I have a collectionview cell, and need to filtering cell.
I'm trying to make cell height to 0. but not work.
this is my code.
extension ViewController: UICollectionViewDataSource, UICollectionViewDelegate{
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return self.numberOfCell
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as? data else {
return UICollectionViewCell()
}
let set1 = CoreDataManager.shared.getSetting(idx: indexPath.row).set1
if(set1){
return cell
}
else{
let none = collectionView.dequeueReusableCell(withReuseIdentifier: "none", for: indexPath)
none.frame.size.width = 100
none.frame.size.height = CGSize(width: 0, height: 100).width
return none
}
}
}
If you need to set a size of cell you need to conform to UICollectionViewDelegateFlowLayout and implement sizeForItemAt and give it the size.
extension viewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 100, height: 0)}
}
another solution to make height constrain for a view inside the your cell with identifier "cell" and give it to 0 before returning a cell in cellForItemAt.
Related
I'm making a CollectionView which has 2 sections, everything is fine but the size. I'd like to give different size of cell in different section, but when I call sizeForItemAt, Xcode shows a yellow warning "Will never be executed". Here's how I set my CollectionView functions:
extension ArtistProfileViewController: UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 2
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
switch mySections[section] {
case .profile:
return 1
case .relatedArtists:
return 10
}
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
switch mySections[indexPath.section] {
case .profile:
guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: ArtistProfileCell.identifier, for: indexPath) as? ArtistProfileCell else { return UICollectionViewCell()}
return cell
case .relatedArtists:
guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: RelatedArtistCell.identifier, for: indexPath) as? RelatedArtistCell else { return UICollectionViewCell()}
cell.myImageView.image = UIImage(systemName: "person")
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 100, height: 100)
}
}
And here is how I set my CollectionView:
var myCollectionView: UICollectionView = {
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .vertical
layout.estimatedItemSize = .zero
let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
cv.register(ArtistProfileCell.self, forCellWithReuseIdentifier: ArtistProfileCell.identifier)
cv.register(RelatedArtistCell.self, forCellWithReuseIdentifier: RelatedArtistCell.identifier)
return cv
}()
I did set the CollectionView.delegate/datasource to self in viewDidLoad, and I can see the cell appear on the screen. However, the size of cell does not change at all. Plus, I know one of the solution is to set the estimated size to none in storyboard, but I don't know how to set it programmatically. So I don't know if it works.
There's one thing odd, when I call sizeForItemAt, it does not show the complete function automatically. I have to type it by myself like this.
Does anyone can help? Thanks in advance!
You put sizeForItemAt inside cellForItemAt. They need to be separate.
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
switch mySections[indexPath.section] {
case .profile:
guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: ArtistProfileCell.identifier, for: indexPath) as? ArtistProfileCell else { return UICollectionViewCell()}
return cell
case .relatedArtists:
guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: RelatedArtistCell.identifier, for: indexPath) as? RelatedArtistCell else { return UICollectionViewCell()}
cell.myImageView.image = UIImage(systemName: "person")
return cell
}
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 100, height: 100)
}
Try selecting your code, then pressing Ctrl + i to re-format your code (fixes indenting too!)
Currently, I have a UITableView with a UICollectionView embedded in it. I have 3 arrays of information and I want each array to correspond to a UICollectionView, and therefore a UITableViewCell.
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 5
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CookieCell", for: indexPath) as? MenuCollectionViewCell
cell?.fullView.layer.borderColor = UIColor.black.cgColor
cell?.labelView.layer.borderColor = UIColor.black.cgColor
cell?.fullView.layer.borderWidth = 0.3
cell?.labelView.layer.borderWidth = 0.3
return cell!
}
func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
}
Where each of the return cell? is, I want to do something like:
if indexPathOfTableView.row == 0 {
//designated parameters
}
else if indexPathOfTableView.row == 1 {
//designated parameters
}
else {
//designated parameters
}
How would I do this?
Hello #helloworld12345
from your question I got the idea that you want to collectionview in tableviewcell
may be below code will help you.
first in you viewController or tableviewcontroller,
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
//send indexPath of this cell
let cell = tblView.dequeueReusableCell(withIdentifier: "tableViewCell", for: indexPath) as! tableViewCell
//Pass your array which you want to show in collectionViewCell and then reload collection view
cell.clnView.reloadData()
return cell
}
In your tableViewCell swift file:
class tableViewCell: UITableViewCell, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout
{
#IBOutlet weak var clnView: UICollectionView!
//after awakenib method write below code
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
{
return 4 //pass your array count
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize
{
let flowayout = collectionViewLayout as? UICollectionViewFlowLayout
let space: CGFloat = (flowayout?.minimumInteritemSpacing ?? 0.0) + (flowayout?.sectionInset.left ?? 0.0) + (flowayout?.sectionInset.right ?? 0.0)
let size:CGFloat = (self.clnView.frame.size.width - space) / 2.0 //By this you can show two cell in one screen
return CGSize(width: size + 60, height: (size + 200))
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
{
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "clnViewCell", for: indexPath) as! clnViewCell
// do your stuff with your
return cell
}
}
I have UICollectionView that scrolls up vertically, and i want to change item height in tap. In default state, cell have a height of 2/3 screen height. I tried following:
override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let cell = collectionView.cellForItem(at: indexPath)
if let cell = cell as? TutorialCell {
let attribute = layout.layoutAttributesForItem(at: indexPath)
attribute?.frame = CGRect.init(x: 0, y: 0, width: UIScreen.main.bounds.size.width,
height: UIScreen.main.bounds.size.height)
collectionView.reloadItems(at: [indexPath])
}
print(indexPath.row)
}
But it's not working.
You can Achieve this by UICollectionViewDelegateFlowLayout method sizeForItemAt
Declare a variable
var selectIndex: Int = -1
In your didSelectItemAt add this
override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
self.selectIndex = indexPath.row
collectionView.reloadData()
}
Add an extension for UICollectionViewDelegateFlowLayout
extension YourViewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let height = (self.selectIndex == indexPath.row ) ?
UIScreen.main.bounds.size.height :
(UIScreen.main.bounds.size.height * 2) / 3
return CGSize(width:UIScreen.main.bounds.size.width, height:height)
}
}
I have a collection view which is nested inside of a table view cell. The first cell in the collection view is a button which allows users to create a new list. Its width is smaller than that of the main lists cells. I recently changed the code around so that the collectionView delegate and dataSource methods are in the tableViewController instead of the table view cell, however now the first cells width is not changing as it did before moving the code. This picture shows:
If I press into the blank space it is registering that I clicked the plus cell.
The code for all the collectionView delegate and dataSource methods:
extension ProfileTableViewController: UICollectionViewDelegate, UICollectionViewDataSource {
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
print("the media: \(usersLists.count)")
return usersLists.count + 1
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if indexPath.item == 0 {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "addNewListCell", for: indexPath) as! addNewListCell
cell.currentUser = currentUser
return cell
}else{
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "listCell", for: indexPath) as! userListsCell
cell.layer.applySketchShadow()
cell.layer.cornerRadius = 20
cell.layer.masksToBounds = false
cell.currentUser = currentUser
cell.media = usersLists[indexPath.item-1]
return cell
}
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize{
if indexPath.item == 0 {
let size = CGSize(width: 80, height: 158)
return size
}else{
let size = CGSize(width: 158, height: 158)
return size
}
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
if indexPath.item == 0 {
//button
self.addListDelegate?.addNewItem()
}
}
I tested if changing any values in the size in sizeForItemAt would change the cell size and nothing changes in any cells
the table view methods which are in the ProfileTableViewController class and not the extension:
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "profileCell", for: indexPath) as! profileCell
cell.selectionStyle = .none
return cell
}
override func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
guard let tableViewCell = cell as? profileCell else { return }
tableViewCell.setCollectionViewDataSourceDelegate(dataSourceDelegate: self, forRow: indexPath.row) //this line sets the collectionView delegate and datasouce so that I can have all of the collectionView methods in this class
}
and this is the code inside of the tableViewCell
protocol addListCollectionDelegate: class {
func addNewItem()
}
class profileCell: UITableViewCell, UICollectionViewDelegate {
#IBOutlet weak var collectionView: UICollectionView!
override func awakeFromNib() {
super.awakeFromNib()
collectionView.register(UINib(nibName: "usersLists", bundle: nil), forCellWithReuseIdentifier: "listCell")
collectionView.register(UINib(nibName: "newListCell", bundle: nil), forCellWithReuseIdentifier: "addNewListCell")
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
func setCollectionViewDataSourceDelegate
<D: UICollectionViewDataSource & UICollectionViewDelegate>
(dataSourceDelegate: D, forRow row: Int) {
collectionView.delegate = dataSourceDelegate
collectionView.dataSource = dataSourceDelegate
collectionView.reloadData()
}
}
Does anyone know how to change the width of the first cell since sizeForItemAt is not changing the size? Thanks
You forgot to add this protocol: UICollectionViewDelegateFlowLayout
It is required when you want to return custom size for an item.
Also improve your code like below:
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if indexPath.item == 0 {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "addNewListCell", for: indexPath) as! addNewListCell
cell.currentUser = currentUser
return cell
}
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "listCell", for: indexPath) as! userListsCell
cell.layer.applySketchShadow() // Write this line in cell class
cell.layer.cornerRadius = 20 // Write this line in cell class
cell.layer.masksToBounds = false // Write this line in cell class
cell.currentUser = currentUser
cell.media = usersLists[indexPath.item - 1]
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize{
return indexPath.item == 0 ? CGSize(width: 80, height: 158) : CGSize(width: 158, height: 158)
}
Try to use UICollectionViewDelegateFlowLayout method. In Xcode 11 or later, you need to set Estimate Size to none from Xib.
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout:
UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let padding: CGFloat = 170
let collectionViewSize = advertCollectionView.frame.size.width - padding
return CGSize(width: collectionViewSize/2, height: collectionViewSize/2)
}
I am trying to create collectionView inside another collectionViewCell. I can get the cell of outer collectionView however, compiler is not executing inner cell. How can I get both the cells?
P.S I am new at this.
CollectionViewController Class:
class CollectionViewController: UICollectionViewController, UICollectionViewDelegateFlowLayout{
#IBOutlet var collectionView1: UICollectionView!
var coll2 = CollectionViewCell()
override func viewDidLoad() {
super.viewDidLoad()
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 3
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: view.frame.width, height: 150)
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)as! CollectionViewCell
cell.backgroundColor = UIColor.black
return cell
}
}
CollectionViewCell CLass:
class CollectionViewCell: UICollectionViewCell {
#IBOutlet var collectionView2: UICollectionView!
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: collectionView2.frame.width, height: 150)
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell1 = collectionView.dequeueReusableCell(withReuseIdentifier: "cell2", for: indexPath)as! CollectionViewCell2
cell1.backgroundColor = UIColor.red
return cell1
}
enter image description here
}
set the delegates and data source of inner collection view to the first collection view cell.
override func awakeFromNib()
{
super.awakeFromNib()
// Initialization code
self.collectionView2?.delegate = self
self.collectionView2?.dataSource = self
}
The reason why CollectionViewCell is not setting up the collectionView2 is because you didn't set delegate and dataSource properties of collectionView2 to the instance of CollectionViewCell.
I have created a method called setupViews in CollectionViewCell so that it can be called when you are dequeuing a CollectionViewCell in CollectionViewController so that the delegate and dataSource are being setup properly.
class CollectionViewController: UICollectionViewController, UICollectionViewDelegateFlowLayout {
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 3
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: view.frame.width, height: 150)
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)as! CollectionViewCell
cell.backgroundColor = UIColor.black
cell.setupViews() // added this call
return cell
}
}
class CollectionViewCell: UICollectionViewCell, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
#IBOutlet weak var collectionView2: UICollectionView!
// added this method
func setupViews() {
collectionView2.delegate = self
collectionView2.dataSource = self
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: collectionView2.frame.width, height: 150)
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell1 = collectionView.dequeueReusableCell(withReuseIdentifier: "cell2", for: indexPath)
cell1.backgroundColor = UIColor.red
return cell1
}
}