新
NSIndexPath *indexPath_1=[NSIndexPath indexPathForRow:1 inSection:0];
NSArray *indexArray=[NSArray arrayWithObject:indexPath_1]; [_tableView reloadRowsAtIndexPaths:indexArray withRowAnimation:UITableViewRowAnimationNone];
2.界面返回,保持所选cell
-(void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
NSIndexPath *selected = [_tableView indexPathForSelectedRow];
if(selected) [_tableView selectRowAtIndexPath:selected animated:NO scrollPosition:UITableViewScrollPositionNone];
}