UITableView不符合协议UITableViewDataSource错误

Question

Question 1)

I've spent a few hours trying to figure out this problem, from what I've read those are the two functions needed to implement the UITableView but it still gives me the error in the title:

import UIKit

class UITableView: UIViewController, UITableViewDataSource,UITableViewDelegate
{

    override func viewDidLoad()
    {

        super.viewDidLoad()

    }

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


    }


    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
    {

    }

}

Question 2)

The TableView is a part of a tabbed view controller that I am implementing for my app. I want my TableView controller to have entries that once pressed will open another ViewController. How can I implement something like that?

Thank you in advance

Answer 1

You have incorrectly set up your ViewController. Either create a UITableViewController which is just a UITableView, or add a UITableView to a UIViewController (Like you have almost done).

The didSelectRowAt method will allow you to segue to a new viewController, but in my examples only if it is set up correctly in a storyboard.

UITableViewController option

class TableViewController: UITableViewController {

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

// MARK: - Table view data source

override func numberOfSections(in tableView: UITableView) -> Int {
    // #warning Incomplete implementation, return the number of sections
    return 0
}

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of rows
    return 0
}

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "reuseIdentifier", for: indexPath)
    // Configure the cell...
    return cell
}

// MARK: - Table view delegate

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    tableView.deselectRow(at: indexPath, animated: false)
    performSegue(withIdentifier: "SegueIdentifier", sender: self)
}

UIViewController option
(The UITableView will need to be added through a Storyboard in this example)

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

@IBOutlet weak var tableView: UITableView!

override func viewDidLoad() {
    super.viewDidLoad()
    tableView.delegate = self
    tableView.dataSource = self
}

// MARK: - Table view data source

func numberOfSections(in tableView: UITableView) -> Int {
    // #warning Incomplete implementation, return the number of sections
    return 0
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of rows
    return 0
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "reuseIdentifier", for: indexPath)
    // Configure the cell...
    return cell
}

// MARK: - Table view delegate

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    tableView.deselectRow(at: indexPath, animated: false)
    performSegue(withIdentifier: "SegueIdentifier", sender: self)
}

Here is an example project to work from

Answer 2

You shouldn't be using UITableView to manage the data source. That should be the job of UITableViewController which manages data to be displayed on UITableView . The View in general should only worry about how to display the data, not manage it. See MVC design pattern by Apple.

Apple has a really nice, and complete Swift App tutorial (See Display the Data) that goes through how to set up UITableViewController with a table view you built with storyboard. You can also download and run the source project at the end of the page. I highly recommend it.

Answer 3

You have to to Implement This Mendatory DataSource Method

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

Hope it Helps.