I tried to make two square collectionView cells in one row. I implemented all of the necessary delegates. When the view is loaded, cells are not square but when I start scrolling, some cells are being square.
when I start scrolling :
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
collectionView.delegate = self
collectionView.dataSource = self
}
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize{
let width = (collectionView.frame.width/2)-0.5
return CGSize(width:width , height: width)
}
Add more margin to width in layout delegate
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize{
let width = (collectionView.frame.width/2)-10
return CGSize(width:width , height: width)
}
Related
Collection view cells are not showing correctly from left to right. It has the gap in center. How can I correct this issue.
collectionView_.register(UINib.init(nibName: String(describing: GoalSelectionCollectionViewCell.self), bundle: nil), forCellWithReuseIdentifier: reuseIdentifier)
collectionView_.allowsMultipleSelection = true
if let flowLayout = collectionView_?.collectionViewLayout as? UICollectionViewFlowLayout {
flowLayout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let itemSize:CGSize = CGSize(width: 80.0, height: 30.0);
return itemSize;
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 20.0;
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 20.0;
}
You need to conform to UICollectionViewDelegateFlowLayout and you also need to set minimumLineSpacing (min spacing between lines) and minimumInteritemSpacing (min spacing in between items in same row)
I'm struggle a lot. I want to make a menu page with collectionView like this.
I set my width collectionView like this
addSubview(menuCollectionView)
menuCollectionView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
menuCollectionView.leadingAnchor.constraint(equalTo: leadingAnchor),
menuCollectionView.bottomAnchor.constraint(equalTo: bottomAnchor),
menuCollectionView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -129),
menuCollectionView.heightAnchor.constraint(equalToConstant: 33)
])
menuCollectionView.register(MenuCell.self, forCellWithReuseIdentifier: cellID)
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 2
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellID, for: indexPath)
cell.backgroundColor = .red
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 0
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 0
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: frame.width / 2, height: frame.height)
}
but it end up like this
the cell not fit with the width I setup, and it scroll to down. I was trying to replicate this tutorial from youtube pageMenuVideo but it behave differently. please help me :(
I'm using a
CollectionView
as a menu bar at the bottom of my
ViewController
I've created a custom class and have made 5 evenly spaced cells which fills the entire CollectionView on an iPhone 8 with the following, which is the desired result -
layout.itemSize = CGSize(width: self.frame.width / 5, height: self.frame.height)
layout.minimumInteritemSpacing = 0
layout.minimumLineSpacing = 0
self.contentInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
self.scrollIndicatorInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
self.collectionViewLayout = layout;
However when I run the project on any iPhone with a larger screen I get the following result:
My question is, how could I scale the cells up to fit without any margins, even if it requires the CollectionView to increase it's height, I would like the images (which will be placed in the cells) to maintain their aspect ratio from the iPhone 8 screen.
Could I just increase the size of each CollectionViewCell with code?
If so is there a way to do so without working out the width/height of each iPhone released to date?
Or can someone please recommend a different way to accomplish this? if I'm approaching this the wrong way.
Thanks in advance!
It seems that the view's width isn't correct in the place you put the line
layout.itemSize = CGSize(width: self.frame.width / 5, height: self.frame.height)
so replace it with
layout.itemSize = CGSize(width: UIScreen.main.bounds.width / 5, height: self.frame.height)
you can also implement
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
sizeForItemAt indexPath: IndexPath) -> CGSize
with conform to UICollectionViewDelegateFlowLayout
Here is my code for CollectionView. You can modify as per your requirement.
class HomeViewController: UIViewController,UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
#IBOutlet weak var homeCollectionView: UICollectionView!
override func viewDidLoad() {
super.viewDidLoad()
homeCollectionView.delegate = self;
homeCollectionView.dataSource = self;
homeCollectionView.reloadData()
}
//MARK:- COLLECTION VIEW
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 3
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int{
if let count = myArray.count{
return count
}
return 0
}
func collectionView(_ collectionView: UICollectionView,
viewForSupplementaryElementOfKind kind: String,
at indexPath: IndexPath) -> UICollectionReusableView {
switch kind {
case UICollectionElementKindSectionHeader:
let headerView = homeCollectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "HomeHeaderCell", for: indexPath) as! HomeHeaderCell
headerView.UpdateHeaderCell(indexPath: indexPath)
headerView.btn_SeeAll.addTarget(self, action: #selector(SeeAllDestinations), for: .touchUpInside)
return headerView
case UICollectionElementKindSectionFooter:
let footerView = homeCollectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "HomeFooterCell", for: indexPath) as! HomeFooterCell
return footerView
default:
return UICollectionReusableView()
}
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
return CGSize(width: collectionView.frame.width, height: 80)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForFooterInSection section: Int) -> CGSize {
return CGSize(width: collectionView.frame.width, height: 10)
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell{
let myCell:HomeTopDestinationsCell = collectionView.dequeueReusableCell(withReuseIdentifier: "HomeTopDestinationsCell", for: indexPath) as! HomeTopDestinationsCell
myCell.backgroundColor = UIColor.colorFromCode(0xf1f1f1)
myCell.UpdateCellValue(obj:(myArray[indexPath.row])!)
return myCell as HomeTopDestinationsCell;
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
}
//Use for size
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout,
sizeForItemAt indexPath: IndexPath) -> CGSize {
if DeviceType.IS_IPAD{
return CGSize(width: (self.view.frame.width-60)/3 , height: (self.view.frame.width-60)/3);
}
return CGSize(width: (self.view.frame.width-60)/2 , height: (self.view.frame.width-60)/2);
}
//Use for interspacing
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 10.0
}
func collectionView(_ collectionView: UICollectionView, layout
collectionViewLayout: UICollectionViewLayout,
minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 10.0
}
}
I'm having trouble setting my UICollectionViewCells to be all the same width and height so that there are no lines/spacing between each cell. Testing on an smaller iPhone like 5S and SE shows no lines between the cells, but larger iPhones such as 6,7 Pluses do - image description below. My view controller adopts UICollectionViewDelegateFlowLayout, and it has a collectionView.
In viewDidLoad, I set the collectionView's delegate to be the view controller.
override func viewDidLoad() {
super.viewDidLoad()
self.viewController.delegate = self
}
I use the following methods to set the cell size and spacing.
let screenWidth:CGFLoat = UIScreen.main.bounds.width
let cellsPerRow:CGFLoat = 4
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let side:Double = Double(self.screenWidth/self.cellsPerRow)
return CGSize(width: side, height: side)
}
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, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 0.0
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 0.0
}
iPhone 5S, No Lines
iPhone 7 Plus, Lines
Any recommendations or advice to get rid of these line/spacing is greatly appreciated!
I am working on Collection view.I want to display 3 rows in collection view . Each row having two cells.The problems is i can't able to fit the cells in a row.Please kindly refer my code which i tried.
import UIKit
class ProductsTableViewCell: UITableViewCell {
#IBOutlet weak var productsCollections: UICollectionView!
override func awakeFromNib() {
super.awakeFromNib()
productsCollections.isScrollEnabled = false
productsCollections.dataSource = self as? UICollectionViewDataSource
productsCollections.delegate = self as? UICollectionViewDelegate
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
}
extension ProductsTableViewCell: UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 6
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Product", for: indexPath)
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: 10, left: 10, bottom: 0, right: 10)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return collectionView.frame.width/9
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return collectionView.frame.width
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let collectionViewWidth = collectionView.bounds.width
let collectionViewHeight = collectionView.bounds.height
return CGSize(width: collectionViewWidth/2.0 , height: collectionViewHeight/2.5)
}
[This is the output i got.][1]}
I want like this.totally 6 rows.Per row 2 cells i want to display
First of all, calculate a row height that you need. So it is depends on screen resolution.
for example :
1- Declare a variable
fileprivate var cellHeight: CGFloat
2- calculate it once in viewDidLoad()
self.cellHeight = yourContainerFrameHeight / 3
3- Remove minimumLineSpacingForSectionAt
4- Calculate cell size.
I'm not sure, but you should not use the size of the CollectionView here (in sizeForItemAt). Instead you can use a fixed UIView or screen sizes. Because we already identify it.
This example has self.contentView you must change with yours or screen size
And try this:
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
flowLayout.invalidateLayout()
let vMiddle = self.contentView.frame.size.width / 2.0
//this calculation for prevent next row shifts and fit rows
let cellWidth =
indexPath.row % 2 == 0 ? floor(vMiddle) : self.contentView.frame.size.width - floor(vMiddle)
//print("---------- cell width : \(cellWidth)")
return CGSize(width: cellWidth, height: self.cellHeight)
}