I have a collection view with different category cell. When tap one of this I'd like to load all recipes with that category.
I have two class:
a. CategoryModel - to manage the category
class CategoryModel: NSObject, NSCoding
{
var nameCategory: String
var iconCategory: UIImage
var recipes = [RecipeModel]()
b. RecipeModel
class RecipeModel: NSObject, NSCoding
{
var nameRecipe: String
var quantityRecipe: String
var recipeTime: String
var preparationTime: String
var cookingTime: String
var bakingTempRecipe: String
var difficultyLevelRecipe: String
var imageRecipe: UIImage
var ingredients: [IngredientModel]
var directions: [DirectionModel]
var categoryRecipe: String
I suppose to insert someone in the CategoryCollViewController when I selected the one of all categories... but I don't know to do it!
Someone help me, please!
RecipeCollViewcontroller
class RecipeCollViewController: UICollectionViewController, UITextFieldDelegate
{
var category: CategoryModel!
var recipesList = [RecipeModel]()
struct Storyboard
{
static let leftAndRightPaddings: CGFloat = 2.0
static let numberOfItemsPerRow: CGFloat = 2.0
}
override func viewDidLoad()
{
super.viewDidLoad()
longPressGesture()
RecipeDataManager.shared.recipeController = self
title = category.nameCategory
navigationController?.navigationBar.prefersLargeTitles = true
let collectionViewWidth = collectionView?.frame.width
let itemWidth = (collectionViewWidth! - Storyboard.leftAndRightPaddings) / Storyboard.numberOfItemsPerRow
let layout = collectionViewLayout as! UICollectionViewFlowLayout
layout.itemSize = CGSize(width: itemWidth, height: 250)
}
override func numberOfSections(in collectionView: UICollectionView) -> Int
{
return 1
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
{
return category.recipesList.count
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
{
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "RecipeCell", for: indexPath) as! RecipeViewCell
let recipe = category.recipesList[indexPath.item]
cell.labelNameRecipe.text = recipe.nameRecipe
cell.imageViewRecipe.image = recipe.imageRecipe
cell.labelPrepareTime.text = String(recipe.recipeTimeInt)
cell.labelQuantityFor.text = recipe.quantityRecipe
return cell
}
override func collectionView(_ collectionView: UICollectionView, performAction action: Selector, forItemAt indexPath: IndexPath, withSender sender: Any?) {
RecipeDataManager.shared.recipes.remove(at: indexPath.row)
collectionView.deleteItems(at: [indexPath])
}
Declare ** recipesList** in the next screen's ViewController.
var recipesList = [RecipeModel]()
Now in your categoryViewController, implement this CollectionViewDelegate method
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let vc=self.storyboard?.instantiateViewController(withIdentifier: "YourViewControllerIdentifier") as? YourViewControllerClass
recipesList = self.categoryList[indexPath.row].recipes
self.navigationController?.pushViewController(vc!, animated: true)
}
Access your recipes array from ** var recipesList** from declared earlier
Related
I am trying this for a couple of days now and haven't achieved anything yet. What I am trying to do is when a user picks a User item form the ViewController class, I want to save it in Realm and show it in the CollectionView of the SavedInterestsViewController class. I use a delegate pattern as suggested in this post How to access and refresh a UITableView from another class in Swift, but unfortunately I still receive nil, I guess because the GC removed the collectionView outlet already right? (please correct me if I misunderstood it). However, how can I get this to work by using a delegate pattern? Here is my code, this is the class where the user Picks a new User-item:
protocol ViewControllerDelegate {
func didUpdate(sender: ViewController)
}
class ViewController: UIViewController {
#IBOutlet weak var searchBar: UISearchBar!
#IBOutlet weak var collectionView: UICollectionView!
var delegate: ViewControllerDelegate?
let numberOfTweets = 5
let realm = try! Realm()
var image = UIImage()
var imageArray: [String] = []
var userArray: [User] = []
override func viewDidLoad() {
super.viewDidLoad()
collectionView.delegate = self
collectionView.dataSource = self
collectionView.register(UINib(nibName: "CollectionViewCell", bundle: nil), forCellWithReuseIdentifier: "CollectionCell")
searchBar.delegate = self
}
}
extension ViewController: UISearchBarDelegate {
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
print("One second...")
let functionClass = NetworkingFunctions()
var loopCount = 0
functionClass.getWikipediaAssumptions(for: searchBar.text!) { [self] (articleArray) in
self.userArray.removeAll()
for x in articleArray {
functionClass.performWikipediaSearch(with: x, language: WikipediaLanguage("en")) { (user) in
self.userArray.append(user)
collectionView.reloadData()
loopCount += 1
}
}
}
}
}
extension ViewController: UICollectionViewDelegate, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return userArray.count
}
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CollectionCell", for: indexPath) as! CollectionViewCell
let image = UIImage.init(data: userArray[indexPath.item].image as Data)
cell.userImage.image = image
cell.nameLabel.text = userArray[indexPath.item].name
cell.userImage.layer.borderColor = image?.averageColor?.cgColor
if userArray[indexPath.item].checked == false {
cell.checkmark.isHidden = true
} else {
cell.checkmark.isHidden = false
}
return cell
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
if userArray[indexPath.item].checked == false {
userArray[indexPath.item].checked = true
collectionView.reloadData()
let newUser = User()
newUser.image = userArray[indexPath.item].image
newUser.name = userArray[indexPath.item].name
newUser.checked = true
try! realm.write {
realm.add(newUser)
}
self.delegate = SavedInterestsViewController()
self.delegate?.didUpdate(sender: self)
}
else {
userArray[indexPath.item].checked = false
collectionView.reloadData()
}
}
}
extension ViewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let width = UIScreen.main.bounds.width/3 - 10
let height = width
return CGSize(width: width, height: height)
}
}
class User: Object {
#objc dynamic var image: NSData = NSData()
#objc dynamic var name: String = ""
#objc dynamic var checked: Bool = false
}
... and this is the class where I want to show the selected item, after the User clicked on the 'Back' Button of the navigation controller of the ViewController class:
class SavedInterestsViewController: UIViewController, ViewControllerDelegate {
func didUpdate(sender: ViewController) {
DispatchQueue.main.async {
self.collectionView.reloadData()
}
}
#IBOutlet weak var addButton: UIBarButtonItem!
#IBOutlet weak var collectionView: UICollectionView!
let realm = try! Realm()
var userArray: [User] = []
override func viewDidLoad() {
super.viewDidLoad()
collectionView.delegate = self
collectionView.dataSource = self
collectionView.register(UINib(nibName: "CollectionViewCell", bundle: nil), forCellWithReuseIdentifier: "CollectionCell")
fetchDataFromRealm()
}
#IBAction func addButtonPressed(_ sender: UIBarButtonItem) {
performSegue(withIdentifier: "SavedToNew", sender: self)
}
func fetchDataFromRealm() {
userArray.append(contentsOf: realm.objects(User.self))
collectionView.reloadData()
}
}
extension SavedInterestsViewController: UICollectionViewDelegate, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return userArray.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CollectionCell", for: indexPath) as! CollectionViewCell
let image = UIImage.init(data: userArray[indexPath.item].image as Data)
cell.userImage.image = image
cell.nameLabel.text = userArray[indexPath.item].name
cell.userImage.layer.borderColor = image?.averageColor?.cgColor
if userArray[indexPath.item].checked == false {
cell.checkmark.isHidden = true
} else {
cell.checkmark.isHidden = false
}
return cell
}
}
extension SavedInterestsViewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let width = UIScreen.main.bounds.width/3 - 10
let height = width
return CGSize(width: width, height: height)
}
}
in your code you have lines
self.delegate = SavedInterestsViewController()
self.delegate?.didUpdate(sender: self)
but it do mostly nothing - you set the delegate to newly created class, didUpdate it - but I don't see any use of it - you don't present it in any way.
If I understand you right - you have SavedInterestsViewController, from it - you open ViewController, do something and when back to SavedInterestsViewController. (I can be wrong with your flow - correct me if so)
In this flow - you have delegate property in ViewController, but it must be of type SavedInterestsViewController. And you have to set it to SavedInterestsViewController when you open ViewController from it. And later in ViewController you have to call didUpdate method of delegate.
I have a mini game in Single-view-app project with item inventory (CollectionView). Its structure in main.Storyboard: CollectionView -> cell -> ContentView -> inventoryImageView. When the game starts items.count of empty cells are generated. Whenever a user taps on imageView of an item he finds, I want this imageView to populate the most left and available cell of the inventory. Something like:
cell.inventoryImageView = itemImageView
How can I access this left unpopulated cell?
The code is:
struct Items {
let imageName: String
var location = (0, 0)
}
var key = Items(imageName: "icons8-key-50")
var chest = Items(imageName: "icons8-closed-treasure-chest-50")
var rock = Items(imageName: "icons8-rock-50")
var bone = Items(imageName: "icons8-human-bone-50")
var mushroom = Items(imageName: "icons8-mushroom-50")
var items = [Items]()
override func viewDidLoad() {
items = [key, chest, rock, bone, mushroom]
}
when user clicks Start button this func gets triggered for every item :
func createItems(imageName: String) {
let imageNamePNG = "\(imageName).png"
let itemImage = UIImage(named: imageNamePNG)
let itemImageView = UIImageView(image: itemImage) itemImageView.frame = CGRect(x: 70, y: 0, width: 63, height: 63)
itemImageView.frame = CGRect(x: Int.random(in: 70...294), y: Int.random(in: 100...543), width: 63, height: 63)
view.addSubview(itemImageView)
createdImages.append(itemImageView)
}
cell creation part:
// MARK: - UICollectionViewDataSource protocol
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return self.items.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath as IndexPath) as! CollectionViewCell
return cell
}
I don't quite understand what you want to do but I hope this code could help you.
CustomCollectionViewCell.swift
import UIKit
class CustomCollectionViewCell: UICollectionViewCell {
#IBOutlet weak var inventoryImageView: UIImageView!
}
ViewController.swift
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var collectionView: UICollectionView!
#IBOutlet weak var imageButton: UIButton!
var key = Items(imageName: "img-1")
var chest = Items(imageName: "img-2")
var rock = Items(imageName: "img-3")
var bone = Items(imageName: "img-4")
var mushroom = Items(imageName: "img-5")
var items = [Items]()
var index = 0
var createdImages = [Items]()
override func viewDidLoad() {
super.viewDidLoad()
self.items = [key, chest, rock, bone, mushroom]
self.imageButton.setImage(UIImage(named: self.items[index].imageName), for: .normal)
}
#IBAction func imageButtonAction(_ sender: Any) {
index += 1
if index >= items.count{
index = 0
}
self.imageButton.setImage(UIImage(named: self.items[index].imageName), for: .normal)
self.createdImages.append(self.items[index])
self.collectionView.reloadData()
}
}
extension ViewController: UICollectionViewDataSource, UICollectionViewDelegate {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return self.createdImages.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CustomCollectionViewCell
cell.inventoryImageView.image = UIImage(named: self.createdImages[indexPath.item].imageName)
return cell
}
}
Items.swift
struct Items {
let imageName: String
var location = (0, 0)
}
Firstly, I know there are options for using SwiftUI Lists etc... to get similar effects. But I need the automatic scrolling capabilities of a UICollectionView so I'd really like to just implement an "old school" version. I don't even want the compositional layout version ideally.
My current code looks like this:
import SwiftUI
struct CollectionView: UIViewControllerRepresentable {
private var isActive: Binding<Bool>
private let viewController = UIViewController()
private let collectionController: UICollectionView
init(_ isActive: Binding<Bool>) {
self.isActive = isActive
self.collectionController = UICollectionView(frame: CGRect(x: 0, y: 0, width: 100, height: 200), collectionViewLayout: UICollectionViewFlowLayout())
}
func makeUIViewController(context: UIViewControllerRepresentableContext<CollectionView>) -> UIViewController {
return viewController
}
func updateUIViewController(_ uiViewController: UIViewController, context: UIViewControllerRepresentableContext<CollectionView>) {
if self.isActive.wrappedValue && collectionController.delegate == nil { // to not show twice
collectionController.delegate = context.coordinator
collectionController.dataSource = context.coordinator
}
}
func makeCoordinator() -> Coordintor {
return Coordintor(owner: self)
}
final class Coordintor: NSObject, UICollectionViewDelegate, UICollectionViewDataSource {
weak var viewController:UIViewController?
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 3
}
var cellId = "Cell"
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath)
return cell
}
// works as delegate
let owner: CollectionView
init(owner: CollectionView) {
self.owner = owner
}
}
}
Unfortunately, all I get is a blank screen in the preview. For now if I can just display a big selection of red squares which I can scroll through and auto scroll to the bottom onAppear, that would be ideal.
Thanks!
Here is minimal runnable demo. (Note: Cell have to be registered if all is done programmatically)
class MyCell: UICollectionViewCell {
}
struct CollectionView: UIViewRepresentable {
func makeUIView(context: Context) -> UICollectionView {
let view = UICollectionView(frame: .zero, collectionViewLayout: UICollectionViewFlowLayout())
view.backgroundColor = UIColor.clear
view.dataSource = context.coordinator
view.register(MyCell.self, forCellWithReuseIdentifier: "myCell")
return view
}
func updateUIView(_ uiView: UICollectionView, context: Context) {
}
func makeCoordinator() -> Coordinator {
Coordinator()
}
class Coordinator: NSObject, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
3
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "myCell", for: indexPath) as! MyCell
cell.backgroundColor = UIColor.red
return cell
}
}
}
struct TestUICollectionView_Previews: PreviewProvider {
static var previews: some View {
CollectionView()
}
}
I'm trying to implement flip animation in UICollectionViewCell. I have done it with 2 types of images. But I don't know how to implement it in array of images. The logic now:
but I want logic like this:
this is my code:
import UIKit
class CollectionViewCell: UICollectionViewCell {
#IBOutlet weak var coImage: UIImageView!
let cardBackTag = 0
let cardFrontTag = 1
var cardViews: (frontView: UIImageView, backView: UIImageView)?
var imgViewFront: UIImageView!
var imgViewBack: UIImageView!
override func awakeFromNib() {
super.awakeFromNib()
imgViewFront = self.createCardWithImage(imageName: "1", tag: self.cardFrontTag)
imgViewBack = self.createCardWithImage(imageName: "2", tag: self.cardBackTag)
cardViews = (frontView: imgViewFront, backView: imgViewBack)
contentView.addSubview(imgViewBack)
}
private func createCardWithImage(imageName: String, tag: Int) -> UIImageView {
let newCardImageView = UIImageView(frame: self.frame)
newCardImageView.image = UIImage(named: imageName)
newCardImageView.tag = tag
return newCardImageView
}
func flipCardAnimation(indexPath: IndexPath) {
if (imgViewBack.superview != nil) {
cardViews = (frontView: imgViewFront, backView: imgViewBack)
}else{
cardViews = (frontView: imgViewBack, backView: imgViewFront)
}
let transitionOptions = UIViewAnimationOptions.transitionFlipFromLeft
UIView.transition(with: self.contentView, duration: 1.0, options: transitionOptions, animations: {
self.cardViews!.backView.removeFromSuperview()
self.contentView.addSubview(self.cardViews!.frontView)
}, completion: { finished in
print(indexPath)
})
}
}
and
import UIKit
class CollectionViewController: UICollectionViewController {
var reuseIdentifier = "CollectionViewCell"
override func viewDidLoad() {
super.viewDidLoad()
self.collectionView!.register(UINib(nibName: "CollectionViewCell", bundle: nil), forCellWithReuseIdentifier: reuseIdentifier)
}
// MARK: UICollectionViewDataSource
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 8
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CollectionViewCell
return cell
}
override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let cell = collectionView.cellForItem(at: indexPath) as! CollectionViewCell
cell.flipCardAnimation(indexPath: indexPath)
}
}
Please, help me to implement this logic! Thank you a lot!!
i have a collection view which has an array of images. when i press on any of the images it will open that image in full screen in another class. i tried to add swipe gesture recognizer in the second view controller but i dont know how to access the array that is in the first view controller.
This is my first view controller that displays the images in collection view
class sowrController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource{
#IBOutlet weak var collectionView: UICollectionView!
var albums = [AlbumModel]()
let db : DBHelperMo2lfat = DBHelperMo2lfat()
var selectedIndex : Int = -1
var posts : Post!
override func viewDidLoad() {
super.viewDidLoad()
collectionView.delegate = self
collectionView.dataSource = self
self.albums.removeAll()
self.albums.append(contentsOf: self.db.fetchAllImages())
self.collectionView.reloadData()
DataService.ds.REF_POSTS_SOWR.observe(.value, with: { (snapshot) in
if let snapshot = snapshot.children.allObjects as? [FIRDataSnapshot] {
self.albums.removeAll()
for snap in snapshot {
print ("SNAP: \(snap)")
if let postDict = snap.value as? Dictionary<String, AnyObject>{
let album : AlbumModel = AlbumModel(id: postDict["id"] as! String, name: postDict["image_name"] as! String, path: postDict["image_path"] as! String, url: postDict["image_path"] as! String, localPath: "")
if let items = snap.children.allObjects as? [FIRDataSnapshot] {
for itemSnap in items {
if let albumSnap = itemSnap.value as? Dictionary<String, AnyObject> {
album.childAlbums.append(AlbumModel(id: albumSnap["id"] as! String, name: albumSnap["image_name"] as! String, path: albumSnap["image_path"] as! String, url: albumSnap["image_path"] as! String, localPath: ""))
}
}
}
self.albums.append(album)
}
}
self.collectionView.reloadData()
}
})
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return self.albums.count
}
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if let cell = collectionView.dequeueReusableCell(withReuseIdentifier: Constants.BookCellReuseIdentifier, for: indexPath) as? collectionViewCellSowr {
let album = albums[indexPath.item]
cell.initWithAlbumModel(album: album)
return cell
}else {
return collectionViewCellSowr()
}
}
private struct Constants {
static let BookCellReuseIdentifier = "cell"
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
self.selectedIndex = indexPath.row
self.performSegue(withIdentifier: "showAlbum", sender: self)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?)
{
if segue.identifier == "showAlbum"
{
let vc = segue.destination as! imageFullScreen
vc.images = self.albums[self.selectedIndex]
}
}
This is the second view controller that makes the images go in full screen
class imageFullScreen: UIViewController{
var images : AlbumModel?
let db : DBHelperMo2lfat = DBHelperMo2lfat()
#IBAction func pictureSwipe(_ sender: Any) {
}
#IBOutlet weak var caption: UILabel!
#IBOutlet weak var imageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
self.caption.text = images?.imageName
let url = URL(string: (images?.imagePath)!)
self.imageView.sd_setImage(with: url, placeholderImage: nil, options: [.progressiveDownload,.retryFailed])
}
EDIT:
Ok, so here is a collection view controller that creates image view as a subview and responding to swipe gestures. Please make sure you have two images "Image" and "Image-1" in your assets folder.
//
// CollectionViewController.swift
// test
//
// Created by Yonatan Vainer on 05/08/2017.
// Copyright © 2017 Sensus Healthcare LLC. All rights reserved.
//
import UIKit
private let reuseIdentifier = "id"
class CollectionViewController: UICollectionViewController {
var imageView = UIImageView(frame: CGRect(x: 0, y: 100, width: 300, height: 300))
var index = 0;
let names = ["Image","Image-1"]
override func viewDidLoad() {
super.viewDidLoad()
//For left swipe
let left = UISwipeGestureRecognizer(target: self, action: #selector(self.goLeft(_:)))
left.direction = .left
imageView.addGestureRecognizer(left)
//For right swipe
let right = UISwipeGestureRecognizer(target: self, action: #selector(self.goRight(_:)))
right.direction = .right
imageView.addGestureRecognizer(right)
imageView.isUserInteractionEnabled = true
self.view.addSubview(imageView)
self.view.layoutSubviews()
// Uncomment the following line to preserve selection between presentations
// self.clearsSelectionOnViewWillAppear = false
// Register cell classes
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
// MARK: UICollectionViewDataSource
override func numberOfSections(in collectionView: UICollectionView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of items
return names.count
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath)
// Configure the cell
let nail = UIImageView(frame: CGRect(x: 0, y: 0, width: 50, height: 50))
nail.image = UIImage(named: names[indexPath.row])
cell.backgroundView = nail
return cell
}
override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
imageView.image = UIImage(named: names[indexPath.row])
index = indexPath.row
}
func goLeft(_ gesture: UISwipeGestureRecognizer){
index += 1
if index<0{
index = 0
}
imageView.image = UIImage(named: names[index])
}
func goRight(_ gesture: UISwipeGestureRecognizer){
index -= 1
if index>1{
index = 1
}
imageView.image = UIImage(named: names[index])
}
// MARK: UICollectionViewDelegate
/*
// Uncomment this method to specify if the specified item should be highlighted during tracking
override func collectionView(_ collectionView: UICollectionView, shouldHighlightItemAt indexPath: IndexPath) -> Bool {
return true
}
*/
/*
// Uncomment this method to specify if the specified item should be selected
override func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool {
return true
}
*/
/*
// Uncomment these methods to specify if an action menu should be displayed for the specified item, and react to actions performed on the item
override func collectionView(_ collectionView: UICollectionView, shouldShowMenuForItemAt indexPath: IndexPath) -> Bool {
return false
}
override func collectionView(_ collectionView: UICollectionView, canPerformAction action: Selector, forItemAt indexPath: IndexPath, withSender sender: Any?) -> Bool {
return false
}
override func collectionView(_ collectionView: UICollectionView, performAction action: Selector, forItemAt indexPath: IndexPath, withSender sender: Any?) {
}
*/
}
==================================================================
In storyboard, click on your collection view and embed navigation controller.
This will add a top bar with the back button.
Attached image.
I'm not sure I completely understand your question, because I don't understand what the array has to do with a gesture recognizer, but if you are just trying to access the array from the previous ViewController, this should work if you have a navigation controller :
let vcIndex = self.navigationController?.viewControllers.index(where: { (viewController) -> Bool in
if let _ = viewController as? sowrController {
return true
}
return false
})
let prevVC = self.navigationController?.viewControllers[vcIndex!] as! sowrController
let albums:[AlbumModel] = prevVC.albums