Making UITableView with embedded UICollectionView using UITableViewAutomaticDimension
As you are doing very much stuff in cellForRow so it need time to ready and so when you scroll it is not showing properly
Check following things.
ViewController.swift
In View Did load
Add tableView.rowHeight = UITableViewAutomaticDimension
and replace this method
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let foo = foos[indexPath.row]
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! FooTableViewCell
cell.titleLabel.text = foo.title
cell.descriptionLabel.text = foo.description
self.view.layoutIfNeeded()
return cell
}
FooTableViewCell.swift
class FooTableViewCell: UITableViewCell {
@IBOutlet weak var titleLabel: UILabel!
@IBOutlet weak var stackView: UIStackView!
@IBOutlet weak var descriptionLabel: UILabel!
@IBOutlet weak var iconsCollectionView: IconsCollectionView!
@IBOutlet weak var const_Height_CollectionView: NSLayoutConstraint!
override func awakeFromNib() {
iconsCollectionView.translatesAutoresizingMaskIntoConstraints = false
iconsCollectionView.initFlowLayout(superviewWidth: self.frame.width)
iconsCollectionView.loadIconsSync()
iconsCollectionView.setNeedsLayout()
}
}
And I have removed StackView Form your storyboard and just give leading , trailing ,top and bottom constraints (Nothing complicated )
Here is output
Hope it is helpful to you
EDIT/UPDATE
YOu have many issues in your demo project.
I have made many changes in your demo project.
Copy and paste XML in storyboard.
DON'T FORGOT TO CONNECT HEIGHT CONSTRAINT
Here is complete storyboard XML
<?xml version="1.0" encoding="UTF-8"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13771" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
<device id="retina4_7" orientation="portrait">
<adaptation id="fullscreen"/>
</device>
<dependencies>
<deployment identifier="iOS"/>
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13772"/>
<capability name="Safe area layout guides" minToolsVersion="9.0"/>
<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
</dependencies>
<scenes>
<!--View Controller-->
<scene sceneID="tne-QT-ifu">
<objects>
<viewController id="BYZ-38-t0r" customClass="ViewController" customModule="CollectionViewInTableView" customModuleProvider="target" sceneMemberID="viewController">
<view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
<rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<subviews>
<tableView clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="196" estimatedRowHeight="-1" sectionHeaderHeight="28" sectionFooterHeight="28" translatesAutoresizingMaskIntoConstraints="NO" id="ZhZ-if-Yia">
<rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
<color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
<prototypes>
<tableViewCell clipsSubviews="YES" contentMode="scaleToFill" preservesSuperviewLayoutMargins="YES" selectionStyle="default" indentationWidth="10" reuseIdentifier="cell" rowHeight="196" id="1WO-2S-MI9" customClass="FooTableViewCell" customModule="CollectionViewInTableView" customModuleProvider="target">
<rect key="frame" x="0.0" y="28" width="375" height="196"/>
<autoresizingMask key="autoresizingMask"/>
<tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" preservesSuperviewLayoutMargins="YES" insetsLayoutMarginsFromSafeArea="NO" tableViewCell="1WO-2S-MI9" id="2lF-aM-Z2U">
<rect key="frame" x="0.0" y="0.0" width="375" height="195.5"/>
<autoresizingMask key="autoresizingMask"/>
<subviews>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Title" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="vs4-91-woo">
<rect key="frame" x="8" y="8" width="359" height="20.5"/>
<fontDescription key="fontDescription" type="system" pointSize="17"/>
<nil key="textColor"/>
<nil key="highlightedColor"/>
</label>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Description" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="lD2-bR-lnm">
<rect key="frame" x="8" y="36.5" width="359" height="20.5"/>
<fontDescription key="fontDescription" type="system" pointSize="17"/>
<nil key="textColor"/>
<nil key="highlightedColor"/>
</label>
<collectionView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" dataMode="prototypes" translatesAutoresizingMaskIntoConstraints="NO" id="6sQ-gf-Y6x" customClass="IconsCollectionView" customModule="CollectionViewInTableView" customModuleProvider="target">
<rect key="frame" x="8" y="65" width="359" height="92.5"/>
<color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
<constraints>
<constraint firstAttribute="height" relation="greaterThanOrEqual" priority="750" constant="88" id="f9g-Du-pYg"/>
</constraints>
<collectionViewFlowLayout key="collectionViewLayout" minimumLineSpacing="10" minimumInteritemSpacing="10" id="Nts-Lf-FPD">
<size key="itemSize" width="50" height="50"/>
<size key="headerReferenceSize" width="0.0" height="0.0"/>
<size key="footerReferenceSize" width="0.0" height="0.0"/>
<inset key="sectionInset" minX="0.0" minY="0.0" maxX="0.0" maxY="0.0"/>
</collectionViewFlowLayout>
<cells>
<collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" reuseIdentifier="item" id="8gX-Q1-0jG" customClass="BarCollectionViewCell" customModule="CollectionViewInTableView" customModuleProvider="target">
<rect key="frame" x="0.0" y="0.0" width="50" height="50"/>
<autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
<view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" insetsLayoutMarginsFromSafeArea="NO">
<rect key="frame" x="0.0" y="0.0" width="50" height="50"/>
<autoresizingMask key="autoresizingMask"/>
<subviews>
<imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleAspectFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="6cf-uD-BQl">
<rect key="frame" x="0.0" y="0.0" width="50" height="50"/>
</imageView>
</subviews>
</view>
<constraints>
<constraint firstAttribute="bottom" secondItem="6cf-uD-BQl" secondAttribute="bottom" id="0c3-ug-8tN"/>
<constraint firstItem="6cf-uD-BQl" firstAttribute="top" secondItem="8gX-Q1-0jG" secondAttribute="top" id="9xW-dN-c0m"/>
<constraint firstItem="6cf-uD-BQl" firstAttribute="leading" secondItem="8gX-Q1-0jG" secondAttribute="leading" id="dT6-RU-eE4"/>
<constraint firstAttribute="trailing" secondItem="6cf-uD-BQl" secondAttribute="trailing" id="nnz-oA-GgP"/>
</constraints>
<connections>
<outlet property="iconImageView" destination="6cf-uD-BQl" id="lFo-SS-Ego"/>
</connections>
</collectionViewCell>
</cells>
</collectionView>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="right" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="sXa-Mn-xxW">
<rect key="frame" x="8" y="165.5" width="359" height="30"/>
<state key="normal" title="Button"/>
</button>
</subviews>
<constraints>
<constraint firstItem="sXa-Mn-xxW" firstAttribute="leading" secondItem="2lF-aM-Z2U" secondAttribute="leading" constant="8" id="4ix-8u-0lO"/>
<constraint firstAttribute="bottom" secondItem="sXa-Mn-xxW" secondAttribute="bottom" id="50m-Bv-FF8"/>
<constraint firstAttribute="trailing" secondItem="sXa-Mn-xxW" secondAttribute="trailing" constant="8" id="8UW-vI-hge"/>
<constraint firstItem="6sQ-gf-Y6x" firstAttribute="leading" secondItem="2lF-aM-Z2U" secondAttribute="leading" constant="8" id="9ht-Ez-lJX"/>
<constraint firstAttribute="trailing" secondItem="vs4-91-woo" secondAttribute="trailing" constant="8" id="NOH-if-o7C"/>
<constraint firstItem="lD2-bR-lnm" firstAttribute="leading" secondItem="2lF-aM-Z2U" secondAttribute="leading" constant="8" id="S2D-Kj-5Og"/>
<constraint firstItem="vs4-91-woo" firstAttribute="leading" secondItem="2lF-aM-Z2U" secondAttribute="leading" constant="8" id="atk-7U-Mrw"/>
<constraint firstAttribute="trailing" secondItem="6sQ-gf-Y6x" secondAttribute="trailing" constant="8" id="bfY-uh-Su2"/>
<constraint firstItem="vs4-91-woo" firstAttribute="top" secondItem="2lF-aM-Z2U" secondAttribute="top" constant="8" id="gYO-XW-lmk"/>
<constraint firstAttribute="trailing" secondItem="lD2-bR-lnm" secondAttribute="trailing" constant="8" id="pkH-Pf-xE1"/>
<constraint firstItem="sXa-Mn-xxW" firstAttribute="top" secondItem="6sQ-gf-Y6x" secondAttribute="bottom" constant="8" id="w2O-4g-q6B"/>
<constraint firstItem="lD2-bR-lnm" firstAttribute="top" secondItem="vs4-91-woo" secondAttribute="bottom" constant="8" id="yG3-dE-CjF"/>
</constraints>
</tableViewCellContentView>
<connections>
<outlet property="const_Height_CollectionView" destination="f9g-Du-pYg" id="gw7-9T-hiU"/>
<outlet property="descriptionLabel" destination="lD2-bR-lnm" id="M4K-k5-6LN"/>
<outlet property="iconsCollectionView" destination="6sQ-gf-Y6x" id="FO2-dP-VNH"/>
<outlet property="titleLabel" destination="vs4-91-woo" id="HHy-1V-bTW"/>
</connections>
</tableViewCell>
</prototypes>
</tableView>
</subviews>
<color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
<constraints>
<constraint firstItem="ZhZ-if-Yia" firstAttribute="top" secondItem="8bC-Xf-vdC" secondAttribute="top" id="J8c-wQ-FxB"/>
<constraint firstItem="ZhZ-if-Yia" firstAttribute="bottom" secondItem="6Tk-OE-BBY" secondAttribute="bottom" id="KCX-nj-zXy"/>
<constraint firstItem="ZhZ-if-Yia" firstAttribute="leading" secondItem="6Tk-OE-BBY" secondAttribute="leading" id="QMU-w2-uUY"/>
<constraint firstItem="ZhZ-if-Yia" firstAttribute="trailing" secondItem="6Tk-OE-BBY" secondAttribute="trailing" id="yx7-yg-aqC"/>
</constraints>
<viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
</view>
<connections>
<outlet property="tableView" destination="ZhZ-if-Yia" id="WdR-nu-gjc"/>
</connections>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="117.59999999999999" y="118.29085457271366"/>
</scene>
</scenes>
</document>
FOOTableviewCell.swift
protocol TableViewDelegate {
func cellTapped (for:FooTableViewCell)
}
class FooTableViewCell: UITableViewCell {
static let singleCellHeight = 88;
@IBOutlet weak var titleLabel: UILabel!
@IBOutlet weak var descriptionLabel: UILabel!
@IBOutlet weak var iconsCollectionView: IconsCollectionView!
@IBOutlet weak var const_Height_CollectionView: NSLayoutConstraint!
var delegateCollection : TableViewDelegate?
var bars:[Bar] = [] {
didSet {
self.iconsCollectionView.reloadData()
iconsCollectionView.setNeedsLayout()
self.layoutIfNeeded()
const_Height_CollectionView.constant = iconsCollectionView.contentSize.height
self.layoutIfNeeded()
}
}
override func awakeFromNib() {
iconsCollectionView.translatesAutoresizingMaskIntoConstraints = false
iconsCollectionView.initFlowLayout(superviewWidth: self.frame.width)
iconsCollectionView.setNeedsLayout()
iconsCollectionView.dataSource = self
iconsCollectionView.delegate = self
const_Height_CollectionView.constant = iconsCollectionView.contentSize.height
self.layoutIfNeeded()
self.setNeedsLayout()
}
func cellTapped () {
iconsCollectionView.setNeedsLayout()
self.layoutIfNeeded()
self.setNeedsLayout()
const_Height_CollectionView.constant = iconsCollectionView.contentSize.height
self.delegateCollection?.cellTapped(for: self)
}
}
extension FooTableViewCell : UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return bars.count + 1
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "item", for: indexPath) as! BarCollectionViewCell
let row = indexPath.row
if(row >= bars.count) {
cell.iconImageView.image = UIImage(named: "add.png")
return cell
} else {
let bar = bars[row]
cell.iconImageView.image = UIImage(named: bar.imageName)
print(bar.imageName)
return cell
}
}
}
extension FooTableViewCell : UICollectionViewDelegate {
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
//deselectItem(at: indexPath, animated: true)
if(indexPath.row >= bars.count) { //it's a plus button
self.delegateCollection?.cellTapped(for: self)
}
}
}
IconCollectionView.swift
import UIKit
class IconsCollectionView: DynamicCollectionView {
var columnLayout:ColumnFlowLayout?
override func awakeFromNib() {
}
func initFlowLayout(superviewWidth:CGFloat) {
let layout = ColumnFlowLayout(
cellsPerRow: 4,
superviewWidth: superviewWidth,
minimumInteritemSpacing: 0,
minimumLineSpacing: 0,
sectionInset: UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
)
columnLayout = layout
collectionViewLayout = layout
}
}
ViewController.Swift
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var tableView: UITableView!
var foos:[Foo] = []
var bars:[[Bar]] = [[]]
override func viewDidLoad() {
super.viewDidLoad()
tableView.dataSource = self
tableView.delegate = self
tableView.estimatedRowHeight = 188
tableView.rowHeight = UITableViewAutomaticDimension
for i in stride(from: 1, to: 10, by: 1) {
let foo = Foo()
foo.title = "Item \(i)"
foo.description = "Description \(i)"
foos.append(foo)
}
bars.removeAll()
for _ in 0 ..< foos.count {
bars.append(self.loadIconsSync())
}
}
func loadIconsSync() -> [Bar] {
var barObjects :[Bar] = []
let iconsCount = Utils.rnd(3, 8)
for _ in stride(from: 1, to: iconsCount, by: 1) {
barObjects.append(self.getRandomItem())
}
return barObjects
}
func getRandomItem() -> Bar {
let randomIndex = Utils.rnd(1, 10)
let bar = Bar()
bar.imageName = "icon_\(randomIndex).png"
return bar
}
}
extension ViewController : UITableViewDataSource,UITableViewDelegate {
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let foo = foos[indexPath.row]
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! FooTableViewCell
var bar = bars[indexPath.row]
cell.bars = bar
cell.titleLabel.text = foo.title
cell.descriptionLabel.text = foo.description
cell.delegateCollection = self
self.view.layoutIfNeeded()
cell.const_Height_CollectionView.constant = cell.iconsCollectionView.contentSize.height
self.view.layoutIfNeeded()
return cell
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return foos.count
}
}
extension ViewController : TableViewDelegate {
func cellTapped(for obj: FooTableViewCell) {
if let indexPath = tableView.indexPath(for: obj) {
bars[indexPath.row].append(getRandomItem())
self.tableView.beginUpdates()
self.tableView.reloadRows(at: [indexPath], with: .automatic)
self.tableView.endUpdates()
}
}
}
OUTPUT
EDIT / UPDATE 2
I was not aware about orientation supports and ipad support.
now when the orientation changes we have to re-layout the collection view.
So logic is
total items + 1 (+ 1 because of that plus icon )
Item Size * (total Items / 3).rounded
suppose you have 7 Items
so item size is 93 (Per row) * ( 8 / 3).rounded = 279
So here you need to manage some hardcoded values as per your requirement for iPad and Landscape mode.
For now I am considering 3 objects per row same as iPhone design.
Here Hardcoded cell number is 3 You can manage your own.
Step1:
Add Following method in viewContorller.swift
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
super.viewWillTransition(to: size, with: coordinator)
self.tableView.beginUpdates()
self.tableView.reloadData()
self.tableView.endUpdates()
}
Replace cellForRowAtIndexPath
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let foo = foos[indexPath.row]
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! FooTableViewCell
cell.iconsCollectionView.initFlowLayout(superviewWidth: self.tableView.frame.width)
let bar = bars[indexPath.row]
cell.bars = bar
cell.titleLabel.text = foo.title
cell.descriptionLabel.text = foo.description
cell.delegateCollection = self
self.view.layoutIfNeeded()
let items:CGFloat = CGFloat(bar.count + 1)
let value = (items / 3.0).rounded(.awayFromZero)
cell.const_Height_CollectionView.constant = CGFloat((cell.iconsCollectionView.collectionViewLayout as! UICollectionViewFlowLayout).itemSize.height * value)
self.view.layoutIfNeeded()
cell.iconsCollectionView.setNeedsLayout()
return cell
}
And
func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
if let footCell = cell as? FooTableViewCell {
footCell.const_Height_CollectionView.constant = footCell.iconsCollectionView.contentSize.height
self.view.layoutIfNeeded()
}
}
In TableviewCell
var bars:[Bar] = [] {
didSet {
self.iconsCollectionView.reloadData()
iconsCollectionView.setNeedsLayout()
self.layoutIfNeeded()
let items:CGFloat = CGFloat(bars.count + 1)
let value = (items / 3.0).rounded(.awayFromZero)
const_Height_CollectionView.constant = CGFloat((iconsCollectionView.collectionViewLayout as! UICollectionViewFlowLayout).itemSize.height * value)
self.layoutIfNeeded()
}
}
and
func cellTapped () {
iconsCollectionView.setNeedsLayout()
self.layoutIfNeeded()
self.setNeedsLayout()
let items:CGFloat = CGFloat(bars.count + 1)
let value = (items / 3.0).rounded(.awayFromZero)
const_Height_CollectionView.constant = CGFloat((iconsCollectionView.collectionViewLayout as! UICollectionViewFlowLayout).itemSize.height * value)
self.delegateCollection?.cellTapped(for: self)
}
How to properly add an UICollectionView inside UITableViewCell using IOS 12
If you want the following output:
Code
ViewController:
class ViewController: UIViewController {
let list = [String](repeating: "Label", count: 10)
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(tableView)
tableView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
tableView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
tableView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor),
tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor)
])
tableView.reloadData()
}
public lazy var tableView: UITableView = { [unowned self] in
let v = UITableView.init(frame: .zero)
v.delegate = self
v.dataSource = self
v.estimatedRowHeight = 44
v.rowHeight = UITableViewAutomaticDimension
v.register(TableCell.self, forCellReuseIdentifier: "TableCell")
return v
}()
}
extension ViewController: UITableViewDelegate{
}
extension ViewController: UITableViewDataSource{
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return list.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "TableCell", for: indexPath) as! TableCell
cell.label.text = "\(list[indexPath.row]) \(indexPath.row)"
return cell
}
}
TableCell:
class TableCell: UITableViewCell{
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
commonInit()
}
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
commonInit()
}
func commonInit(){
contentView.addSubview(label)
contentView.addSubview(collectionView)
updateConstraints()
}
override func updateConstraints() {
label.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
label.topAnchor.constraint(equalTo: topAnchor),
label.leadingAnchor.constraint(equalTo: leadingAnchor),
label.trailingAnchor.constraint(equalTo: trailingAnchor)
])
collectionView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
collectionView.topAnchor.constraint(equalTo: label.bottomAnchor),
collectionView.leadingAnchor.constraint(equalTo: leadingAnchor),
collectionView.bottomAnchor.constraint(equalTo: bottomAnchor),
collectionView.trailingAnchor.constraint(equalTo: trailingAnchor),
])
super.updateConstraints()
}
let list = [String](repeating: "Task_", count: 10)
public let label: UILabel = {
let v = UILabel()
v.textAlignment = .center
return v
}()
public lazy var collectionView: UICollectionView = { [unowned self] in
let layout = UICollectionViewFlowLayout()
layout.minimumLineSpacing = 0
layout.minimumInteritemSpacing = 0
let v = UICollectionView(frame: .zero, collectionViewLayout: layout)
v.register(CollectionCell.self, forCellWithReuseIdentifier: "CollectionCell")
v.delegate = self
v.dataSource = self
v.isScrollEnabled = false
return v
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