FirstViewController不符合协议

Question

I wrote this in Xcode 6 (Swift) but it says "Type 'FirstViewController' does not conform to protocol 'UITableViewDataSource'" and won't let me build the program. Please help?

import UIKit

class FirstViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

//UIViewTableDataSource
func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int{
   return taskMGR.tasks.count
}


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



        let cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier:
            "test")

        cell.textLabel?.text = taskMGR.tasks[indexPath.row].name
        cell.detailTextLabel?.text = taskMGR.tasks[indexPath.row].desc

        return cell
}

}

Answer 1

I rewrote your class to work. I deleted a couple of variables I did not need, but you can add them back. Key was to delete ' UITableViewDataSource ' (you do not conform to this) and to unwrap the optional cell the way you wrote it. I prefer not to construct the cell that way, but that is another discussion. If you still have issues let me know.

import UIKit

class FirstViewController: UIViewController, UITableViewDelegate {

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

//UIViewTableDataSource
func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int{
    return 1
}


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

        let cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier:
            "test")!

        return cell
       }

}

Answer 2

As I wrote in the comments you might as well change the class to a UITableViewController subclass as it is basically the same as UIViewController + UITableViewDelegate + UITableViewDataSource (with a little bit of extra functionality included if you want it). It also has a UITableView property included "out of the box".

You will then end up with the following class:

class FirstViewController: UITableViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    //UIViewTableDataSource
    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
        return taskMGR.tasks.count
    }


    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell{
            let cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier:"test")
            cell.textLabel?.text = taskMGR.tasks[indexPath.row].name // You can remove ? when updating to XCode 6.1 / Swift 1.1
            cell.detailTextLabel?.text = taskMGR.tasks[indexPath.row].desc
            return cell
    }
}