从UITableViewCell到DetailViewController的选择不起作用

Question

I've got this problem where when running my app on the iOS simulator, a segue I have from a custom table view cell to a detail view controller doesn't work. I can click on the cell but then the app freezes and I can no longer do anything without having to stop running the app and restart it. I have such segues in a few places in my app, and only one of them works fine, the others don't. I've made sure that the segue identifier is okay, still nothing works. Any ideas on why this is happening?

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

    if segue.identifier == "showDetail" {

        let cell = sender as! UITableViewCell
        let indexPath = tableView.indexPathForCell(cell)

        let detailViewController: DetailTableViewController = segue.destinationViewController as! DetailTableViewController

        let objectAtIndex: Tasks = fetchedResultsController.objectAtIndexPath(indexPath!) as! Tasks

        detailViewController.receivingObject = objectAtIndex

    }

}

Answer 1

Add this extension to by pass nav controllers while segueing

extension UIViewController{
    var visibleVC: UIViewController {
        if self is UINavigationController{
            if let cvc = (self as! UINavigationController).visibleViewController { return cvc }
        }
        return self 
    }
}

and try this prepare segue func

if segue.identifier == "showDetail" {
        if let cell = sender as! UITableViewCell{
             let indexPath = tableView.indexPathForCell(cell)
             if let let detailViewController = segue.destinationViewController. visibleVC as! DetailTableViewController{
                  if let objectAtIndex = fetchedResultsController.objectAtIndexPath(indexPath!) as! Tasks{
                      detailViewController.receivingObject = objectAtIndex
                  } else { print("unlikely") }
             } else { print("wiring problem in storyboard") }
        } else { print("segue is not initiated from a cell") }
 }

This will at list make it easier to figure out where the problem is but I think its just the nav vc getting in the way.