Question

Is there a way to get a reference to the view controller of my superview?
There were several instances that I needed this on the past couple of months, but didn’t know how to do it. I mean, if I have a custom button on a custom cell, and I wish to get a reference of the table view controller that controls the cell I`m currently in, is there a code snippet for that? Or is it something that I should just solve it by using better design patterns?

Thanks!

Answer 1

When I asked this question I was thinking of, in a situation where I have custom cells with buttons on them, how can the TableViewController know which cell’s button was tapped.
More recently, reading the book “iOS Recipes”, I got the solution:

-(IBAction)cellButtonTapped:(id)sender
{
NSLog(@"%s", __FUNCTION__);
UIButton *button = sender;

//Convert the tapped point to the tableView coordinate system
CGPoint correctedPoint = [button convertPoint:button.bounds.origin toView:self.tableView];

//Get the cell at that point
NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:correctedPoint];

NSLog(@"Button tapped in row %d", indexPath.row);
}

Another solution, a bit more fragile (though simpler) would be:

- (IBAction)cellButtonTapped:(id)sender 
{
    // Go get the enclosing cell manually
    UITableViewCell *parentCell = [[sender superview] superview];
    NSIndexPath *pathForButton = [self.tableView indexPathForCell:parentCell];
}

And the most reusable one would be to add this method to a category of UITableView

- (NSIndexPath *)prp_indexPathForRowContainingView:(UIView *)view 
{
   CGPoint correctedPoint = [view convertPoint:view.bounds.origin toView:self]; 
   return [self indexPathForRowAtPoint:correctedPoint];
}

And then, on your UITableViewController class, just use this:

- (IBAction)cellButtonTapped:(id)sender 
{
    NSIndexPath *pathForButton = [self.tableView indexPathForRowContainingView:sender];
}