I am passing some data from my ViewController to a UITableViewCell
Code in my VC :
protocol homeVCdelegate {
func getDeviceData(_ controller : HomeViewController, deviceData : [device])
}
Registered the cell in my VC :
shortcutTable.delegate = self
shortcutTable.dataSource = self
shortcutTable.register(UINib(nibName: "shortcutCell", bundle: nil), forCellReuseIdentifier: "shortcutCell")
Declared Delegate in my VC :
var delegate : homeVCdelegate?
Calling delegate method inside a API Call :
DispatchQueue.main.async {
self.allDevices = finalData2.owndevices + finalData2.deldevices
self.allDevices = self.allDevices.sorted(by: {$0.givenName.lowercased() < $1.givenName.lowercased()})
self.delegate?.getDeviceData(self, deviceData: self.allDevices)
self.shortcutTable.reloadData()
self.sendTopicListSocket(topics: topicList)
}
Code from UITableViewCell :
override func awakeFromNib() {
super.awakeFromNib()
let homeVC = storyboard.instantiateViewController(withIdentifier: "HomeViewController") as? HomeViewController
homeVC!.delegate = self
}
func getDeviceData(_ controller: HomeViewController, deviceData: [device]) {
self.deviceArray = deviceData
self.deviceArray?.forEach({ device in
self.deviceNames?.append(device.name)
self.deviceIDs?.append(device._id)
})
}
But the method "getDeviceData" is not getting called.
TableView implementation in HomeVC :
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = shortcutTable.dequeueReusableCell(withIdentifier: "shortcutCell", for: indexPath) as! shortcutCell
cell.delegate = self
cell.deviceArray = self.allDevices
return cell
}
UITableView cell Swift File :
class shortcutCell: UITableViewCell, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
var deviceArray : Array<device>?
CollectionView cell inside the UITableView cell file : Print statement returns nil.
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
print("DEVICE ARRAY COUNT", self.deviceArray?.count as Any)
return self.deviceArray?.count ?? 1
}
didSelectItemAt method for CollectionViewCell inside the UITableViewCell : This works fine that means deviceArray is not nil at this moment and deviceArray has received data from HomeVC
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
print(self.deviceArray)
print(indexPath.row)
print(self.deviceArray?[indexPath.row].givenName)
}
Related
I am using collectionview in tableview cell,
i need to pass selected collectionview cells value to next viewcontroller, how?
code: here is the code for tableview and collectionview cell
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "CategoryNewTableCell", for: indexPath) as! CategoryNewTableCell
let indexData = self.activeCategories?[indexPath.row]
cell.selectionStyle = .none
cell.catNameLbl.text = indexData?.details?.first?.title
cell.subCategories = indexData?.sub_categories
cell.clcSeller.reloadData()
}
class CategoryNewTableCell: UITableViewCell,UICollectionViewDelegate,UICollectionViewDataSource{
#IBOutlet weak var clcSeller: UICollectionView!
public var subCategories : Array<Sub_categories>?
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return subCategories?.count ?? 0
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "SubCatCollectionCell", for: indexPath) as! SubCatCollectionCell
let subCategory = self.subCategories?[indexPath.item]
cell.lblTitle.text = langType == .en ? subCategory?.details?.first?.title : subCategory?.details?[1].title
return cell
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let vc = StoryBoard.main.instantiateViewController(withIdentifier: "SearchResultVC") as! SearchResultVC
vc.subCatId = sub_categories?[indexPath.row].slug ?? ""
self.navigationController?.pushViewController(vc, animated: true)
}
}
here if i use didSelectItemAt for collectionview to send its selected cell value to next view controller
error:
Value of type 'CategoryNewTableCell' has no member 'navigationController'
if i give button action in main class then able to push but value is not going
class CategoryNewVC: UIViewController {
#IBAction func didselectcollectionviewBTn(_ sender: UIButton) {
let vc = StoryBoard.main.instantiateViewController(withIdentifier: "SearchResultVC") as! SearchResultVC
vc.subCatId = //here how to pass value
self.navigationController?.pushViewController(vc, animated: true)
}
}
here how to pass selected collectionview cells value to SearchResultVC please do help
EDIT
according to below answer i have added: still didSelectItemAt not called, why plz do help
class CategoryNewTableCell: UITableViewCell,UICollectionViewDelegate,UICollectionViewDataSource{
override func awakeFromNib() {
super.awakeFromNib()
self.clcSeller.delegate = self
self.clcSeller.dataSource = self
//
You can use protocol to send data to your nextviewcontroller.
protocol CategorySelectionDelegate {
func get(category: Sub_categories)
}
Declare the delegate in your CategoryNewTableCell and use it in didSelectItemAt method of your collectionviewcell like below:
class CategoryNewTableCell:
UITableViewCell,UICollectionViewDelegate,UICollectionViewDataSource{
#IBOutlet weak var clcSeller: UICollectionView!
public var subCategories : Array<Sub_categories>?
var delegate: CategorySelectionDelegate?
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return subCategories?.count ?? 0
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "SubCatCollectionCell", for: indexPath) as! SubCatCollectionCell
let subCategory = self.subCategories?[indexPath.item]
cell.lblTitle.text = langType == .en ? subCategory?.details?.first?.title : subCategory?.details?[1].title
return cell
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
delegate?.get(category: sub_categories?[indexPath.row])
}
}
Adopt the protocol in the receiving class
class CategoryNewVC: UIViewController, CategorySelectionDelegate {
func get(category: Sub_categories) {
let vc = StoryBoard.main.instantiateViewController(withIdentifier: "SearchResultVC") as! SearchResultVC
vc.subCatId = category.slug ?? ""
self.navigationController?.pushViewController(vc, animated: true)
}
}
Declare a callback in the tableViewCell subclass.
class CategoryNewTableCell: UITableViewCell {
var onSelectSubcategory: ((_ subcategoryID: String) -> Void)?
}
Assign this callback in your cellForRow like this.
cell.subCategories = indexData?.sub_categories
cell.onSelectSubcategory = { [weak self] (subcategoryID) in
let vc = StoryBoard.main.instantiateViewController(withIdentifier: "SearchResultVC") as! SearchResultVC
vc.subCatId = subcategoryID
self?.navigationController?.pushViewController(vc, animated: true)
}
Invoke this callback from collectionView didSelectItem like this.
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let subcategoryID = sub_categories?[indexPath.item].slug ?? ""
self.onSelectSubcategory?(subcategoryID)
}
I have a UICollectionView embedded in a UITableViewCell & I want to perform a segue when a UICollectionViewCell is pressed & pass the data represented by that cell to the destination ViewController for detailed information.
Here is the code for the embedded UICollectionView inside the UITableViewCell
#IBOutlet weak var EventCollection: UICollectionView!
var events = [Events]()
override func awakeFromNib() {
super.awakeFromNib()
EventCollection.delegate = self
EventCollection.dataSource = self
}
extension PopularCell: UICollectionViewDelegate, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return events.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = EventCollection.dequeueReusableCell(withReuseIdentifier: "EventCell", for: indexPath) as! EventCell
let event = events[indexPath.row]
print("Event Name:\(event.event_name)")
cell.event = event
cell.tag = indexPath.row
return cell
}
How do I perform & prepare a segue in the main ViewController when a UICollectionViewCell is pressed so as to pass the data contained by that cell to the destination ViewController
Here are the steps that you need to do.
As you said, your CollectionView is inside TableView. So your TableView delegates/DataSources binded with the MainViewController. CollectionView delegates/DataSources binded with the TableViewCell.
Now create a protocol to know user has clicked on collectionView.
protocol MyProtocol : class {
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath)
}
In TableViewCell, you need to call delegate like this,
class MyTableCell : UITableViewCell, UICollectionViewDelegate {
weak var delegate : MyProtocol?
:
:
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
if let delegate = delegate {
delegate.collectionView(collectionView, didSelectItemAt: indexPath)
}
}
}
Now your MainViewController must have to conform this protocol,
class MainViewController :UIViewController, MyProtocol {
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
// Do segue here ....
}
}
Note : Make sure to bind delegate with your MainViewController i.e. in TableviewCellForRow have cell.delegate = self
Add the following code with in a new file named UIView_Ext
extension UIView {
var parentViewController: UIViewController? {
var parentResponder: UIResponder? = self
while parentResponder != nil {
parentResponder = parentResponder!.next
if let viewController = parentResponder as? UIViewController {
return viewController
}
}
return nil
}
}
In func didSelectItem(At indexPath: IndexPath) method , write the following code
self.parentViewController?.performSegue(withIdentifier: "Identifer", sender: "Your Data in place of this string")
I am working on a meme generator app. The meme generator is presented modally and is built into a tab bar view controller. The first tab displays all saved memes in a table view and the second is intended to display the saved memes in a collection view. The meme generator works as design and is saving generated memes to an array that is located in the App Delegate file (I know this is controversial, but it is a requirement of the exercise). I am attempting to set up the collection view and I am not able to get a reference to the meme object in the app delegate file and I don't understand why.
import UIKit
class CollectionViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {
#IBOutlet weak var collectionView: UICollectionView!
var memes: [Meme]! {
didSet {
collectionView.reloadData()
}
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
let appDelegate = UIApplication.shared.delegate as! AppDelegate
memes = appDelegate.memes
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return memes.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath)
cell.imageView.image = memes[indexPath].memedImage
return cell
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
}
}
I based this code on the code used for my table view, which works as designed. That code is:
import UIKit
class TableViewMemesViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var tableView: UITableView!
var memes: [Meme]! {
didSet {
tableView.reloadData()
}
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
let appDelegate = UIApplication.shared.delegate as! AppDelegate
memes = appDelegate.memes
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return memes.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell")
let meme = memes[indexPath.row]
cell?.imageView?.image = meme.memedImage
cell?.textLabel?.text = meme.topText
return cell!
}
}
How can I get a reference to the array data and display it inside of the collection view when the user saves a new meme? Here is a link to the repo.
You have some issues, first you have to create a Custom CollectionViewCell:
class Cell: UICollectionViewCell {
#IBOutlet var imageView:UIImageView!
}
remember to set the Custom Class for UICollectionViewCell inside the storyboard:
then when you dequeue the cell, be sure of as! Cell:
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! Cell
cell.imageView.image = memes[indexPath.row].memedImage
return cell
}
Then inside your TabBarStoryboard.storyboard, you must set delegate and datasource for your CollectionViewController (I checked your github, you didn't attach them).
Finally the result will be:
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!
}
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
}
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.
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
}
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()
}
I'm really new in iOS/Swift and i'm in a small project. In this project i have a UITableView inside ViewController. And i have another file custom CollectionViewCell in side UITableViewCell.
I want when user click a cell in collectionview it will open another ViewController and it get data from this collectionviewcell.
This is my uitableview swift file:
class IndexRow: UITableViewCell, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
var names:[String] = ["Movie 1","Movie 2","Movie 3","Movie 4","Movie 5","Movie 6"]
#IBOutlet weak var collectionView: UICollectionView!
override func awakeFromNib() {
super.awakeFromNib()
collectionView.registerClass(indexOneMovie.self, forCellWithReuseIdentifier: "onemovie")
let nib = UINib(nibName: "indexOneMovie",bundle: nil)
collectionView.registerNib(nib, forCellWithReuseIdentifier: "onemovie")
self.collectionView.backgroundColor = UIColor.clearColor()
self.collectionView.delegate = self
self.collectionView.dataSource = self
print("Hello")
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return names.count
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = self.collectionView.dequeueReusableCellWithReuseIdentifier("onemovie", forIndexPath: indexPath) as! indexOneMovie
cell.poster.image = UIImage(named: "poster.jpg")
cell.name.text = names[indexPath.row]
return cell
}
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
print(indexPath.item)
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
let itemsPerRow:CGFloat = 2
let hardCodedPadding:CGFloat = 0
let itemWidth = (collectionView.bounds.width / itemsPerRow) - hardCodedPadding
let itemHeight = collectionView.bounds.height - (hardCodedPadding)
return CGSize(width: itemWidth, height: itemHeight)
}
How i can do it?
ok i have recently implemented the same in my app these are the links where i refered initially -
https://ashfurrow.com/blog/putting-a-uicollectionview-in-a-uitableviewcell-in-swift/
http://www.thorntech.com/2015/08/want-your-swift-app-to-scroll-in-two-directions-like-netflix-heres-how/
you are making uicollectionview delegate confirms to uitableview cell so you cannot present or push to other view controller.
here is my code hope it will help you
homeController.swift which contains uitableview
extension HomeController : UITableViewDelegate {
func tableView(tableView: UITableView,willDisplayCell cell: UITableViewCell,forRowAtIndexPath indexPath: NSIndexPath) {
guard let tableViewCell = cell as? TableViewCell else { return }
//here setting the uitableview cell contains collectionview delgate conform to viewcontroller
tableViewCell.setCollectionViewDataSourceDelegate(self, forRow: indexPath.row, andForSection: indexPath.section)
tableViewCell.collectionViewOffset = storedOffsets[indexPath.row] ?? 0
}
func tableView(tableView: UITableView,didEndDisplayingCell cell: UITableViewCell,forRowAtIndexPath indexPath: NSIndexPath) {
guard let tableViewCell = cell as? TableViewCell else { return }
storedOffsets[indexPath.row] = tableViewCell.collectionViewOffset
}
}
extension HomeController: UICollectionViewDelegate, UICollectionViewDataSource {
func collectionView(collectionView: UICollectionView,numberOfItemsInSection section: Int) -> Int {
let element : [CollectionViewElement] = self.returnCollectionViewElementAccordingToIndex(collectionView.tag)
return element.count
}
func collectionView(collectionView: UICollectionView,cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("Cell",forIndexPath: indexPath) as! horizontalCollectionViewCell
let element : [CollectionViewElement] = self.returnCollectionViewElementAccordingToIndex(collectionView.tag)
cell.cellTitleLabel.text = element[indexPath.row].videos.title
cell.cellGenerLabel.text = element[indexPath.row].videos.gener
return cell
}
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath){
print("collectionviewtag:\(collectionView.tag) + indexpathrow:\(indexPath.row)")
//from here you can do push or present to anyview controller
// collectionviewtag is tableView cell row value and indexpathrow return collectionView cell row value.
}
}
TableViewCell.swift :custom UITableViewCell which contains collectionView
class TableViewCell: UITableViewCell {
#IBOutlet private weak var collectionView: UICollectionView!
#IBOutlet weak var cellLabel: UILabel!
#IBOutlet weak var cellButton: UIButton!
#IBAction func CellButtonActionTry(sender: UIButton) {
print("Dude \(cellButton.tag)")
}
var collectionViewOffset: CGFloat {
get {
return collectionView.contentOffset.x
}
set {
collectionView.contentOffset.x = newValue
}
}
func setCollectionViewDataSourceDelegate<D: protocol<UICollectionViewDataSource, UICollectionViewDelegate>>
(dataSourceDelegate: D, forRow row: Int , andForSection section : Int) {
collectionView.delegate = dataSourceDelegate
collectionView.dataSource = dataSourceDelegate
collectionView.tag = row // tableView indexpathrow equals cell tag
collectionView.reloadData()
}
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
}
You can do it like this :
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
print(indexPath.item)
let name = names[indexPath.item]
let distinationViewController = DistinationViewController()
distinationViewController.name = name
if let navVC: UINavigationController = UIApplication.sharedApplication().keyWindow?.rootViewController as? UINavigationController {
navVC.pushViewController(distinationViewController, animated: true)
}
}
This is just a way to do it i dont know which view you want to push or what your names array contains so kindly change those things accordingly.
get root navigationcontroller from uiapplication and perform push on it.