Problem with Segue

Question

Created Mar ’23

Replies 2

Boosts 0

Participants 2

I'm stuck in a problem: I have a project with a lot of segues and vc's. After I was changing some ViewController to a TableViewController the segue to this won't work anymore. I created a blank TableViewController from Cocoa-Class as Subclass of UITableViewController. I'm using Storyboard and IB.

In HomeViewController I have a tableView. The Cell has a protocol HomeTableViewCellDelegate with some functions. One of them is didTapPostImage(post: PostModel). In the Cell I set a tapGesture to the PostImage:

func addTapGestureToPostImage(){
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleTapPost))
        postImageView.isUserInteractionEnabled = true
        postImageView.addGestureRecognizer(tapGesture)
        print("TEMP -> TapGesture active")
    } 
    @objc func handleTapPost(){
        guard let post = post else { return }
        print("TEMP -> post image clicked")
        delegate?.didTapPostImage(post: post)
    }

In awakeFromNib I call the function of course.

In the HomeViewController I have an extension

extension NewsFeedViewController: HomeTableViewCellDelegate {
    func didTapPostImage(post: PostModel) {
        self.post = post
        performSegue(withIdentifier: "HomeToSinglePostViewController", sender: self)
        print("TEMP -> performSegue")
    }
}

and I'm overriding prepare like:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "HomeToSinglePostViewController" {
            print("TEMP -> prepare")
            let singlePostVC = segue.destination as! SinglePostViewController
            singlePostVC.post = self.post
        }
    }

I've tried to rename the segue identifier - but that don't work, too. In prepare and in the extension I have some other segues to other vc's that all are working. When I navigate to another VC to access the new SinglePostViewController the segue doesn't work, too. The SinglePostViewController is unreachable from everywhere - but I get no error or hint.

In my log I can see that TapGesture, prepare-part and perform-part are called!

Before I created the TableViewController with class it was a ViewController with a ScrollView and a TableView inside - with that all was fine! What I'm missing? Tried so many things but no luck!

My HomeViewController is nested in a Navigation Controller - the SinglePostViewController not ( but the old one wasn't, too )

Hope someone has an answer. I'm using Xcode 14.2 with Swift 5 - InterfaceBuilder Project.

Kind regards and thanks in advance!

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Answer 1

Claude31 OP

Mar ’23

You don't show all the classes, so hard to tell. Just trying to understand from the explanations is really too confusing.

So explain clearly and synthetically what is the setup is ?
Do you get the prints in log ?

            print("TEMP -> prepare")

Move the print before performSegue:

        print("TEMP -> performSegue")
        performSegue(withIdentifier: "HomeToSinglePostViewController", sender: self)

How is SinglePostViewController defined ?

After I was changing some ViewController to a TableViewController

Which ViewController ? Could you show the related segue ?

Did you do a Clean Build Folder after the change ?

0

Answer 2

Turntable OP

Mar ’23

Thanks for reply.

After I setup here and there I found out that a class to auto height the table view header to fit a label was the problem. Next step is to find out what's wrong there but for now it's working.

override func viewDidLayoutSubviews(){
        super.viewDidLayoutSubviews()
        sizeHeaderToFit()
    }

    func sizeHeaderToFit(){
        guard let headerView = tableView.tableHeaderView else { return }
        headerView.setNeedsLayout()
        headerView.layoutIfNeeded()
        let height = headerView.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize).height
        var frame = headerView.frame
        frame.size.height = height - 412
        headerView.frame = frame
        tableView.tableHeaderView = headerView
    }

Here the 412 stands for all items (height) in the header together except the textfield.

The header was assigned to class "TableViewHeaderSinglePost" wich contains:

class TableViewHeaderSinglePost: UIView {
    @IBOutlet var postTextLabel:UILabel!

    override func layoutSubviews() {
        super.layoutSubviews()
        postTextLabel.preferredMaxLayoutWidth = postTextLabel.bounds.width
    }
}

If someone sees the problem please let me know ;-)

Thanks so far for helping me! Kind regards

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