navigate on click of collectionview cell inside tableview - ios

Question

I have a tableview cell inside which i have added collectionview cell ( for horizontal scrolling).
Now i want to push to other navigation controller on pressing any cell of horizontal collectionview. How to do it ? Or how can i define delegate methods for cell press.
Code :
ViewController.swift :
class ViewController: UIViewController {
var categories = ["Action", "Drama", "Science Fiction", "Kids", "Horror"]
}
extension ViewController : UITableViewDelegate { }
extension ViewController : UITableViewDataSource {
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
return categories[section]
}
func numberOfSections(in tableView: UITableView) -> Int {
return categories.count
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 1
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! CategoryRow
return cell
}
}
CategoryRow.swift
class CategoryRow : UITableViewCell {
#IBOutlet weak var collectionView: UICollectionView!
}
extension CategoryRow : UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 12
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "videoCell", for: indexPath) as! VideoCell
return cell
}
}
extension CategoryRow : UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let itemsPerRow:CGFloat = 4
let hardCodedPadding:CGFloat = 5
let itemWidth = (collectionView.bounds.width / itemsPerRow) - hardCodedPadding
let itemHeight = collectionView.bounds.height - (2 * hardCodedPadding)
return CGSize(width: itemWidth, height: itemHeight)
}
}
VideoCell.swift
class VideoCell : UICollectionViewCell {
#IBOutlet weak var imageView: UIImageView!
}

Answer 1

Here you will get the cell click at the delegate method didSelectItemAtIndexPath on CategoryRow class and from there you can fire a delegate to get call inside ViewController
ViewController.swift :
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! CategoryRow
cell.delegate = self
return cell
}
VideoCell.swift :
protocol CategoryRowDelegate:class {
func cellTapped()
}
CategoryRow.swift :
class CategoryRow : UITableViewCell {
weak var delegate:CategoryRowDelegate?
#IBOutlet weak var collectionView: UICollectionView!
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
if delegate!= nil {
delegate?.cellTapped()
}
}
Add the delegate function inside ViewController
func cellTapped(){
//code for navigation
}

Answer 2

First create protocol for delegation from CategoryRow.swift like below code
protocol CollectionViewSelectionDelegate: class {
func didSelectedCollectionViewItem(selectedObject: AnyObject)
}
Now create delegate object on VideoCell.swift like below
weak var delegate:CollectionViewSelectionDelegate?
Change ViewController.swift code before return cell
cell?.delegate = self
Override method of delegate in ViewController.swift and call similar method from VideoCell.swift from UICollectionView Delegate method.

Answer 3

I think its better to use Notification in this case.
post a notification in didSelectItem of collection view
NSNotificationCenter.defaultCenter().postNotificationName(notificationIdentifier, object: nil)
and add an observer in viewController viewDidLoad as follows
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(pushToNew(_:)), name: notificationIdentifier, object: nil)
in the new pushToNew function, perform your segue
func pushToNew(notification: Notification) {
// perform your segue here. Navigate to next view controller
}

Answer 4

Make a protocol
protocol collectionViewCellClicked{
func cellClicked()
}
Implement this protocol in main View Controller Your View Controller look like this
class ViewController: UITableViewController, collectionViewCellClicked{ func cellClicked(){ // Your Code }}
Your cellForRowAt delegate look like this
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: <#T##String#>, for: <#T##IndexPath#>)
cell.delegate = self
return cell
}
In your Table View Cell Make a variable of type collectionViewCellClicked
var delegate: collectionViewCellClicked?
and in your didSelectItemAt delegate
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
delegate.cellClicked()
}