3D touch tableview? iOS, Swift

Question

Is it possible to add 3d touch to a table cell that gets the data of the new controller from Firebase?

I have this code below as an extension when I just press on the table cell it moves to the next controller fine and gets the correct data from Firebase, but when I use peek and pop I get a crash saying that the variable is not available. If I put static text in instead of getting it from the firebase array I get the same as well.

extension myVC: UIViewControllerPreviewingDelegate {

func previewingContext(_ previewingContext: UIViewControllerPreviewing, commit viewControllerToCommit: UIViewController) {
    present(viewControllerToCommit, animated: true)
}


private func createDetailViewControllerIndexPath(indexPath: IndexPath) -> MainInfoVC {

    let dataPop = self.posts[indexPath.row]
    let infoPop = dataPop

    let storyboard = UIStoryboard(name: "ShowAndComments", bundle: nil)
    let vc = storyboard.instantiateViewController(withIdentifier: "MainInfoVC") as? MainInfoVC

    vc?.descriptionLabel.text = infoPop.desc

    return vc!
}

func previewingContext(_ previewingContext: UIViewControllerPreviewing, viewControllerForLocation location: CGPoint) -> UIViewController? {
    guard let indexPath = tableView.indexPathForRow(at: location) else { return nil }

    let  detailViewController = createDetailViewControllerIndexPath(indexPath: indexPath)
    return detailViewController
}
}

I also get a crash if I change this To..

vc?.descriptionLabel.text = "Some Text"

myApp was compiled with optimization - stepping may behave oddly; variables may not be available. (lldb)

Nothing to do with Firebase, as you yourself have said. So that shouldn't be in the title or the tags. The question thus devolves to: Can one do 3D touch for a table view cell in a master-detail architecture? Yes, one can, obviously; the Mail app is a case in point. (Probably the problem you're having has nothing to do with 3D touch either, though.) — matt, Nov 29 '17 at 21:25
Thank you for your response on this. I had also come to the same conclusion and found that I didn't have to pass anything over as I had already obtained the info from firebase and saved it to each cell even though I wasn't displaying it. I was able to swap some code around and it now works. Again thank you for your time on this. — Tony Merritt, Nov 29 '17 at 21:28
The data I was trying to get was coming from firebase and being stored into an array but I was only using 2 parts of the data in the cell that was displayed when I pushed the cell I wanted to display the rest of the data from firebase. the posts array is what is holding the firebase data. — Tony Merritt, Nov 29 '17 at 21:42

score 2 · Answer 1 · answered Nov 29 '17 at 21:23

2

IBOutlets are nil early in a view controller's lifecycle. They are only non-nil after viewDidLoad. By default they are implicitly unwrapped, so if you message them before they have been initialized you'll get an unwrapped nil crash.

You should create a String property on MainInfoVC and set descriptionLabel's text property from viewDidLoad.

answered Nov 29 '17 at 21:23

beyowulf

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Thank you for your time on this. I was able to swap some code around and able to get this to work thank you again. – Tony Merritt Nov 29 '17 at 21:29

score 1 · Answer 2 · answered Nov 29 '17 at 21:33

I was able to figure this out. Because i had already downloaded the data from firebase and was holding it in an array, I was able to change the code around and get it to work.

extension myVC: UIViewControllerPreviewingDelegate {

func previewingContext(_ previewingContext: UIViewControllerPreviewing, commit viewControllerToCommit: UIViewController) {
     let navigationController = UINavigationController(rootViewController: viewControllerToCommit)
}

func previewingContext(_ previewingContext: UIViewControllerPreviewing, viewControllerForLocation location: CGPoint) -> UIViewController? {
    guard let indexPath = tableView.indexPathForRow(at: location) else { return nil }

    let storyboard = UIStoryboard(name: "ShowAndComments", bundle: nil)

    let vc = storyboard.instantiateViewController(withIdentifier: "MainInfoVC") as? MainInfoVC

    let dataPop = self.posts[indexPath.row]
    let platePop = dataPop.postKey

    return vc
}
}

3D touch tableview? iOS, Swift

2 Answers2