Fails with "Non objc-method numberOfTableCells cannot satisy optional requirement of @objc protocol UITableViewDatasource and other similar errors when the delegate implementation is in the extension. See: https://gist.github.com/josephlord/af63ecaada47f2f2ab58 for a non-extension working version of this code.

GenericObjcProtocolInExtensionBroken.swift

import UIKit

class GenericTVCDelegate<A> : NSObject {
    var cellCreator:A->UITableViewCell
    var data:[A]
    init(cellCreator:A->UITableViewCell, data:[A]) {
        self.cellCreator = cellCreator
        self.data = data
    }
}

extension GenericTVCDelegate : UITableViewDataSource {
    @objc func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        return cellCreator(data[indexPath.row])
    }
    
    @objc func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return 1
    }
    @objc func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return data.count
    }
}

func simpleCellCreator(s:String)->UITableViewCell {
    let cell = UITableViewCell(frame: CGRectZero)
    cell.textLabel?.text = s
    return cell
}

let strings = ["ba", "da", "bing"]
let datasource = GenericTVCDelegate(cellCreator: simpleCellCreator, data: strings)

let tableView = UITableView(frame: CGRect(x: 0, y: 0, width: 200, height: 400), style: .Plain)
tableView.dataSource = datasource
tableView.reloadData()
tableView

Hi! Any news on this?