Unrecognized selector sent to instance UITableViewCell - ios

Question

i have looked up the same questions, but the answers given don't seem to fix my problem.
I'm creating an app where you can add and remove your school marks. In my view controller i have created a UITableView. Within there there's a custom UITableViewCell, called TableViewCell. To delete a cell i need to get it's row. I try that by using the following code in the TableViewCell class:
- (IBAction)DeleteMark:(id)sender {
UITableView *superTableView = [self superview];
NSIndexPath *path = [superTableView indexPathForCell:self];
NSInteger *index = [path row];
NSLog([NSString stringWithFormat:#"%#", index]);
}
When i run the code it shows the following error:
-[UITableViewWrapperView indexPathForCell:]: unrecognized selector sent to instance 0xa825a00
As i said before i tried the solutions given on the forums, but none of them worked.
EDIT
Here's my code for cellForRowAtIndexPath
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
TableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"cell" forIndexPath:indexPath];
float weight = [[_editableClass.markWeights objectAtIndex:indexPath.row]floatValue];
float mark = [[_editableClass.classMarks objectAtIndex:indexPath.row]floatValue];
cell.MarkTextLabel.text = [NSString stringWithFormat:#"%.1f", mark];
cell.MarkWeight.text = [NSString stringWithFormat:#"%.1f", weight];
[cell.DeleteButton setTag:indexPath.row];
return cell;
}

Answer 1

To do something like what you are after you could try to set up a delegate to pass back the cell object so you can find the index from the tableView. I have tried to make an example below. For tidiness I have omitted import statements.
ViewController header file
#interface subClassViewController : UIViewController<UITableViewDataSource, UITableViewDelegate,TableViewCellDelegate>
#property (weak, nonatomic) IBOutlet UITableView *tableView;
#end
ViewController implementation file
#implementation subClassViewController
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath
{
//setup cell...
cell.delegate = self;
return cell;
}
- (void)deletePressedOnCell:(UITableViewCell *)cell
{
NSInteger index = [self.tableView indexPathForCell:cell].row;
// do something with index
}
#end
TableViewCell header file
#protocol TableViewCellDelegate
- (void)deletePressedOnCell:(UITableViewCell *)cell;
#end
#interface TableViewCell : UITableViewCell
#property (weak, nonatomic) id<TableViewCellDelegate>delegate;
#end
TableViewCell implementation file
#implementation TableViewCell
- (IBAction)DeleteMark:(id)sender
{
[self.delegate deletePressedOnCell:self];
}
#end

Answer 2

In your UITableview Delegate method cellForRowAtIndexPath set tag of your button:-
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
.....
cell.yourdeletebutton.tag=indexPath.row;
}
Now in your delete method it looks like:-
- (IBAction)DeleteMark:(id)sender {
UIButton *tappedButton = (UIButton*)sender;
DeleteIndex=tappedButton.tag;
NSLog(#"delete row at indexpath :%#", DeleteIndex]);
}

Answer 3

You can use by [sender tag],
[cell.btnDelete setTag:indexPath.row];
[cell.btnDelete addTarget:self action:#selector(DeleteMark:) forControlEvents:UIControlEventTouchUpInside];
Method,
- (IBAction) DeleteMark:(id)sender {
NSInteger *index = [sender tag];
NSLog([NSString stringWithFormat:#"%#", index]);
// Your Code...
//For Eg.
Object *obj = [YOUR_ARRAY objectAtIndex:[sender tag]];
// You'll get object of particular index.
// Your Code...
}
Thanks.

Answer 4

You shouldn't rely on [[[[sender superview] superview] superview] superview], what if Apple decide to make some changes and add/remove another layer of subview.
The idea with tags is not ideal neither.
I would recommended you to use delegate pattern or blocks.
Please have a look how closures works. Note that it's written in swift but it could be easily translated to Objective-C.
In your TableViewCell add handler property:
var buttonPressHandler: (() -> ())?
Add IBAction which must be connected to button touch event (you could do it in storyboard):
#IBAction func buttonPressed(sender: AnyObject) {
// Call handler when button is pressed
buttonPressHandler?()
}
In cellForRowAtIndexPath you only needs to set up the handler:
cell.buttonPressHandler = {
print("Button pressed: \(indexPath.row)")
}

Answer 5

Get the index path of the row using following code
- (void)tapped:(UIButton *) sender {
UITableViewCell * tCell;
NSComparisonResult order = [[UIDevice currentDevice].systemVersion compare: #"7.2" options: NSNumericSearch];
if (order == NSOrderedDescending) {
tCell = (BusinessFavoriteCell *)[[[[sender superview] superview] superview] superview];
} else {
tCell = (BusinessFavoriteCell *)[[[sender superview] superview] superview];
}
NSIndexPath * iPath = [self.tableView indexPathForCell:tCell];
}
Here, tCell is the UITableViewCell which is loaded in cellForRowIndexpath method.