Update iOS example

Examples/Example-iOS/Sources/AppDelegate.swift

@@ -5,11 +5,25 @@ final class AppDelegate: UIResponder, UIApplicationDelegate {
     var window: UIWindow?
 
     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
+        configureUIAppearance()
+
         let window = UIWindow()
         let navigationController = UINavigationController(rootViewController: HomeViewController())
         window.rootViewController = navigationController
         window.makeKeyAndVisible()
         self.window = window
         return true
     }
+
+    func configureUIAppearance() {
+        let appearance = UINavigationBar.appearance()
+        let titleTextAttributes: [NSAttributedString.Key: Any] = [
+            .foregroundColor: UIColor.black
+        ]
+
+        appearance.tintColor = .darkText
+        appearance.prefersLargeTitles = true
+        appearance.titleTextAttributes = titleTextAttributes
+        appearance.largeTitleTextAttributes = titleTextAttributes
+    }
 }

Examples/Example-iOS/Sources/Common/NibLoadable.swift

@@ -0,0 +1,26 @@
+import UIKit
+
+protocol NibLoadable: class {
+    static var nibName: String { get }
+    static var nibBundle: Bundle? { get }
+}
+
+extension NibLoadable {
+    static var nib: UINib {
+        return UINib(nibName: nibName, bundle: nibBundle)
+    }
+
+    static var nibName: String {
+        return String(describing: self)
+    }
+
+    static var nibBundle: Bundle? {
+        return Bundle(for: self)
+    }
+}
+
+extension NibLoadable where Self: UIView {
+    static func loadFromNib() -> Self {
+        return nib.instantiate(withOwner: nil, options: nil).first as! Self
+    }
+}

Examples/Example-iOS/Sources/Common/Reusable.swift

@@ -0,0 +1,11 @@
+protocol Reusable: class {
+    static var reuseIdentifier: String { get }
+}
+
+extension Reusable {
+    static var reuseIdentifier: String {
+        return String(reflecting: self)
+    }
+}
+
+typealias NibReusable = NibLoadable & Reusable

Examples/Example-iOS/Sources/Common/ReusableViewExtensions.swift

@@ -0,0 +1,65 @@
+import UIKit
+
+extension UITableView {
+    func register<T: UITableViewCell>(cellType: T.Type) where T: NibReusable {
+        register(T.nib, forCellReuseIdentifier: T.reuseIdentifier)
+    }
+
+    func register<T: UITableViewCell>(cellType: T.Type) where T: Reusable {
+        register(T.self, forCellReuseIdentifier: T.reuseIdentifier)
+    }
+
+    func register<T: UITableViewHeaderFooterView>(viewType: T.Type) where T: NibReusable {
+        register(T.nib, forHeaderFooterViewReuseIdentifier: T.reuseIdentifier)
+    }
+
+    func register<T: UITableViewHeaderFooterView>(viewType: T.Type) where T: Reusable {
+        register(T.self, forHeaderFooterViewReuseIdentifier: T.reuseIdentifier)
+    }
+
+    func dequeueReusableCell<T: UITableViewCell>(for indexPath: IndexPath, cellType: T.Type = T.self) -> T where T: Reusable {
+        guard let cell = dequeueReusableCell(withIdentifier: T.reuseIdentifier, for: indexPath) as? T else {
+            fatalError()
+        }
+        return cell
+    }
+
+    func dequeueReusableHeaderFooterView<T: UITableViewHeaderFooterView>(viewType: T.Type = T.self) -> T where T: Reusable {
+        guard let view = dequeueReusableHeaderFooterView(withIdentifier: T.reuseIdentifier) as? T else {
+            fatalError()
+        }
+        return view
+    }
+}
+
+extension UICollectionView {
+    func register<T: UICollectionViewCell>(cellType: T.Type) where T: NibReusable {
+        register(T.nib, forCellWithReuseIdentifier: T.reuseIdentifier)
+    }
+
+    func register<T: UICollectionViewCell>(cellType: T.Type) where T: Reusable {
+        register(T.self, forCellWithReuseIdentifier: T.reuseIdentifier)
+    }
+
+    func register<T: UICollectionReusableView>(viewType: T.Type, forSupplementaryViewOfKind kind: String) where T: NibReusable {
+        register(T.nib, forSupplementaryViewOfKind: kind, withReuseIdentifier: T.reuseIdentifier)
+    }
+
+    func register<T: UICollectionReusableView>(viewType: T.Type, forSupplementaryViewOfKind kind: String) where T: Reusable {
+        register(T.self, forSupplementaryViewOfKind: kind, withReuseIdentifier: T.reuseIdentifier)
+    }
+
+    func dequeueReusableCell<T: UICollectionViewCell>(for indexPath: IndexPath, cellType: T.Type = T.self) -> T where T: Reusable {
+        guard let cell = dequeueReusableCell(withReuseIdentifier: cellType.reuseIdentifier, for: indexPath) as? T else {
+            fatalError()
+        }
+        return cell
+    }
+
+    func dequeueReusableSupplementaryView<T: UICollectionReusableView>(ofKind kind: String, for indexPath: IndexPath, viewType: T.Type = T.self) -> T where T: Reusable {
+        guard let view = dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: T.reuseIdentifier, for: indexPath) as? T else {
+            fatalError()
+        }
+        return view
+    }
+}

Examples/Example-iOS/Sources/String+Differentiable.swift → Examples/Example-iOS/Sources/Common/StringExtensions.swift

@@ -1,4 +1,3 @@
-import UIKit
 import DifferenceKit
 
 extension String: Differentiable {}

Examples/Example-iOS/Sources/HeaderFooter/HeaderFooterCell.swift

@@ -0,0 +1,3 @@
+import UIKit
+
+final class HeaderFooterPlainCell: UITableViewCell, Reusable {}

Examples/Example-iOS/Sources/HeaderFooter/HeaderFooterMoreView.swift

@@ -0,0 +1,9 @@
+import UIKit
+
+final class HeaderFooterMoreView: UITableViewHeaderFooterView, NibReusable {
+    var onMorePressed: (() -> Void)?
+
+    @IBAction func handleMorePressed() {
+        onMorePressed?()
+    }
+}

Examples/Example-iOS/Sources/HeaderFooter/HeaderFooterMoreView.xib

@@ -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>
+        <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"/>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <view contentMode="scaleToFill" id="9Un-o1-tzh" customClass="HeaderFooterMoreView" customModule="Example_iOS" customModuleProvider="target">
+            <rect key="frame" x="0.0" y="0.0" width="414" height="44"/>
+            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+            <subviews>
+                <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="l5o-Rr-49h">
+                    <rect key="frame" x="0.0" y="0.0" width="414" height="44"/>
+                    <fontDescription key="fontDescription" type="system" pointSize="18"/>
+                    <state key="normal" title="More"/>
+                    <connections>
+                        <action selector="handleMorePressed" destination="-2" eventType="touchUpInside" id="zzb-Pr-W6j"/>
+                    </connections>
+                </button>
+            </subviews>
+            <constraints>
+                <constraint firstItem="l5o-Rr-49h" firstAttribute="top" secondItem="9Un-o1-tzh" secondAttribute="top" id="6LZ-tU-yN1"/>
+                <constraint firstAttribute="bottom" secondItem="l5o-Rr-49h" secondAttribute="bottom" id="LQK-iA-9FV"/>
+                <constraint firstAttribute="trailing" secondItem="l5o-Rr-49h" secondAttribute="trailing" id="amX-Pz-M4V"/>
+                <constraint firstItem="l5o-Rr-49h" firstAttribute="leading" secondItem="9Un-o1-tzh" secondAttribute="leading" id="exN-an-G2q"/>
+            </constraints>
+            <freeformSimulatedSizeMetrics key="simulatedDestinationMetrics"/>
+            <viewLayoutGuide key="safeArea" id="0jJ-Kp-0ak"/>
+            <point key="canvasLocation" x="-42" y="-30"/>
+        </view>
+    </objects>
+</document>

Examples/Example-iOS/Sources/HeaderFooter/HeaderFooterSectionModel.swift

@@ -0,0 +1,14 @@
+import DifferenceKit
+
+struct HeaderFooterSectionModel: Differentiable, Equatable {
+    var id: Int
+    var hasFooter: Bool
+
+    var differenceIdentifier: Int {
+        return id
+    }
+
+    var headerTitle: String {
+        return "Section \(id)"
+    }
+}

Examples/Example-iOS/Sources/HeaderFooter/HeaderFooterViewController.swift

@@ -0,0 +1,90 @@
+import UIKit
+import DifferenceKit
+
+final class HeaderFooterViewController: UITableViewController {
+    typealias Section = ArraySection<HeaderFooterSectionModel, String>
+
+    private var data = [Section]()
+
+    private var dataInput: [Section] {
+        get { return data }
+        set {
+            let changeset = StagedChangeset(source: data, target: newValue)
+            tableView.reload(using: changeset, with: .fade) { data in
+                self.data = data
+            }
+        }
+    }
+
+    private let allTexts = (0x0041...0x005A).compactMap { UnicodeScalar($0).map(String.init) }
+
+    @objc private func refresh() {
+        let model = HeaderFooterSectionModel(id: 0, hasFooter: true)
+        let section = Section(model: model, elements: allTexts.prefix(7))
+        dataInput = [section]
+    }
+
+    private func showMore(in sectionIndex: Int) {
+        var section = dataInput[sectionIndex]
+        let texts = allTexts.dropFirst(section.elements.count).prefix(7)
+        section.elements.append(contentsOf: texts)
+        section.model.hasFooter = section.elements.count < allTexts.count
+        dataInput[sectionIndex] = section
+
+        let lastIndex = section.elements.index(before: section.elements.endIndex)
+        let lastIndexPath = IndexPath(row: lastIndex, section: sectionIndex)
+        tableView.scrollToRow(at: lastIndexPath, at: .bottom, animated: true)
+    }
+
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+        refresh()
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        title = "Header Footer"
+        tableView.allowsSelection = false
+
+        tableView.register(cellType: HeaderFooterPlainCell.self)
+        tableView.register(viewType: HeaderFooterMoreView.self)
+
+        navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .refresh, target: self, action: #selector(refresh))
+    }
+}
+
+extension HeaderFooterViewController {
+    override func numberOfSections(in tableView: UITableView) -> Int {
+        return data.count
+    }
+
+    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+        return data[section].elements.count
+    }
+
+    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
+        let cell: HeaderFooterPlainCell = tableView.dequeueReusableCell(for: indexPath)
+        cell.textLabel?.text = data[indexPath.section].elements[indexPath.row]
+        return cell
+    }
+
+    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
+        return data[section].model.headerTitle
+    }
+
+    override func tableView(_ tableView: UITableView, viewForFooterInSection section: Int) -> UIView? {
+        guard data[section].model.hasFooter else { return nil }
+
+        let view: HeaderFooterMoreView = tableView.dequeueReusableHeaderFooterView()
+        view.onMorePressed = { [weak self] in
+            self?.showMore(in: section)
+        }
+
+        return view
+    }
+
+    override func tableView(_ tableView: UITableView, heightForFooterInSection section: Int) -> CGFloat {
+        return data[section].model.hasFooter ? 44 : 0
+    }
+}