How to make Collection View cell more than one column? - ios

Here the output of the code but I want to make it into 2 column
I want to make a collection view with more than 1 column but this code just shows one column. Can anyone help me how to fixed it??? Thank You....
import UIKit
class SearchViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {
#IBOutlet weak var collectionView: UICollectionView!
Here the array
var collectionArray : [String] = ["1", "2", "3", "4"]
let labelnamee = [("Long Sleeve Abstract Print Top"), ("Logo Graphic Print Top"), ("Material Study T-Shirt"), ("Mission Statement Print T-Shirt"), ("Printed Logo T-Shirt"), ("Tie-Dye Print T-Shirt")]
let labelpricee = [("RM 1021"), ("RM 860"), ("RM 750"), ("RM 750") , ("RM 670"), ("RM 760")]
let imagee = [UIImage(named: "abstractprint"),
UIImage(named: "longsleeve"),UIImage(named: "studymaterial"),UIImage(named: "mission"), UIImage(named: "white"), UIImage(named: "tiedye")]
override func viewDidLoad() {
super.viewDidLoad()
collectionView.delegate = self
collectionView.dataSource = self
}
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return labelnamee.count
}
for the collection cell border
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CollectionViewCell
let cellIndex = indexPath.item
cell.imageView.image = imagee[cellIndex]
cell.labelname.text = labelnamee[cellIndex]
cell.labelprice.text = labelpricee[cellIndex]
cell.contentView.layer.cornerRadius = 10
cell.contentView.layer.borderWidth = 1.0
cell.contentView.layer.borderColor = UIColor.blue.cgColor
cell.backgroundColor = UIColor.white
cell.layer.shadowColor = UIColor.gray.cgColor
cell.layer.shadowOffset = CGSize(width: 0.0, height: 2.0)
cell.layer.shadowRadius = 2.0
cell.layer.shadowOpacity = 1.0
cell.layer.masksToBounds = false
cell.layer.shadowPath = UIBezierPath(roundedRect: cell.bounds, cornerRadius: cell.contentView.layer.cornerRadius).cgPath
return cell
}
}
Here the code for the layout. I think I made mistake in the height or weight..
extension SearchViewController : UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let bounds = collectionView.bounds
let heigtVal = self.view.frame.height
let widthVal = self.view.frame.width
let cellsize = (heigtVal < widthVal) ? bounds.height/2: bounds.width/2
return CGSize(width: cellsize - 10, height: cellsize - 10)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 0
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 10
}
}

If the width of the cell or the contents of the cells is such that the collectionView cannot accommodate be able to see them within the visible portion of the screen, the collection view automatically places next to them. You have to scroll your collecctionView to see your next column.
If you want to see two columns within the visible screen portion, pls follow the steps:
Firstly place all your views inside a StackView and align them vertically.
Then set the right width & height constraints to your imageView to maintain the aspect ratio for your requirements. I have set like below just to demonstrate:
Along with the above constraints, I have also set the cell size to automatic in Storyboard itself rather than doing programmatically. Removed sizeForItemAt indexPath from code
:
Finally, after following all the above steps the output looked like this

Related

How to show three rounded images in Collectionview cell in all iPhone screen sizes in swift

I have taken collectionview in storyboard and in its cell i have taken ImageView and its below one label
i need to show only three rounded images horzontally and number of rows from JSON vertically in all screen sizes
like below image i need:
in cell for imageview costraints like below
leading = trailing = top = bottom = 5
and in coding:
class FriendsViewController: UIViewController {
// MARK: - IBOutlets
#IBOutlet weak var galleryCollectionView: UICollectionView!
// MARK: - LifeCycleMethods
override func viewDidLoad() {
super.viewDidLoad()
let layout = UICollectionViewFlowLayout()
layout.sectionInset = UIEdgeInsets(top: 0, left: 5, bottom: 0, right: 5)
layout.scrollDirection = .vertical
let width = UIScreen.main.bounds.width/4
let height = width*1.1
layout.minimumInteritemSpacing = 0
layout.minimumLineSpacing = 5
layout.itemSize = CGSize(width: width, height: height)
self.galleryCollectionView.collectionViewLayout = layout
}
}
class FriendsCollectionViewCell: UICollectionViewCell {
#IBOutlet weak var imgView: UIImageViewX!
#IBOutlet weak var lblTitle: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
imgView.layer.cornerRadius = imgView.frame.height/2.0 }
}
so i am getting weird o/p in different screen sizes why?
o/p of ipodtouch7
In your collectionview cell Set constraints as shown in attached image, i.e. ur image view width should depend on imageview height, you can do it using ratio.
Then in willDisplay method calculate cornerRadius
func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath)
{
guard let cell = cell as? TestCollectionViewCell else
{
return
}
let cellHeight : CGFloat = cell.frame.size.height
let labelHeight : CGFloat = cell.label?.frame.size.height ?? 0.0
cell.imageView?.layer.cornerRadius = (cellHeight - labelHeight) / 2.0
}
Below is the entire code
class ViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout
{
#IBOutlet weak var collectionView : UICollectionView? = nil
let horizontalSpaceBetweenCell : CGFloat = 16
let verticalSpaceBetweenCell : CGFloat = 16
let edgeInsets = UIEdgeInsets(top: 0, left: 16, bottom: 0, right: 16)
override func viewDidLoad()
{
super.viewDidLoad()
setup()
}
func setup()
{
let nib = UINib(nibName: "TestCollectionViewCell", bundle: nil)
collectionView?.register(nib, forCellWithReuseIdentifier: "TestCollectionViewCell")
}
func numberOfSections(in collectionView: UICollectionView) -> Int
{
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
{
return 40
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
{
if let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "TestCollectionViewCell", for: indexPath) as? TestCollectionViewCell
{
return cell
}
return UICollectionViewCell()
}
func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath)
{
guard let cell = cell as? TestCollectionViewCell else
{
return
}
let cellHeight : CGFloat = cell.frame.size.height
let labelHeight : CGFloat = cell.label?.frame.size.height ?? 0.0
cell.imageView?.layer.cornerRadius = (cellHeight - labelHeight) / 2.0
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize
{
let numberOfCellsPerRow = 3
let otherSpace = (edgeInsets.left + edgeInsets.right)
let width = (collectionView.frame.size.width - otherSpace) / CGFloat(numberOfCellsPerRow)
return CGSize(width: width, height: 80) // Height can be anything 80, 90 ,100
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 0
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 16
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return edgeInsets
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath)
{
}
}
Please change Widhth to height :
imgView.layer.cornerRadius = imgView.frame.size.height/2.0

Collection View cell in Swift is not formatting correctly

I am new to Swift and I am trying to create a UICollectionViewCell. It builds successfully but the cells are not the size that I thought I was creating. There are supposed to be two columns and and it is supposed to contain an image, description and price. I know it is something simple but I cannot figure out what I am doing wrong. See the image below. I assume I need to fix something in the size inspector but I cannot figure out what.
import UIKit
class ProductsVC: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout{
#IBOutlet weak var productsCollection: UICollectionView!
private(set) public var products = [Product]()
override func viewDidLoad() {
super.viewDidLoad()
productsCollection.dataSource = self
productsCollection.delegate = self
}
func initProducts(category: Category){
products = DataService.instance.getProducts(forCategoryTitle: category.title)
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return products.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ProductCell", for: indexPath) as? ProductCell {
let product = products[indexPath.row]
cell.updateViews(product: product)
return cell
}
return ProductCell()
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let height: CGFloat = 280
return CGSize(width: (collectionView.frame.size.width - 10) / 2, height: height)
//10 is minimum line spacing between two columns
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 10
}
}
FYI
Try this:
// MARK: - UICollectionViewDelegateFlowLayout
extension ViewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
// You can change collection view cell height here, It's up to your design
let height: CGFloat = 150
let width: CGFloat = (collectionView.frame.size.width - 10 - a) / 2 // a is extra spacing of collection view (like leading or trailing constraints)
// Converting CGFloat to Int make sure the width of total cells are less than or equal the screen width
return CGSize(width: Int(width), height: Int(height)) // 10 is minimum line spacing between two columns
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 10
}
}
Please check extra spacings example with the below photo:
a = 20 with my example design (leading = 10, trailing = 10)
just provide the itemSize when you declare the collectionView:
let layout = UICollectionViewFlowLayout()
layout.itemSize = sizeForEachItem
let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)

Swift: Create stack of imageView with collectionView

Hey i want to create stack of UIImageView like the photo, how to do this
It must be dynamic. How can I move the cells so that they are one below the other?
Use UICollectionViewDelegateFlowLayout methods to make this kind of UI.
Example:
class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
#IBOutlet weak var collectionView: UICollectionView!
override func viewDidLoad() {
super.viewDidLoad()
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 3
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)
cell.layer.borderWidth = 2.0
cell.layer.borderColor = UIColor.white.cgColor
cell.layer.cornerRadius = 50.0
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: collectionView.bounds.height, height: collectionView.bounds.height)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 0
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return -50
}
}
In the above code
Configure minimumLineSpacingForSectionAt and minimumInteritemSpacingForSectionAt methods of UICollectionViewDelegateFlowLayout.
Since the cell in collectionView are aligned left to right default, so to get the desired result we need to align them right to left.
As shown in above screenshot, use semantic property of collectionView for right to left alignment of cells.
Screenshot:
Edit-1:
One way to centre the cells in collectionView is to play with collectionView's width and centre it horizontally.
CollectionView constraints - top, width, centeredorizontally
In viewDidAppear, manually calculate the width of collectionView according to the numberOfItems. In your case numberOfItems = 3
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
let width = min((collectionView.bounds.height) * CGFloat((numberOfItems-1)/2 + 1), UIScreen.main.bounds.width)
self.collectionViewWidthConstraint.constant = width
}
You can use UICollectionView Custom Layout .
Collection view layouts are subclasses of the abstract UICollectionViewLayout class. They define the visual attributes of every item in your collection view. The individual attributes are instances of UICollectionViewLayoutAttributes and contain the properties of each item in your collection view, such as the item’s frame or transform.
The similar Tutorial
This is a more complex layout , Change some parameters , you will get what you want.
Copyed from github , mpospese/IntroducingCollectionViews
translate some to Swift
class SpiralLayout: UICollectionViewLayout{
let itemSize: CGFloat = 170
var pageSize: CGSize!
var contentSize: CGSize!
var radius: CGFloat!
var cellCounts: [Int]!
var pageRects: [CGRect]!
var pageCount: Int!
override func prepare() {
super.prepare()
pageSize = collectionView?.bounds.size
let iPad = UIDevice.current.userInterfaceIdiom == UIUserInterfaceIdiom.pad
let scaleFactor: CGFloat = iPad ? 1 : 0.5
let side = itemSize * scaleFactor
radius = min(pageSize.width - side, pageSize.height - side * 1.2 )/2 - 5
pageCount = collectionView?.numberOfSections
var counts = [Int]()
var rects = [CGRect]()
for section in 0..<pageCount{
counts.append((collectionView?.numberOfItems(inSection: section))!)
rects.append(CGRect(origin: CGPoint(x: CGFloat(section) * pageSize.width, y: 0), size: pageSize))
}
cellCounts = counts
pageRects = rects
contentSize = CGSize(width: pageSize.width * CGFloat(pageCount), height: pageSize.height)
}
override var collectionViewContentSize: CGSize{
return contentSize
}
override func shouldInvalidateLayout(forBoundsChange newBounds: CGRect) -> Bool {
return !pageSize.equalTo(newBounds.size)
}
func layoutAttributesForItem(at indexPath: IndexPath) -> UICollectionViewLayoutAttributes? {
var attributes = UICollectionViewLayoutAttributes(forCellWith: indexPath)
attributes.size = CGSize(width: itemSize, height: itemSize)
// ...
return attributes
}
}

How to align these collectionview cells properly?

I am creating a page where I use collection view. The layout will be like Apple's Music app where each row displays two square-shaped cells
I want a layout like this-this layout has super equal margins around but in my app the first collection cell is stuck to the left edge and the 2nd cell is stuck to the right edge
private let cellReuseIdentifier = "cellReuseIdentifier"
class FeedViewController: UICollectionViewController {
override func viewDidLoad() {
super.viewDidLoad()
collectionView?.backgroundColor = .white
setupNavBar()
setupCollectionView()
}
func setupCollectionView() {
collectionView?.register(FeedCollectionViewCell.self, forCellWithReuseIdentifier: cellReuseIdentifier)
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 6
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellReuseIdentifier, for: indexPath)
return cell
}
}
extension FeedViewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let padding: CGFloat = 25
let collectionViewSize = collectionView.frame.size.width - padding
return CGSize(width: collectionViewSize/2, height: collectionViewSize/2)
}
}
You can use the layout properties to set the collection view inset and the space you want between your cells, in your collection view setup function:
guard let layout = collectionView.collectionViewLayout as? UICollectionViewFlowLayout else { return }
layout.sectionInset = UIEdgeInsets(top: yourTopValue, left: yourLeftValue, bottom: yourBottomValue, right: yourRightValue)
layout.minimumInteritemSpacing = yourSpacing
layout.minimumLineSpacing = yourSpacing
Use following code to achieve your needs.
Padding value should be addition of all three spaces(Left, Center, Right)
Let's suppose padding value = 25 then it should consider 75 in layout calculation to get exact spacing.
And set left, top, center and right space with value 25(As you want to add space there).
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let cellWidth: CGFloat = (collectionView.frame.size.width / 2) - ((padding value * 3)/2)
let cellHeight: CGFloat = (collectionView.frame.size.height / 2) - ((padding value * 3)/2)
return CGSize.init(width: cellWidth, height: cellHeight)
}
Sure it will work

UICollectionView Items are offsetting by its section position

I have implemented UICollectionView for rendering WKWebview as contentView's subview of UICollectionViewCell and bound UIPageControl to it.
Note: Just for demoing the problem while rendering, I have made the size of the cell width as 100
Problem is first Webview(Which is a cell in the first section of collection view) is showing as expected but the second cell displaying with an offset of cell width.
UICollectionViewDelegate Override methods
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 1;
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
// set this width for just showing screenshot for this question
return CGSize(100, height: view.frame.height-view.safeAreaInsets.top);
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 0;
}
func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
self.webviewsPageControl.currentPage = indexPath.section;
}
func numberOfSections(in collectionView: UICollectionView) -> Int {
self.webviewsPageControl.numberOfPages = self.webviews?.count ?? 0;
return self.webviews?.count ?? 0;
}
For identification, I made the UICollectionViewCell background as red.
So the question is, how to remove the offset so that webviews can be rendered side by side. And Why is this behavior.
Thanks in advance.
You need to set the minimumLineSpacing = 0 on the flow layout, e.g.
let layout = UICollectionViewFlowLayout();
layout.minimumLineSpacing = 0
let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
I use the following code to reduce spacing between columns:
let cellsPerRow = 2 //number of columns or number of cells in each row
In viewDidLoad():
guard let flowLayout = collectionView?.collectionViewLayout as? UICollectionViewFlowLayout else { return }
flowLayout.minimumInteritemSpacing = 0 //setting margin between cell columns = 0
flowLayout.minimumLineSpacing = 0// setting margin between cell lines = 0
flowLayout.sectionInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0) //Not required, solutions works without it as well
Finally,
//function to set number of columns
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let flowLayout = collectionView.collectionViewLayout as! UICollectionViewFlowLayout
let marginsAndInsets = flowLayout.sectionInset.left + flowLayout.sectionInset.right + flowLayout.minimumInteritemSpacing * CGFloat(cellsPerRow - 1)
let itemWidth = ((collectionView.bounds.size.width - marginsAndInsets) / CGFloat(cellsPerRow)).rounded(.down)
return CGSize(width: itemWidth, height: itemWidth)
}

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