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kazuhiro4949 · Jul 2, 2017 · 44d16ac · 44d16ac
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diff --git a/PagingKit.xcodeproj/project.pbxproj b/PagingKit.xcodeproj/project.pbxproj
diff --git a/PagingKit.xcodeproj/project.xcworkspace/contents.xcworkspacedata b/PagingKit.xcodeproj/project.xcworkspace/contents.xcworkspacedata
diff --git a/...t.xcodeproj/project.xcworkspace/xcuserdata/Kaz.xcuserdatad/UserInterfaceState.xcuserstate b/...t.xcodeproj/project.xcworkspace/xcuserdata/Kaz.xcuserdatad/UserInterfaceState.xcuserstate
diff --git a/PagingKit.xcodeproj/xcshareddata/xcschemes/PagingKit.xcscheme b/PagingKit.xcodeproj/xcshareddata/xcschemes/PagingKit.xcscheme
@@ -0,0 +1,99 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0830"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "6EC140BA1F0940F40054B514"
+               BuildableName = "PagingKit.framework"
+               BlueprintName = "PagingKit"
+               ReferencedContainer = "container:PagingKit.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "6EC140C31F0940F40054B514"
+               BuildableName = "PagingKitTests.xctest"
+               BlueprintName = "PagingKitTests"
+               ReferencedContainer = "container:PagingKit.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "6EC140BA1F0940F40054B514"
+            BuildableName = "PagingKit.framework"
+            BlueprintName = "PagingKit"
+            ReferencedContainer = "container:PagingKit.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "6EC140BA1F0940F40054B514"
+            BuildableName = "PagingKit.framework"
+            BlueprintName = "PagingKit"
+            ReferencedContainer = "container:PagingKit.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "6EC140BA1F0940F40054B514"
+            BuildableName = "PagingKit.framework"
+            BlueprintName = "PagingKit"
+            ReferencedContainer = "container:PagingKit.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
diff --git a/PagingKit.xcodeproj/xcuserdata/Kaz.xcuserdatad/xcschemes/xcschememanagement.plist b/PagingKit.xcodeproj/xcuserdata/Kaz.xcuserdatad/xcschemes/xcschememanagement.plist
@@ -0,0 +1,27 @@
+<?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>SchemeUserState</key>
+	<dict>
+		<key>PagingKit.xcscheme_^#shared#^_</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>0</integer>
+		</dict>
+	</dict>
+	<key>SuppressBuildableAutocreation</key>
+	<dict>
+		<key>6EC140BA1F0940F40054B514</key>
+		<dict>
+			<key>primary</key>
+			<true/>
+		</dict>
+		<key>6EC140C31F0940F40054B514</key>
+		<dict>
+			<key>primary</key>
+			<true/>
+		</dict>
+	</dict>
+</dict>
+</plist>
diff --git a/PagingKit/Info.plist b/PagingKit/Info.plist
@@ -0,0 +1,24 @@
+<?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>en</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>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>FMWK</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
+	<key>NSPrincipalClass</key>
+	<string></string>
+</dict>
+</plist>
diff --git a/PagingKit/PagingContentViewController.swift b/PagingKit/PagingContentViewController.swift
@@ -0,0 +1,179 @@
+//
+//  PagingContentViewController.swift
+//  PagingViewController
+//
+//  Created by Kazuhiro Hayashi on 7/2/17.
+//  Copyright © 2017 Kazuhiro Hayashi. All rights reserved.
+//
+
+import UIKit
+
+public protocol PagingContentViewControllerDelegate: class {
+
+    func contentViewController(viewController: PagingContentViewController, willBeginScrollFrom index: Int)
+    func contentViewController(viewController: PagingContentViewController, didScrollOn index: Int?, percent: CGFloat)
+    func contentViewController(viewController: PagingContentViewController, didEndScrollFrom previousIndex: Int, to nextIndex: Int, transitionComplete: Bool)
+}
+
+extension PagingContentViewControllerDelegate {
+
+    func contentViewController(viewController: PagingContentViewController, willBeginScrollFrom index: Int){}
+    func contentViewController(viewController: PagingContentViewController, didScrollOn index: Int?, percent: CGFloat) {}
+    func contentViewController(viewController: PagingContentViewController, didEndScrollFrom previousIndex: Int, to nextIndex: Int, transitionComplete: Bool) {}
+}
+
+public protocol PagingContentViewControllerDataSource: class {
+    func numberOfItemForContentViewController(viewController: PagingContentViewController) -> Int
+    func contentViewController(viewController: PagingContentViewController, viewControllerAt Index: Int) -> UIViewController
+}
+
+public class PagingContentViewController: UIViewController {
+    private var cachedViewControllers = [UIViewController?]()
+
+    public weak var delegate: PagingContentViewControllerDelegate?
+    public weak var dataSource: PagingContentViewControllerDataSource?
+
+    public var contentOffsetRatio: CGFloat {
+        return scrollView.contentOffset.x / (scrollView.contentSize.width - scrollView.bounds.width)
+    }
+
+    public var pagingPercent: CGFloat {
+        return scrollView.contentOffset.x.truncatingRemainder(dividingBy: scrollView.bounds.width) / scrollView.bounds.width
+    }
+
+    public func scroll(to page: Int, animated: Bool) {
+        isProgramaticallyScrolling = true
+        let offsetX = scrollView.bounds.width * CGFloat(page)
+        let offset = CGPoint(x: offsetX, y: 0)
+        loadPagesIfNeeded(page: page)
+        scrollView.setContentOffset(offset, animated: animated)
+        if !animated {
+            isProgramaticallyScrolling = false
+        }
+    }
+
+    fileprivate var numberOfPages: Int = 0
+
+    fileprivate var lastContentOffset = CGPoint.zero
+    fileprivate var leftSidePageIndex = 0
+    fileprivate(set) var isProgramaticallyScrolling = false
+
+    fileprivate let scrollView: UIScrollView = {
+        let scrollView = UIScrollView()
+        scrollView.isPagingEnabled = true
+        scrollView.bounces = false
+        scrollView.autoresizingMask = [.flexibleWidth, .flexibleHeight, .flexibleTopMargin, .flexibleLeftMargin]
+        scrollView.translatesAutoresizingMaskIntoConstraints = true
+        return scrollView
+    }()
+
+    override public func viewDidLoad() {
+        super.viewDidLoad()
+
+        scrollView.frame = view.bounds
+        scrollView.delegate = self
+        view.addSubview(scrollView)
+    }
+
+    override public func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+
+        if cachedViewControllers.isEmpty {
+            initialLoad(with: 0)
+        }
+    }
+
+    override public func viewDidLayoutSubviews() {
+        super.viewDidLayoutSubviews()
+        scrollView.contentSize = CGSize(width: view.bounds.size.width * CGFloat(numberOfPages), height: view.bounds.size.height)
+        cachedViewControllers.enumerated().forEach { (offset, vc) in
+            vc?.view.frame = scrollView.bounds
+            vc?.view.frame.origin.x = scrollView.bounds.width * CGFloat(offset)
+        }
+    }
+
+    override public func didReceiveMemoryWarning() {
+        super.didReceiveMemoryWarning()
+    }
+
+    override public func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
+        super.viewWillTransition(to: size, with: coordinator)
+
+        let currentIndex = Int(scrollView.contentOffset.x / scrollView.bounds.width)
+        coordinator.animate(alongsideTransition: { [weak self] (context) in
+            guard let _self = self else { return }
+            _self.initialLoad(with: currentIndex)
+
+            let point = CGPoint(x: _self.scrollView.bounds.width * CGFloat(currentIndex), y: 0)
+            _self.scrollView.setContentOffset(point, animated: false)
+        }) { (context) in }
+    }
+
+    fileprivate func initialLoad(with page: Int) {
+        scrollView.subviews.forEach { $0.removeFromSuperview() }
+        childViewControllers.forEach { $0.removeFromParentViewController() }
+
+        numberOfPages = dataSource?.numberOfItemForContentViewController(viewController: self) ?? 0
+        cachedViewControllers = Array(repeating: nil, count: numberOfPages)
+
+        loadScrollView(with: page - 1)
+        loadScrollView(with: page)
+        loadScrollView(with: page + 1)
+    }
+
+    fileprivate func loadScrollView(with page: Int) {
+        guard (0..<cachedViewControllers.count) ~= page else { return }
+
+        if case nil = cachedViewControllers[page], let dataSource = dataSource {
+            let vc = dataSource.contentViewController(viewController: self, viewControllerAt: page)
+            addChildViewController(vc)
+            vc.view.frame = scrollView.bounds
+            vc.view.frame.origin.x = scrollView.bounds.width * CGFloat(page)
+            scrollView.addSubview(vc.view)
+            vc.didMove(toParentViewController: self)
+            cachedViewControllers[page] = vc
+        }
+    }
+}
+
+extension PagingContentViewController: UIScrollViewDelegate {
+    public func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
+        guard !isProgramaticallyScrolling else { return }
+
+        delegate?.contentViewController(viewController: self, willBeginScrollFrom: leftSidePageIndex)
+    }
+
+    public func scrollViewDidScroll(_ scrollView: UIScrollView) {
+        guard !isProgramaticallyScrolling else { return }
+
+        let leftSideContentOffset = CGFloat(leftSidePageIndex) * scrollView.bounds.width
+        let percent = (scrollView.contentOffset.x - leftSideContentOffset) / scrollView.bounds.width
+
+        delegate?.contentViewController(viewController: self, didScrollOn: leftSidePageIndex, percent: min(max(0, percent), 1))
+
+        lastContentOffset = scrollView.contentOffset
+        leftSidePageIndex = Int(scrollView.contentOffset.x / scrollView.bounds.width)
+    }
+
+    public func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
+        loadPagesIfNeeded()
+    }
+
+    public func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
+        if !decelerate {
+            loadPagesIfNeeded()
+        }
+    }
+
+    public func scrollViewDidEndScrollingAnimation(_ scrollView: UIScrollView) {
+        isProgramaticallyScrolling = false
+    }
+
+    fileprivate func loadPagesIfNeeded(page: Int? = nil) {
+        let currentIndex = Int(scrollView.contentOffset.x / scrollView.bounds.width)
+        let loadingPage = page ?? currentIndex
+        loadScrollView(with: loadingPage - 1)
+        loadScrollView(with: loadingPage)
+        loadScrollView(with: loadingPage + 1)
+    }
+}
diff --git a/PagingKit/PagingKit.h b/PagingKit/PagingKit.h
@@ -0,0 +1,19 @@
+//
+//  PagingKit.h
+//  PagingKit
+//
+//  Created by Kazuhiro Hayashi on 7/2/17.
+//  Copyright © 2017 Kazuhiro Hayashi. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+//! Project version number for PagingKit.
+FOUNDATION_EXPORT double PagingKitVersionNumber;
+
+//! Project version string for PagingKit.
+FOUNDATION_EXPORT const unsigned char PagingKitVersionString[];
+
+// In this header, you should import all the public headers of your framework using statements like #import <PagingKit/PublicHeader.h>
+
+