How to get which UITableViewCell selected without using UITableViewDelegate methods in iOS - ios

Question

I want to know that how to get selected cell's row index on selection of cell. But how to do it without usingUITableViewDelegate methods.
Please tell me.
I have search lot but not getting solution so please if anyone know tell me.
Please shared the viewpoints regarding it.
Thanks in Advance...!!!

Answer 1

In that case, your interviewer wanted to know how can you implement the delegation yourself...
To achieve that, Create a custom class "YourTableViewCell" extended fromUITableViewCell and use this class object to be returned in -tableView:cellForRowAtIndexPath:
Write a protocol "CellSelectionProtocol" with a method -
-(void) cellSelected: (YourTableViewCell *) cell;
Now delegate this protocol to your ViewController that has your TableView
and define the implementation of the method as below -
-(void) cellSelected: (YourTableViewCell *) cell
{
NSIndexPath *selectedIndexPath = [_yourTableView indexPathForCell: cell];
}
My answer would be this if it was an interview, and I am pretty sure it would be accepted.
But for a good architecture... the protocol & delegate implementation should be in two levels, like ->
YourTableViewCell -> delegates -cellSelected: -> YourTableView -> delegates -tableView:didSelectRowAtIndexPath: -> YourViewController
Please see: Your interviewer just wanted to know how you create delegations manually, instead of using default UITableViewDelegates.
EDIT # Unheilig
I mean in 2 levels because, the selection of a UITableViewCell has to be delegated to the UITableView and not directly to the controller for the following reasons
UITableViewCell is subview of UITableView
There can be multiple UITableView in a controller. So if you delegate cell selection directly, how will you tell the controller that cell got selected for which UITableView object?
Also UITableView might have to do other processing with other UITableViewCell, Like if selected and changes backgroundColor, the previous selected should get deselected and get default backgroundColor. Or add to the array of selected cells, if multiple selection is enabled.
There are many such similar architectural necessities that make me say - "But for a good architecture... the protocol & delegate implementation should be in two levels, like ->"
I hope that is pretty explanative now...

Answer 2

There is no way to get selected cell row index with out using tableview delegate methods.
when you click on tableview, didSelectRowAtIndexPath called and get the tableview cell index.
There is one way to do this, but it is not correct procedure to get tableview cell index. Create a button on tableviewcell and pass the indexvalue as sender tag to button action. But need to click only on that button.
Answer edited:
Create a transparent button on tableview cell in cellForRowAtIndexPath method and pass the cell index to button tag.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] ;
}
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(0, 0, cell.frame.size.width, cell.frame.size.height);
button.backgroundColor = [UIColor colorWithWhite:1.0 alpha:0.0];
[button addTarget:self action:#selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
button.tag = indexPath.row;
[cell addSubview:button];
cell.textLabel.text = [NSString stringWithFormat:#"%#",[numberArray objectAtIndex:indexPath.row]];
return cell;
}
-(void)buttonClicked:(id)sender
{
NSLog(#"%ld",(long)[sender tag]);
}