如何从另一个Swift文件传输ViewTable的数据源？

Question

I know this may sound very stupid, i've been trying for hours but couldn't figure out how. How do I load the titles to the tableView in this scenario?

I know there is an easy method where you can declare an array in the ViewController.swift file and make the delegate and datasource = self like this:

self.drugsTableView.dataSource = self
self.drugsTableView.delegate = self

But in this case i would like to get the tableView datasource from another swift file, here is how my scenario is going:

In the project navigator i have the following files:

1. ViewController.swift

2. DrugsLibrary.swift

3. DrugList.swift

ViewController.swift

import UIKit

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

@IBOutlet weak var drugsTableView: UITableView!

var drugList: DrugsLibraryStruct?

override func viewDidLoad() {
    super.viewDidLoad()
    self.drugsTableView.dataSource = self
    self.drugsTableView.delegate = self
    self.navigationItem.title = "Titles"

}


func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return DrugsLibraryStruct().drugsLibraryDictionary.count
}

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

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

DrugsLibrary.swift :

import Foundation

struct DrugsLibraryStruct {

let drugsLibraryDictionary = [
    [
        "name": "Drug A",
        "subtitle": "Drug A subtitle!",
        "icon": "drugA.pdf"

    ],
    [
        "name": "Drug B",
        "subtitle": "Drug B subtitle",
        "icon": "drugb.pdf"
    ]
]

}

DrugList.swift :

import Foundation
import UIKit

struct DrugListStruct {

var name: String?
var subtitle: String?
var icon: UIImage?

init(index: Int) {

    let drugsLibrary = DrugsLibraryStruct().drugsLibraryDictionary
    let drugListDictionary = drugsLibrary[index]

    name = drugListDictionary["name"] as String!
    subtitle = drugListDictionary["subtitle"] as String!

    let iconName = drugListDictionary["icon"] as String!
    icon = UIImage(named: iconName)
}

}

Here is the source code on Dropbox

I would really appreciate your hints or help.

Thank you!

Answer 1

Just create another file.

class DataSource: NSObject {

    lazy var list ... //your data here
}

extension DataSource: UITableViewDataSource {
    //method here
}

extension DataSource: UITableViewDelegate {
    //method here
}

and in your ViewController:

let dataSource = DataSource()

drugsTableView.dataSource = dataSource
drugsTableView.delegate = dataSource

Brace yourself, it will get tricky when you use UITableViewDelegate :)

---

Since you're new, I update my answer with more details.

lazy var list is your dataArray , you can remove the lazy part. I leave it there because I don't display my table immediately, so I don't query it until it's needed.

In your case, just use: var myArray = ...

extension DataSource: UITableViewDataSource {
    func tableView - numberOfRowsInsection (your method above)
    func tableView - cellForRowAtIndexPath (your method above)
    //these methods are required, since they're needed for display data on table
}

extension DataSource: UITableViewDelegate {
    //methods which will be called when you interact with the table
    func tableView - didSelectRowAtIndexPath ...
}

I don't have Xcode here, so find these methods yourself :)

If you want to use the UITableViewDelegate , you have to create a protocol, which is called inside these UITableViewDelegate 's methods and delegate them back to your controller :)

Answer 2

I finally had it working, I used your code as a hint but I had to use a different code. Here's the code:

class Datasource: NSData, UITableViewDataSource, UITableViewDelegate {

let itemsArray = ["Item 1","Item 2","Item 3","Item 4"]


func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return itemsArray.count
}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier:"test")
    cell.textLabel!.text = self.itemsArray[indexPath.row]

    return cell
}

}