Question

My ViewController1 pushes ViewController2

ViewController2 *controller =
    [[ViewController2 alloc] init];
[self.navigationController pushViewController:controller
    animated:NO];
[controller release];

ViewController2 has UITableView … in xib file I connected delegate with File’s Owner. Also ViewController2 has Done button

- (IBAction)doneButtonPressed {
     [self.navigationController popViewControllerAnimated:NO];
 }

The problem is that if to click table rows and done button at the same time, sometimes didSelectRowAtIndexPath: method calls after that ViewController2 was popped, and I have SIGABRT error and this thing in logger :

[__NSCFSet tableView:didSelectRowAtIndexPath:]: unrecognized selector sent to instance 0x62579d0'

So how tableView:didSelectRowAtIndexPath can be called after I popped viewController2 ? It should be dead…

Answer 1

One easy fix is to do this:

- (IBAction)doneButtonPressed {
     self.tableView.delegate = nil;
     [self.navigationController popViewControllerAnimated:NO];
 }

That way you guarantee that while you’re leaving that view no more delegate calls will happen. You could also do this in the dealloc method for the view controller (probably a better place for it).