How can we inherit UITableViewDataSource protocol in our class?

Question

I want to use table view in my application. But when i confirm my view controller to UITableViewDataSource, it gives error shown in image. How to use UITableViewDataSource protocol in our class.

Answer 1

That's not the proper way to specify protocol conformance. This is the proper syntax.

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
    // stuff
}

If you're still seeing that error, it's because your class doesn't implement the required methods from these delegates, in this case, numberOfRowsInSection.... and cellForRowAtIndexPath....

Answer 2

I would recommend to use class extensions for conforming a protocol, that kind of isolation makes your code more maintainable later when your class has grown up, like e.g.:

class MainViewController: UIViewController {

   // ...

}

and you can extend it with the protocols

extension MainViewController: UITableViewDataSource {

    func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int {
        return 0
    }

    func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! {
        return nil
    }

    // ... 

}

and

extension MainViewController: UITableViewDelegate {

    // ...

}