Question

I have this code here to check on the existence of the ViewController. And unfortunately it doesn’t work. The thing is, it is executed at the moment of another VC popping from the Navigation Stack:

- (void) leftViewDidHide{
    if ([((AppDelegate *)[UIApplication sharedApplication].delegate).frontViewController.navigationController.viewControllers objectAtIndex:1]) {
    SGServerListViewController *sample = [[[((AppDelegate *)[UIApplication sharedApplication].delegate).frontViewController.navigationController.viewControllers objectAtIndex:1]childViewControllers] objectAtIndex:0];
    [sample.serverTableView setUserInteractionEnabled:YES];
    }
}

The app crashes with an exception breakpoint pointing me to the line with an if statement. Any ideas on what could be wrong here? I’m just trying to check if this VC is there and if it is – execute the code.

Answer 1

- (void) leftViewDidHide{

if ([((AppDelegate *)[UIApplication sharedApplication].delegate).frontViewController.navigationController.viewControllers count] == 1) {

         SGServerListViewController *sample = [[[((AppDelegate *)[UIApplication sharedApplication].delegate).frontViewController.navigationController.viewControllers objectAtIndex:1]childViewControllers] objectAtIndex:0];
         [sample.serverTableView setUserInteractionEnabled:YES];

     }
 }