How to navigate to another view controller from datasource class - swift

Question

I have a UIViewController with a UITableView. I have separate class for UITableViewDataSource and UITableViewDelegate. How can I navigate to another view controller when a cell is selected?
class ViewController: UIViewController {
let tableView = UITableView()
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = TableViewDataSource()
}
}
class TableViewDataSource: UITableViewDataSource, UITableViewDelegate {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
//
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
//
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
//How to push SecondVC from Viewcontroller?
}
}

Answer 1

class TableViewDataSource: UITableViewDataSource, UITableViewDelegate {
var parentViewController : UIViewController?
func init(parentController : UIViewController){
self.parentViewController = parentController
}
// rest of your code
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
//How to push SecondVC from Viewcontroller?
let storyboard = UIStoryboard(name: "Stroybaordname", bundle: nil)
let secondVC = storyboard.instantiateViewController(withIdentifier: "ViewControllerName")
parentViewController.present(secondVC, animated: true, completion: nil)
}
}
Try this way

Answer 2

If I had to do this I would do it using a separate delegate method. If I am missing the context pardon me.
class ViewController: UIViewController, TableViewDataSourceDelegate {
let tableView = UITableView()
override func viewDidLoad() {
super.viewDidLoad()
let customTableDataSource = TableViewDataSource()
customTableDataSource.delegate = self
// Setting the custom delegate
tableView.delegate = customTableDataSource
}
func cellSelected(at: IndexPath) {
// Navigate from here.
}
}
/// Protocol helps to communicate with the TableViewDataSource to the user of it.
protocol TableViewDataSourceDelegate {
func cellSelected(at: IndexPath)
}
class TableViewDataSource: UITableViewDataSource, UITableViewDelegate {
var delegate: TableViewDataSourceDelegate?
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 0
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
return UITableViewCell()
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
delegate?.cellSelected(at: indexPath)
}
}

Answer 3

You can create a blocks to access it in your ViewController class.
//MARK:- MODULES
import UIKit
//MARK:- TYPEALIAS
typealias ListCellConfigureBlock = (_ cell : AnyObject? , _ item : AnyObject? , _ indexpath: IndexPath?) -> ()
typealias DidSelectedRow = (_ indexPath : IndexPath) -> ()
typealias ScrollViewDidScroll = (_ scrollView : UIScrollView) -> ()
typealias ViewForHeaderInSection = (_ section : Int) -> UIView?
typealias DidDeselectedRow = (_ indexPath : IndexPath) -> ()
typealias CanEditRowAt = (_ indexPath : IndexPath) -> Bool
typealias CommitEditingStyle = (_ commiteditingStyle: UITableViewCellEditingStyle, _ indexPath : IndexPath) -> ()
typealias HeightForRowAt = (_ indexPath : IndexPath) -> CGFloat
//MARK:- CLASS
class TableViewDataSource: NSObject {
//MARK:- PROPERTIES
var _section: [String]?
var sectionCount: Array<AnyObject>?
var rowCount : Array<AnyObject>?
var cellIdentifier : String?
var tableView : UITableView?
var configureCellBlock : ListCellConfigureBlock?
var aRowSelectedListener : DidSelectedRow?
var ScrollViewListener : ScrollViewDidScroll?
var viewforHeaderInSection : ViewForHeaderInSection?
var headerHeight : CGFloat?
var aRowDeselectedListener : DidDeselectedRow?
var aRowEditListener : CanEditRowAt?
var aRowCommitListener : CommitEditingStyle?
var aRowHeightListener : HeightForRowAt?
init (tableView : UITableView?, cellIdentifier : String?, sectionCount: Array<AnyObject>?, rowCount : Array<AnyObject>? , height : HeightForRowAt? , configureCellBlock : ListCellConfigureBlock? , aRowSelectedListener : #escaping DidSelectedRow,aRowDeselectedListener: #escaping DidDeselectedRow ,aRowCommitListener: #escaping CommitEditingStyle, DidScrollListener : ScrollViewDidScroll?) {
self.tableView = tableView
self.sectionCount = sectionCount
self.rowCount = rowCount
self.cellIdentifier = cellIdentifier
self.aRowHeightListener = height
self.configureCellBlock = configureCellBlock
self.aRowSelectedListener = aRowSelectedListener
self.aRowDeselectedListener = aRowDeselectedListener
self.aRowCommitListener = aRowCommitListener
self.ScrollViewListener = DidScrollListener
}
override init() {
super.init()
}
}
//MARK:- DELEGATE, DATASOURCE
extension TableViewDataSource : UITableViewDelegate , UITableViewDataSource{
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let identifier = cellIdentifier else { fatalError("Cell identifier not provided") }
let cell: UITableViewCell = tableView.dequeueReusableCell(withIdentifier: identifier , for: indexPath) as UITableViewCell
cell.selectionStyle = UITableViewCellSelectionStyle.none
if let block = self.configureCellBlock , let item: AnyObject = self.rowCount?[(indexPath as NSIndexPath).row]{
block(cell , item , indexPath as IndexPath?)
}
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
if let block = self.aRowSelectedListener{
block(indexPath)
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.rowCount?.count ?? 0
}
func numberOfSections(in tableView: UITableView) -> Int {
return self.sectionCount?.count ?? 0
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
guard let block = self.aRowHeightListener else { return 0.0 }
return block(indexPath)
}
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
guard let block = viewforHeaderInSection else { return nil }
return block(section)
}
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
return self._section?[section]
}
func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
return headerHeight ?? 0.0
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
if let block = self.ScrollViewListener{
block(scrollView)
}
}
func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
if let block = self.aRowDeselectedListener {
block(indexPath)
}
}
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
guard let block = self.aRowEditListener else { return false }
return block(indexPath)
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if let block = self.aRowCommitListener{
block(editingStyle, indexPath)
}
}
}
You can use it like:
//Create a variable:
var dataSource = TableViewDataSource()
fileprivate func setUpDataSource() throws {
DispatchQueue.main.async { [weak self] in
dataSource = TableViewDataSource.init(tableView: tblView, cellIdentifier: CellId.chatUserTVCell.rV, sectionCount: arrSection as Array<AnyObject>, rowCount: arrSearchChatListing , height: { (indexPath) -> CGFloat in
return 80.0
}, configureCellBlock: { (cell, item, indexPath) in
guard let _cell = cell as? ChatUserTableCell, let _item = item as? ChatListing, let row = indexPath?.row else { return }
_cell.chatListing = _item
try? self?.shouldRequestPaging(row: row)
}, aRowSelectedListener: { (indexPath) in
let vc = StoryboardScene.Home.instantiateChatTextController()
try? self?.pushVC(vc)
}, aRowDeselectedListener: { (indexPath) in
debugPrint("Deselected")
}, aRowCommitListener: { (editingStyle, indexPath) in
debugPrint("aRowCommitListener")
}, DidScrollListener: { (scrollView) in
debugPrint("DidScrollListener")
})
tblView.delegate = dataSource
tblView.dataSource = dataSource
tblView.reloadData()
}
}
Hope it helps :)