UITableView中最后选择的行

Question

I have UITableView, in which if any row is selected i am storing some values. If any other row is selected i am displaying an alertView with warning that his previous selection will be gone. This alerView has 2 buttons YES and NO. If YES is selected go on to selecting the new row which is fine. But if no is selected i want reselect the previous row. I can post the code if asked. But it seems more of logical question than code oriented.

Thank you.

Answer 1

first store the clicked tableview index to your global variable in UITableView Delegate like below,

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    if (tableView==yourTableview) {
        yourMemberVariable=[indexPath row];
  }
}

then check yourMemberVariable in UIAlertView delegate

 - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    if(buttonIndex == 0)//OK button pressed
    {
       //do something
    }else{
    if(yourMemberVariable>someValue){ //perform your own conditions whatever
       [myTableView selectRowAtIndexPath:[NSIndexPath indexPathForRow:yourMemberVariable   inSection:0] animated:NO scrollPosition:UITableViewScrollPositionTop];
       }
    }
 }

Answer 2

You want to know the last row selected ,you can do this by setting

    tableView.remembersLastFocusedIndexPath = true  

in viewDidLoad function.

and then calling

   tableView.indexPathForSelectedRow 

wherever required.

Answer 3

It's simple. Just save previous row into class member. Good luck!

Answer 4

Keep track of the last selected item. On the select delegate for the table, store what was selected in a variable accessible througout the class.

NSInteger selectedRow = 0;
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    selectedRow = [indexPath row];
}

Now you know what element to select if NO is pressed in the UIAlertView delegate

[myTableView selectRowAtIndexPath:[NSIndexPath indexPathForRow:selectedRow inSection:0] animated:NO scrollPosition:UITableViewScrollPositionTop];