Question 177635 in IOS Swift Question posted in
The official documentation can be found here.

“Why isn’t Custom UITableView loading in SwiftUI, even though delegate methods are executing except cellForRow?”

I have situation where I have to use UIKit custom view with TableView inside SwiftUI but table view is not appearing in SwiftUI, however delegate methods are executing except for the cellForRow. I am not using storyboard in my project.

Example

Here is my custom view with my tableview and delegate methods

class CustomTableView: UIView, UITableViewDelegate, UITableViewDataSource {
    var tableView: MyCustomTableView {
        let tableview = MyCustomTableView(frame: .zero, style: .plain)
        tableview.delegate = self
        tableview.dataSource = self
        return tableview
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 10
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = UITableViewCell()
        cell.textLabel?.text = "Hello (indexPath.row)"
        return cell
   }
}

This is my tableview

class MyCustomTableView: UITableView {

    override init(frame: CGRect, style: UITableView.Style) {
        super.init(frame: frame, style: style)
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

This is my Representable for CustomTableView

struct CustomTableViewRepresentable: UIViewRepresentable {

    func makeUIView(context: Context) -> CustomTableView {
        CustomTableView(frame: .zero)
    }

    func updateUIView(_ uiView: CustomTableView, context: Context) {
        uiView.tableView.reloadData()
    }
}

This is my SwiftUI view which will load on one of the button click event

struct SwiftUIView: View {

    var body: some View {
        VStack {
            CustomTableViewRepresentable()
        }.background(Color.yellow)
    }
}

Please help and advise. Thanks.

I added code in details section that I tried but I have no luck. I am missing something but don’t know what is it?

Here is the link to Sample project: https://www.dropbox.com/s/q0nfphass8tohhb/TableViewPOC.zip?dl=0

Tags:

2

Answers


  1. 0

    You have neither set your MyCustomTableView‘s frame nor set Autolayout constrains.

    Please give enough layout data to it so that it can be successfully rendered.

    Login or Signup to reply.
  2. 0

    You need to register a Cell, so you need to call register(_:forReuseIdentifier:), as follows:

    var tableView: MyCustomTableView {
  let tableview = MyCustomTableView(frame: .zero, style: .plain)
  tableview.delegate = self
  tableview.dataSource = self
  tableView.tableView.register(UITableViewCell.self,
                               forCellReuseIdentifier: "DefaultCell")
  return tableview
}

    So use one of the following:

    1. Default: tableView.register(UITableViewCell.self, forCellReuseIdentifier: "DefaultCell")
    2. Custom: tableView.register(CustomTableViewCell.self, forCellReuseIdentifier: "DefaultCell")
    3. From Nib: tableView.register(UINib(nibName: "yourNib", bundle: nil), forCellReuseIdentifier: "DefaultCell")

    And later in tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath), you’ll need to manipulate the registered cell by using dequeueReusableCell(withIdentifier:), like the following:

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
  guard let cell = tableView.dequeueReusableCell(withIdentifier: "DefaultCell")
  else { return }

  // Cell customizations...

  return cell
}
    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search