How to make a class in Swift extend a concrete class and conform to multiple protocols?

Question

Background

I am creating an extension for UITableViewController like so:

func attachToController<C: UIViewController>(_ sender: C, alignTo: UIView, to: ALEdge = .top , withOffset: CGFloat = 0.0)
    where C: UITableViewDataSource, C:UITableViewDelegate
{
    self.estimatedRowHeight = 44
    ..
    self.delegate = sender as UITableViewDelegate
    self.dataSource = sender as UITableViewDataSource
}

Currently the class that's using this extension is declared like so:

final class MyViewController: UIViewController {

then I call this in view did load:

override func viewDidLoad() {
    super.viewDidLoad()
    self.setupTableView()
}

..

func setupTableView() {
    self.tableView.attachToController(self, alignTo: self.view, withOffset: 0.0)
    ..
 }

But I'm getting the error

Ambiguous reference to member 'tableView'

I would like to declare MyViewController so that it extends UIViewController and also conforms to the UITableViewDataSource and UITableViewDelegate protocols.. ideas?

Note: I'm using Swift 4.2.

score 1 · Accepted Answer · answered Nov 23 '18 at 08:31

1

Just add it

final class MyViewController: UIViewController, UITableViewDataSource, UITableViewDelegate

Also if the attachToController(...) extension is on UITableViewController it won't work, I assume according to how you call it, you want it to be on UITableView

answered Nov 23 '18 at 08:31

olejnjak

1,163
1
9
23

it works just fine.. i'm doing this `self.tableView.attachToController` – abbood Nov 23 '18 at 08:43

How to make a class in Swift extend a concrete class and conform to multiple protocols?

Background

1 Answers1