Make basic collection view controller work

.gitignore

@@ -0,0 +1,143 @@
+
+# Created by https://www.toptal.com/developers/gitignore/api/swift,xcode,cocoapods,macos
+# Edit at https://www.toptal.com/developers/gitignore?templates=swift,xcode,cocoapods,macos
+
+### CocoaPods ###
+## CocoaPods GitIgnore Template
+
+# CocoaPods - Only use to conserve bandwidth / Save time on Pushing
+#           - Also handy if you have a large number of dependant pods
+#           - AS PER https://guides.cocoapods.org/using/using-cocoapods.html NEVER IGNORE THE LOCK FILE
+Pods/
+
+### macOS ###
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### Swift ###
+# Xcode
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+## User settings
+xcuserdata/
+
+## compatibility with Xcode 8 and earlier (ignoring not required starting Xcode 9)
+*.xcscmblueprint
+*.xccheckout
+
+## compatibility with Xcode 3 and earlier (ignoring not required starting Xcode 4)
+build/
+DerivedData/
+*.moved-aside
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+
+## Obj-C/Swift specific
+*.hmap
+
+## App packaging
+*.ipa
+*.dSYM.zip
+*.dSYM
+
+## Playgrounds
+timeline.xctimeline
+playground.xcworkspace
+
+# Swift Package Manager
+# Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
+# Packages/
+# Package.pins
+# Package.resolved
+# *.xcodeproj
+# Xcode automatically generates this directory with a .xcworkspacedata file and xcuserdata
+# hence it is not needed unless you have added a package configuration file to your project
+# .swiftpm
+
+.build/
+
+# CocoaPods
+# We recommend against adding the Pods directory to your .gitignore. However
+# you should judge for yourself, the pros and cons are mentioned at:
+# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
+# Pods/
+# Add this line if you want to avoid checking in source code from the Xcode workspace
+# *.xcworkspace
+
+# Carthage
+# Add this line if you want to avoid checking in source code from Carthage dependencies.
+# Carthage/Checkouts
+
+Carthage/Build/
+
+# Accio dependency management
+Dependencies/
+.accio/
+
+# fastlane
+# It is recommended to not store the screenshots in the git repo.
+# Instead, use fastlane to re-generate the screenshots whenever they are needed.
+# For more information about the recommended setup visit:
+# https://docs.fastlane.tools/best-practices/source-control/#source-control
+
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots/**/*.png
+fastlane/test_output
+
+# Code Injection
+# After new code Injection tools there's a generated folder /iOSInjectionProject
+# https://github.com/johnno1962/injectionforxcode
+
+iOSInjectionProject/
+
+### Xcode ###
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+
+
+
+## Gcc Patch
+/*.gcno
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+### Xcode Patch ###
+*.xcodeproj/*
+!*.xcodeproj/project.pbxproj
+!*.xcodeproj/xcshareddata/
+!*.xcworkspace/contents.xcworkspacedata
+**/xcshareddata/WorkspaceSettings.xcsettings
+
+# End of https://www.toptal.com/developers/gitignore/api/swift,xcode,cocoapods,macos

Cellorama.xcodeproj/xcuserdata/saheljalal.xcuserdatad/xcschemes/xcschememanagement.plist

@@ -7,7 +7,7 @@
 		<key>Cellorama.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>0</integer>
+			<integer>4</integer>
 		</dict>
 	</dict>
 </dict>

Cellorama.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

Cellorama/Base.lproj/Main.storyboard

@@ -1,24 +1,49 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="17506" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="pFp-tm-xRF">
+    <device id="retina6_1" orientation="portrait" appearance="light"/>
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="17505"/>
         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="System colors in document resources" minToolsVersion="11.0"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
-        <!--View Controller-->
+        <!--Main View Controller-->
         <scene sceneID="tne-QT-ifu">
             <objects>
-                <viewController id="BYZ-38-t0r" customClass="ViewController" customModuleProvider="target" sceneMemberID="viewController">
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+                <viewController id="BYZ-38-t0r" customClass="MainViewController" customModule="Cellorama" 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"/>
+                        <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
-                        <color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
                         <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                        <color key="backgroundColor" systemColor="systemBackgroundColor"/>
                     </view>
+                    <navigationItem key="navigationItem" id="kxB-1x-wdV"/>
                 </viewController>
-                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
             </objects>
+            <point key="canvasLocation" x="1130" y="451"/>
+        </scene>
+        <!--Navigation Controller-->
+        <scene sceneID="Yge-EZ-4R0">
+            <objects>
+                <navigationController id="pFp-tm-xRF" sceneMemberID="viewController">
+                    <navigationBar key="navigationBar" contentMode="scaleToFill" id="Kk0-jt-Iwz">
+                        <rect key="frame" x="0.0" y="44" width="414" height="44"/>
+                        <autoresizingMask key="autoresizingMask"/>
+                    </navigationBar>
+                    <connections>
+                        <segue destination="BYZ-38-t0r" kind="relationship" relationship="rootViewController" id="52A-hs-Tc9"/>
+                    </connections>
+                </navigationController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="kJG-K4-Abm" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="239" y="451"/>
         </scene>
     </scenes>
+    <resources>
+        <systemColor name="systemBackgroundColor">
+            <color white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+        </systemColor>
+    </resources>
 </document>

Cellorama/Cells/CollectionCell.swift

@@ -0,0 +1,89 @@
+//
+//  CollectionCell.swift
+//  Cellorama
+//
+//  Created by Sahel Jalal on 12/16/20.
+//
+
+import UIKit
+
+class CollectionCell: UICollectionViewCell, Reusable {
+
+    weak var containerViewController: UIViewController?
+    var childViewController: UIViewController?
+
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+
+        layer.cornerRadius = 10
+        layer.masksToBounds = false
+        layer.shadowColor = UIColor.black.cgColor
+        layer.shadowOpacity = 0.2
+        layer.shadowOffset = .zero
+        layer.shadowRadius = 5
+        contentView.layer.cornerRadius = 10
+        contentView.layer.masksToBounds = true
+    }
+
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    override func layoutSubviews() {
+        super.layoutSubviews()
+
+        layer.shadowPath = UIBezierPath(rect: bounds).cgPath
+    }
+
+    func configure(item: Item) {
+        configure(container: item.asContainer)
+        configure(element: item.asElement)
+    }
+
+    func configure(container: Container?) {
+        guard let container = container,
+              let containerViewController = containerViewController else { return }
+
+        let source = CollectionDataSource(container: container, containerViewController: containerViewController)
+        let view = CollectionView(source: source)
+
+        configure(view: view)
+    }
+
+    func configure(element: Element?) {
+        guard let element = element else { return }
+
+        let vc = ViewController(element: element)
+        configure(viewController: vc)
+    }
+
+    func configure(view: UIView) {
+        contentView.addSubview(view)
+        view.snp.makeConstraints { make in
+            make.edges.equalToSuperview().priority(999)
+        }
+    }
+
+    func configure(viewController: UIViewController) {
+        guard let containerViewController = containerViewController else { return }
+
+        containerViewController.addChild(viewController)
+        contentView.addSubview(viewController.view)
+        viewController.view.snp.makeConstraints { make in
+            make.edges.equalToSuperview().priority(999)
+        }
+        viewController.didMove(toParent: containerViewController)
+        childViewController = viewController
+    }
+
+    override func prepareForReuse() {
+        super.prepareForReuse()
+
+        guard let childViewController = childViewController else { return }
+
+        childViewController.willMove(toParent: nil)
+        childViewController.view.removeFromSuperview()
+        childViewController.removeFromParent()
+    }
+
+}

Cellorama/Cells/Reusable.swift

@@ -0,0 +1,20 @@
+//
+//  Reusable.swift
+//  Cellorama
+//
+//  Created by Sahel Jalal on 12/16/20.
+//
+
+import Foundation
+
+protocol Reusable {
+
+    static var reuseIdentifier: String { get }
+
+}
+
+extension Reusable {
+
+    static var reuseIdentifier: String { String(describing: type(of: self)) }
+
+}

Cellorama/Cells/TableCell.swift

@@ -0,0 +1,28 @@
+//
+//  TableCell.swift
+//  Cellorama
+//
+//  Created by Sahel Jalal on 12/16/20.
+//
+
+import UIKit
+
+class TableCell: UITableViewCell, Reusable {
+
+    enum Kind {
+        case container
+        case element
+    }
+
+    var kind: Kind
+
+    init(kind: Kind) {
+        self.kind = kind
+        super.init(style: .default, reuseIdentifier: TableCell.reuseIdentifier)
+    }
+
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+}