Could not cast value of type 'UIViewController' to UITableViewController

Question

I'm trying to segue from one view controller to another, and pass data to the next controller, but I keep getting this error:

Could not cast value of type ViewController to [VC2]

Setup looks like this:

NavigationController is initial entry point to VC1
ViewController1 is a collectionViewController with show segue to VC2
ViewController2 is a viewController with only a container to embed VC3
ViewController3 is a tableViewController with static table and collectionView.

VC3 is my destinationViewController and embedded in VC2. When I select a collectionViewCell from VC1 I get Signal SIGABRT.

override func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {

        selectedImage = UIImage(named: wholeArray[indexPath.row]["image"] as! String)!
        selectedLabel = wholeArray[indexPath.row]["name"] as? String

        self.performSegueWithIdentifier("show", sender: nil)
    }

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

    if (segue.identifier == "show") {
      let secondVC: ViewController02 = (segue.destinationViewController as? ViewController02)!

            secondVC.image = selectedImage
            secondVC.label = selectedLabel
        }
    }

Since UITableViewController is a subclass of UIViewController, this code should work just fine. What am I doing wrong?

** Updated question with type inheritance and exact error message: **

class ViewController01: UICollectionViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {

class ViewController02: UIViewController {

class ViewController03: UITableViewController, UICollectionViewDataSource, UICollectionViewDelegate,UIScrollViewDelegate {

class HeaderView: UIView {

2015-10-07 11:26:27.384 UITableViewHeader[45474:3576139] Unknown class _TtC17UITableViewHeader14ViewController in Interface Builder file.

Could not cast value of type 'UITableViewHeader.ViewController02' (0x107a38360) to 'UITableViewHeader.ViewController03' (0x107a38a50).

please include the type inheritances of the different controllers and include the EXACT error message, dont rephrase, dont retype, copy&paste it. — luk2302, Oct 07 '15 at 15:26
In debugger I entered: po secondVC.image error: Execution was interrupted, reason: EXC_BAD_ACCESS (code=EXC_I386_GPFLT). The process has been returned to the state before expression evaluation. — mvien, Oct 07 '15 at 15:55
@Cosyn Thanks. I checked the classes in SB and made sure they matched the signatures. — mvien, Oct 12 '15 at 12:57
Try this link [prepare(for segue:) with navigation controller](https://stackoverflow.com/questions/28788416/swift-prepareforsegue-with-navigation-controller) — Jack Shih, Nov 14 '17 at 07:50

score 0 · Answer 1 · answered Oct 07 '15 at 15:15

0

Change this line in your code

let secondVC: ViewController02 = (segue.destinationViewController as? ViewController02)!

To

let secondVC:ViewController02 = segue.destinationViewController as! ViewController02

or simple to:

    let secondVC = segue.destinationViewController as! ViewController02

answered Oct 07 '15 at 15:15

William Kinaan

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Thanks William, Tried both of those and multiple other variations. No luck and same error message. – mvien Oct 07 '15 at 15:27
@mvien what is the error? plus show me please the signature of `ViewControlelr02` – William Kinaan Oct 07 '15 at 15:44
updated the question with signatures of all view controllers and subclass uiview. Also included exact error message – mvien Oct 07 '15 at 15:56
on which class are you using the `prepareForSegue ` ? – William Kinaan Oct 07 '15 at 16:07
VC1: UICollectionViewController – mvien Oct 07 '15 at 16:15

Could not cast value of type 'UIViewController' to UITableViewController

1 Answers1