Initial commit

2019-06-24 05:49:24 +09:00
commit 3e216e1aa4
98 changed files with 12591 additions and 0 deletions
@@ -0,0 +1,17 @@
+import UIKit
+
+@UIApplicationMain
+final class AppDelegate: UIResponder, UIApplicationDelegate {
+    var window: UIWindow?
+
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil) -> Bool {
+        let window = UIWindow()
+        let navigationController = UINavigationController(rootViewController: TopViewController())
+        navigationController.navigationBar.tintColor = .black
+        window.rootViewController = navigationController
+        window.makeKeyAndVisible()
+        self.window = window
+
+        return true
+    }
+}
@@ -0,0 +1,98 @@
+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "83.5x83.5",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "size" : "1024x1024",
+      "scale" : "1x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <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="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>
@@ -0,0 +1,13 @@
+import UIKit
+
+extension UITableViewCell {
+    static var name: String {
+        return String(describing: self)
+    }
+}
+
+extension UICollectionViewCell {
+    static var name: String {
+        return String(describing: self)
+    }
+}
@@ -0,0 +1,43 @@
+<?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>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string></string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>
@@ -0,0 +1,172 @@
+import UIKit
+import DiffableDataSources
+
+final class InsertionSortViewController: UIViewController {
+    final class Section: Hashable {
+        var id = UUID()
+        var nodes: [Node]
+        private(set) var isSorted = false
+        private var currentIndex = 1
+
+        init(count: Int) {
+            nodes = (0..<count).map { Node(value: $0, maxValue: count) }.shuffled()
+        }
+
+        func hash(into hasher: inout Hasher) {
+            hasher.combine(id)
+        }
+
+        func sortNext() {
+            guard !isSorted, nodes.count > 1 else {
+                return isSorted = true
+            }
+
+            var index = currentIndex
+            let currentNode = nodes[index]
+            index -= 1
+
+            while index >= 0 && currentNode.value < nodes[index].value {
+                let node = nodes[index]
+                nodes[index] = currentNode
+                nodes[index + 1] = node
+                index -= 1
+            }
+
+            currentIndex += 1
+
+            if currentIndex >= nodes.count {
+                isSorted = true
+            }
+        }
+
+        static func == (lhs: Section, rhs: Section) -> Bool {
+            return lhs.id == rhs.id
+        }
+    }
+
+    struct Node: Hashable {
+        var id = UUID()
+        var value: Int
+        var color: UIColor
+
+        init(value: Int, maxValue: Int) {
+            let hue = CGFloat(value) / CGFloat(maxValue)
+            self.value = value
+            color = UIColor(hue: hue, saturation: 1, brightness: 1, alpha: 1)
+            id = UUID()
+        }
+
+        func hash(into hasher: inout Hasher) {
+            hasher.combine(id)
+        }
+
+        static func == (lhs: Node, rhs: Node) -> Bool {
+            return lhs.id == rhs.id
+        }
+    }
+
+    @IBOutlet private var collectionView: UICollectionView!
+    private var isSorting = false
+
+    let nodeSize = CGSize(width: 16, height: 34)
+
+    private lazy var dataSource = CollectionViewDiffableDataSource<Section, Node>(collectionView: collectionView) { collectionView, indexPath, node in
+        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: UICollectionViewCell.name, for: indexPath)
+        cell.backgroundColor = node.color
+        return cell
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        title = "Insertion Sort"
+
+        collectionView.delegate = self
+        collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: UICollectionViewCell.name)
+        navigationItem.rightBarButtonItem = UIBarButtonItem(title: nil, style: .plain, target: self, action: #selector(toggleSort))
+
+        updateSortButtonTitle()
+    }
+
+    override func viewDidLayoutSubviews() {
+        super.viewDidLayoutSubviews()
+        randmize(animated: false)
+    }
+
+    @objc func toggleSort() {
+        isSorting.toggle()
+        updateSortButtonTitle()
+
+        if isSorting {
+            startInsertionSort()
+        }
+    }
+
+    func updateSortButtonTitle() {
+        navigationItem.rightBarButtonItem?.title = isSorting ? "Stop" : "Sort"
+    }
+
+    func randmize(animated: Bool) {
+        let snapshot = DiffableDataSourceSnapshot<Section, Node>()
+        let rows = Int(collectionView.bounds.height / nodeSize.height) - 1
+        let columns = Int(collectionView.bounds.width / nodeSize.width)
+
+        for _ in 0..<rows {
+            let section = Section(count: columns)
+            snapshot.appendSections([section])
+            snapshot.appendItems(section.nodes)
+        }
+
+        dataSource.apply(snapshot, animatingDifferences: animated)
+    }
+
+    func startInsertionSort() {
+        guard isSorting else {
+            return
+        }
+
+        var isNextSortRequired = false
+        let snapshot = dataSource.snapshot()
+
+        for section in snapshot.sectionIdentifiers where !section.isSorted {
+            section.sortNext()
+            let items = section.nodes
+            snapshot.deleteItems(items)
+            snapshot.appendItems(items, toSection: section)
+            isNextSortRequired = true
+        }
+
+        if isNextSortRequired {
+            dataSource.apply(snapshot)
+        }
+
+        DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(isNextSortRequired ? 150 : 1000)) { [weak self] in
+            guard let self = self else {
+                return
+            }
+
+            if !isNextSortRequired {
+                self.randmize(animated: false)
+            }
+            self.startInsertionSort()
+        }
+    }
+}
+
+extension InsertionSortViewController: UICollectionViewDelegateFlowLayout {
+    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 0
+    }
+
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
+        return .zero
+    }
+
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
+        return nodeSize
+    }
+}
@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="14490.70" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
+    <device id="retina6_1" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14490.49"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="InsertionSortViewController" customModule="Example_iOS" customModuleProvider="target">
+            <connections>
+                <outlet property="collectionView" destination="6GZ-26-LaT" id="93h-pF-UdX"/>
+                <outlet property="view" destination="iN0-l3-epB" id="SEV-ah-gIe"/>
+            </connections>
+        </placeholder>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <view contentMode="scaleToFill" id="iN0-l3-epB">
+            <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
+            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+            <subviews>
+                <collectionView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" bounces="NO" showsHorizontalScrollIndicator="NO" showsVerticalScrollIndicator="NO" bouncesZoom="NO" dataMode="none" translatesAutoresizingMaskIntoConstraints="NO" id="6GZ-26-LaT">
+                    <rect key="frame" x="0.0" y="44" width="414" height="852"/>
+                    <color key="backgroundColor" white="0.0" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                    <collectionViewFlowLayout key="collectionViewLayout" minimumLineSpacing="10" minimumInteritemSpacing="10" id="IOA-0B-TAt">
+                        <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>
+                </collectionView>
+            </subviews>
+            <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+            <constraints>
+                <constraint firstItem="6GZ-26-LaT" firstAttribute="top" secondItem="vUN-kp-3ea" secondAttribute="top" id="N1l-xD-bVR"/>
+                <constraint firstAttribute="trailing" secondItem="6GZ-26-LaT" secondAttribute="trailing" id="WAV-gN-b0a"/>
+                <constraint firstAttribute="bottom" secondItem="6GZ-26-LaT" secondAttribute="bottom" id="cwF-t5-pdY"/>
+                <constraint firstItem="6GZ-26-LaT" firstAttribute="leading" secondItem="iN0-l3-epB" secondAttribute="leading" id="lef-dU-E4k"/>
+            </constraints>
+            <viewLayoutGuide key="safeArea" id="vUN-kp-3ea"/>
+        </view>
+    </objects>
+</document>
@@ -0,0 +1,12 @@
+import UIKit
+
+final class LabelCell: UICollectionViewCell {
+    @IBOutlet var label: UILabel!
+
+    override func awakeFromNib() {
+        super.awakeFromNib()
+
+        layer.borderWidth = 1
+        layer.borderColor = UIColor.gray.cgColor
+    }
+}
@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="14490.70" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
+    <device id="retina6_1" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14490.49"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" id="pYo-4D-KR8" customClass="LabelCell" customModule="Example_iOS" customModuleProvider="target">
+            <rect key="frame" x="0.0" y="0.0" width="300" height="32"/>
+            <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="300" height="32"/>
+                <autoresizingMask key="autoresizingMask"/>
+                <subviews>
+                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="qKi-9G-J20">
+                        <rect key="frame" x="10" y="0.0" width="280" height="32"/>
+                        <fontDescription key="fontDescription" style="UICTFontTextStyleBody"/>
+                        <nil key="textColor"/>
+                        <nil key="highlightedColor"/>
+                    </label>
+                </subviews>
+            </view>
+            <constraints>
+                <constraint firstItem="qKi-9G-J20" firstAttribute="leading" secondItem="pYo-4D-KR8" secondAttribute="leading" constant="10" id="UJN-ZW-lz4"/>
+                <constraint firstAttribute="trailing" secondItem="qKi-9G-J20" secondAttribute="trailing" constant="10" id="VbK-qH-sMr"/>
+                <constraint firstItem="qKi-9G-J20" firstAttribute="top" secondItem="pYo-4D-KR8" secondAttribute="top" id="YkZ-vn-KK6"/>
+                <constraint firstAttribute="bottom" secondItem="qKi-9G-J20" secondAttribute="bottom" id="au1-M8-Hh2"/>
+            </constraints>
+            <viewLayoutGuide key="safeArea" id="wQ5-Q0-9Pt"/>
+            <connections>
+                <outlet property="label" destination="qKi-9G-J20" id="hp7-fh-rao"/>
+            </connections>
+            <point key="canvasLocation" x="-1" y="74"/>
+        </collectionViewCell>
+    </objects>
+</document>
@@ -0,0 +1,84 @@
+import UIKit
+import DiffableDataSources
+
+final class MountainsViewController: UIViewController {
+    enum Section {
+        case main
+    }
+
+    struct Mountain: Hashable {
+        var name: String
+
+        func contains(_ filter: String) -> Bool {
+            guard !filter.isEmpty else {
+                return true
+            }
+
+            let lowercasedFilter = filter.lowercased()
+            return name.lowercased().contains(lowercasedFilter)
+        }
+    }
+
+    @IBOutlet private var searchBar: UISearchBar!
+    @IBOutlet private var collectionView: UICollectionView!
+
+    private lazy var dataSource = CollectionViewDiffableDataSource<Section, Mountain>(collectionView: collectionView) { collectionView, indexPath, mountain in
+        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: LabelCell.name, for: indexPath) as! LabelCell
+        cell.label.text = mountain.name
+        return cell
+    }
+
+    private let allMountains: [Mountain] = mountainsRawData.components(separatedBy: .newlines).map { line in
+        let name = line.components(separatedBy: ",")[0]
+        return Mountain(name: name)
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        title = "Mountains Search"
+
+        searchBar.delegate = self
+        collectionView.delegate = self
+        collectionView.register(UINib(nibName: LabelCell.name, bundle: .main), forCellWithReuseIdentifier: LabelCell.name)
+
+        search(filter: "")
+    }
+
+    func search(filter: String) {
+        let mountains = allMountains.lazy
+            .filter { $0.contains(filter) }
+            .sorted { $0.name < $1.name }
+
+        let snapshot = DiffableDataSourceSnapshot<Section, Mountain>()
+        snapshot.appendSections([.main])
+        snapshot.appendItems(mountains)
+        dataSource.apply(snapshot)
+    }
+}
+
+extension MountainsViewController: UISearchBarDelegate {
+    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
+        search(filter: searchText)
+    }
+}
+
+extension MountainsViewController: UICollectionViewDelegateFlowLayout {
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
+        return 10
+    }
+
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
+        return 10
+    }
+
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
+        return UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
+    }
+
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
+        let column = 2
+        let width = (collectionView.bounds.width - 10 * CGFloat(column + 1)) / CGFloat(column)
+        return CGSize(width: width, height: 32)
+    }
+}
@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="14490.70" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
+    <device id="retina6_1" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14490.49"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="MountainsViewController" customModule="DiffableDataSourcesExample_iOS" customModuleProvider="target">
+            <connections>
+                <outlet property="collectionView" destination="kRf-0w-rJc" id="OBe-Sd-A2L"/>
+                <outlet property="searchBar" destination="t4I-uz-ABD" id="NtR-qE-qZn"/>
+                <outlet property="view" destination="a1D-Hd-aJU" id="Oyu-9w-QKH"/>
+            </connections>
+        </placeholder>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <view contentMode="scaleToFill" id="a1D-Hd-aJU">
+            <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
+            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+            <subviews>
+                <searchBar contentMode="redraw" translatesAutoresizingMaskIntoConstraints="NO" id="t4I-uz-ABD">
+                    <rect key="frame" x="0.0" y="44" width="414" height="56"/>
+                    <textInputTraits key="textInputTraits"/>
+                </searchBar>
+                <collectionView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" keyboardDismissMode="onDrag" dataMode="none" translatesAutoresizingMaskIntoConstraints="NO" id="kRf-0w-rJc">
+                    <rect key="frame" x="0.0" y="120" width="414" height="776"/>
+                    <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                    <collectionViewFlowLayout key="collectionViewLayout" minimumLineSpacing="0.0" minimumInteritemSpacing="0.0" id="vHO-Ju-ApP">
+                        <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>
+                </collectionView>
+            </subviews>
+            <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+            <constraints>
+                <constraint firstAttribute="bottom" secondItem="kRf-0w-rJc" secondAttribute="bottom" id="CBM-WJ-k93"/>
+                <constraint firstItem="t4I-uz-ABD" firstAttribute="leading" secondItem="a1D-Hd-aJU" secondAttribute="leading" id="H5j-5C-2jy"/>
+                <constraint firstAttribute="trailing" secondItem="kRf-0w-rJc" secondAttribute="trailing" id="Hog-jr-nJY"/>
+                <constraint firstItem="t4I-uz-ABD" firstAttribute="top" secondItem="ujY-YI-BSN" secondAttribute="top" id="IkY-zg-lm8"/>
+                <constraint firstItem="kRf-0w-rJc" firstAttribute="top" secondItem="t4I-uz-ABD" secondAttribute="bottom" constant="20" id="aJ9-Wc-4Jd"/>
+                <constraint firstAttribute="trailing" secondItem="t4I-uz-ABD" secondAttribute="trailing" id="d5P-My-ReY"/>
+                <constraint firstItem="kRf-0w-rJc" firstAttribute="leading" secondItem="a1D-Hd-aJU" secondAttribute="leading" id="esv-zM-Pc2"/>
+            </constraints>
+            <viewLayoutGuide key="safeArea" id="ujY-YI-BSN"/>
+            <point key="canvasLocation" x="17" y="173"/>
+        </view>
+    </objects>
+</document>
@@ -0,0 +1,82 @@
+import UIKit
+import DiffableDataSources
+
+final class TopViewController: UIViewController {
+    enum Section {
+        case main
+    }
+
+    enum Item {
+        case mountains
+        case insertionSort
+    }
+
+    @IBOutlet private var tableView: UITableView!
+
+    private lazy var dataSource = TableViewDiffableDataSource<Section, Item>(tableView: tableView) { tableView, indexPath, item in
+        let cell = tableView.dequeueReusableCell(withIdentifier: UITableViewCell.name, for: indexPath)
+        cell.textLabel?.text = item.title
+        cell.accessoryType = .disclosureIndicator
+        return cell
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        title = "DiffableDataSources"
+
+        tableView.delegate = self
+        tableView.register(UITableViewCell.self, forCellReuseIdentifier: UITableViewCell.name)
+        tableView.rowHeight = 60
+        tableView.contentInset.top = 30
+
+        reset()
+    }
+
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+
+        if let indexPath = tableView.indexPathForSelectedRow {
+            tableView.deselectRow(at: indexPath, animated: true)
+        }
+    }
+
+    func reset() {
+        let snapshot = DiffableDataSourceSnapshot<Section, Item>()
+        snapshot.appendSections([.main])
+        snapshot.appendItems([.mountains, .insertionSort])
+        dataSource.apply(snapshot)
+    }
+}
+
+extension TopViewController: UITableViewDelegate {
+    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        guard let item = dataSource.itemIdentifier(for: indexPath) else {
+            return
+        }
+
+        let viewController: UIViewController
+
+        switch item {
+        case .mountains:
+            viewController = MountainsViewController()
+
+        case .insertionSort:
+            viewController = InsertionSortViewController()
+        }
+
+        navigationController?.pushViewController(viewController, animated: true)
+    }
+}
+
+private extension TopViewController.Item {
+    var title: String {
+        switch self {
+        case .mountains:
+            return "🗻 Mountains"
+
+        case .insertionSort:
+            return "📱 Insertion Sort"
+        }
+    }
+}
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="14490.70" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
+    <device id="retina6_1" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14490.49"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="TopViewController" customModule="Example_iOS" customModuleProvider="target">
+            <connections>
+                <outlet property="tableView" destination="tX9-V1-EJv" id="EHH-CF-6fE"/>
+                <outlet property="view" destination="Ude-8O-7bT" id="VCy-jI-QZK"/>
+            </connections>
+        </placeholder>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <view contentMode="scaleToFill" id="Ude-8O-7bT">
+            <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
+            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+            <subviews>
+                <tableView clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" style="plain" separatorStyle="default" rowHeight="-1" estimatedRowHeight="-1" sectionHeaderHeight="28" sectionFooterHeight="28" translatesAutoresizingMaskIntoConstraints="NO" id="tX9-V1-EJv">
+                    <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
+                    <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                </tableView>
+            </subviews>
+            <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+            <constraints>
+                <constraint firstAttribute="bottom" secondItem="tX9-V1-EJv" secondAttribute="bottom" id="0fN-0u-kPN"/>
+                <constraint firstItem="tX9-V1-EJv" firstAttribute="top" secondItem="Ude-8O-7bT" secondAttribute="top" id="NML-7Q-dfc"/>
+                <constraint firstItem="tX9-V1-EJv" firstAttribute="leading" secondItem="Ude-8O-7bT" secondAttribute="leading" id="h66-Ya-k2Y"/>
+                <constraint firstAttribute="trailing" secondItem="tX9-V1-EJv" secondAttribute="trailing" id="phG-hF-KAp"/>
+            </constraints>
+            <viewLayoutGuide key="safeArea" id="iZn-f5-WVt"/>
+            <point key="canvasLocation" x="68" y="141"/>
+        </view>
+    </objects>
+</document>