Perform Segue from UICollectionViewCell - ios

Question

So I'm creating a blog app, and on the home news feed collection view (imageCollection, loaded from firebase database) I have a button. This button title depends on the Category of the image. What i'm having an issue with is performing the segue in the UICollectionViewCell class. I ran the button action with the print statement, and it worked. But when i try to add performSegue, well it doesn't let me. (Use of unresolved identifier 'performSegue')
Any tips? thank you!
P.S. i'm still fairly new to swift, so if i come off a little ignorant, i apologize
My ViewController
import UIKit
import Firebase
import FirebaseDatabase
import SDWebImage
class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {
#IBOutlet weak var popImageCollection: UICollectionView!
#IBOutlet weak var imageCollection: UICollectionView!
var customImageFlowLayout = CustomImageFlowLayout()
var popImageFlowLayout = PopImagesFlowLayout()
var images = [BlogInsta]()
var popImageArray = [UIImage]()
var homePageTextArray = [NewsTextModel]()
var dbRef: DatabaseReference!
var dbPopularRef: DatabaseReference!
override func viewDidLoad() {
super.viewDidLoad()
dbRef = Database.database().reference().child("images")
dbPopularRef = Database.database().reference().child("popular")
loadDB()
loadImages()
loadText()
customImageFlowLayout = CustomImageFlowLayout()
popImageFlowLayout = PopImagesFlowLayout()
imageCollection.backgroundColor = .white
popImageCollection.backgroundColor = .white
// Do any additional setup after loading the view, typically from a nib.
}
func loadText() {
dbRef.observe(DataEventType.value, with: { (snapshot) in
if snapshot.childrenCount > 0 {
self.homePageTextArray.removeAll()
for homeText in snapshot.children.allObjects as! [DataSnapshot] {
let homeTextObject = homeText.value as? [String: AnyObject]
let titleHome = homeTextObject?["title"]
let categoryButtonText = homeTextObject?["category"]
self.imageCollection.reloadData()
let homeLabels = NewsTextModel(title: titleHome as! String?, buttonText: categoryButtonText as! String?)
self.homePageTextArray.append(homeLabels)
}
}
})
}
func loadImages() {
popImageArray.append(UIImage(named: "2")!)
popImageArray.append(UIImage(named: "3")!)
popImageArray.append(UIImage(named: "4")!)
self.popImageCollection.reloadData()
}
func loadDB() {
dbRef.observe(DataEventType.value, with: { (snapshot) in
var newImages = [BlogInsta]()
for BlogInstaSnapshot in snapshot.children {
let blogInstaObject = BlogInsta(snapshot: BlogInstaSnapshot as! DataSnapshot)
newImages.append(blogInstaObject)
}
self.images = newImages
self.imageCollection.reloadData()
})
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if collectionView == self.imageCollection {
return images.count
} else {
return popImageArray.count
}
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if collectionView == self.imageCollection {
let cell = imageCollection.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! ImageCollectionViewCell
let image = images[indexPath.row]
let text: NewsTextModel
text = homePageTextArray[indexPath.row]
cell.categoryButton.setTitle(text.buttonText, for: .normal)
cell.newTitleLabel.text = text.title
cell.imageView.sd_setImage(with: URL(string: image.url), placeholderImage: UIImage(named: "1"))
return cell
} else {
let cellB = popImageCollection.dequeueReusableCell(withReuseIdentifier: "popCell", for: indexPath) as! PopularCollectionViewCell
let popPhotos = popImageArray[indexPath.row]
cellB.popularImageView.image = popPhotos
cellB.popularImageView.frame.size.width = view.frame.size.width
return cellB
}
}
}
My ImageCollectionViewCell.swift
import UIKit
import Foundation
class ImageCollectionViewCell: UICollectionViewCell {
#IBOutlet weak var categoryButton: UIButton!
#IBOutlet weak var newTitleLabel: UILabel!
#IBOutlet weak var imageView: UIImageView!
#IBAction func categoryButtonAction(_ sender: Any) {
if categoryButton.currentTitle == "Fashion" {
print("Fashion Button Clicked")
performSegue(withIdentifier: "homeToFashion", sender: self)
}
}
override func prepareForReuse() {
super.prepareForReuse()
self.imageView.image = nil
}
}

Answer 1

You need a custom delegate. Do this:
protocol MyCellDelegate {
func cellWasPressed()
}
// Your cell
class ImageCollectionViewCell: UICollectionViewCell {
var delegate: MyCellDelegate?
#IBAction func categoryButtonAction(_ sender: Any) {
if categoryButton.currentTitle == "Fashion" {
print("Fashion Button Clicked")
self.delegate?.cellWasPressed()
}
}
}
// Your viewcontroller must conform to the delegate
class ViewController: MyCellDelegate {
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if collectionView == self.imageCollection {
let cell = imageCollection.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! ImageCollectionViewCell
// set the delegate
cell.delegate = self
// ...... rest of your cellForRowAtIndexPath
}
// Still in your VC, implement the delegate method
func cellWasPressed() {
performSegue(withIdentifier: "homeToFashion", sender: self)
}
}

Answer 2

You should use your own delegate. It is already described here
performSegue(withIdentifier:sender:) won't work from cell because it is UIViewController metod.
also you can make use of closure