ios – 如何从Swift中的viewController类中分离dataSource和delegate？

我正在尝试从viewController中分离datasource和delegate,以防止viewController变得混乱.我通读了一些帖子,发现我可以像下面一样分开datasource,创建一个表示datasource的类：

import UIKit

class Datasource: NSObject,UITableViewDatasource,UITableViewDelegate {

    var movies = [String]()

    //MARK: - UITableViewDatasource
    func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return 1
    }

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

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

        let cell = tableView.dequeueReusableCellWithIdentifier("cellIdentifier",forIndexPath: indexPath) as UITableViewCell


        cell.textLabel?.text =  movies[indexPath.row]

        return cell
    }

}

我的问题是：如果我想在Datasource类中使用属​​性或调用viewController类的方法,我该怎么办？例如,我想在用户选择单元格时调用presentViewController：

func tableView(collectionView: UICollectionView,didSELEctItemATindexPath indexPath: NSIndexPath) {

    //do something here

    presentViewController(viewController!,animated: true,completion: nil)
}

class Datasource: NSObject,UITableViewDelegate {

        var movies = [String]()
        private var SELEctedCallBACk = ((NSIndexPath)->Void)?

        func SELEctedItemATindex(callBACk:(NSIndexPath) -> Void) {
            SELEctedCallBACk = callBACk
        }
}

func tableView(collectionView: UICollectionView,didSELEctItemATindexPath indexPath: NSIndexPath) {

    //do something here

    if let callBACk = SELEctedCallBACk {
       callBACk(indexPath)
    }
}

datasource.SELEctedItemATindex() {
  [weak self] indexPath in
  // do something ...
  // presentViewController(viewController!,completion: nil)
}