├── DynamicHorizontalScrollingShelves.xcodeproj
    ├── project.pbxproj
    ├── project.xcworkspace
    │   └── contents.xcworkspacedata
    └── xcuserdata
    │   └── charleschandler.xcuserdatad
    │       ├── xcdebugger
    │           └── Breakpoints_v2.xcbkptlist
    │       └── xcschemes
    │           └── xcschememanagement.plist
└── DynamicHorizontalScrollingShelves
    ├── AppDelegate.swift
    ├── Assets.xcassets
        └── AppIcon.appiconset
        │   └── Contents.json
    ├── Base.lproj
        ├── LaunchScreen.storyboard
        └── Main.storyboard
    ├── Constants.swift
    ├── DynamicHeightCalculable.swift
    ├── ExampleCell.swift
    ├── ExampleCell.xib
    ├── ExampleData.swift
    ├── ExampleModel.swift
    ├── ExampleViewModel.swift
    ├── Info.plist
    └── ViewController.swift


/DynamicHorizontalScrollingShelves.xcodeproj/project.pbxproj:
--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
/DynamicHorizontalScrollingShelves.xcodeproj/project.xcworkspace/contents.xcworkspacedata:
--------------------------------------------------------------------------------
1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <Workspace
3 |    version = "1.0">
4 |    <FileRef
5 |       location = "self:DynamicHorizontalScrollingShelves.xcodeproj">
6 |    </FileRef>
7 | </Workspace>
8 | 


--------------------------------------------------------------------------------
/DynamicHorizontalScrollingShelves.xcodeproj/xcuserdata/charleschandler.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist:
--------------------------------------------------------------------------------
1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <Bucket
3 |    type = "1"
4 |    version = "2.0">
5 | </Bucket>
6 | 


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/DynamicHorizontalScrollingShelves.xcodeproj/xcuserdata/charleschandler.xcuserdatad/xcschemes/xcschememanagement.plist:
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 4 | <dict>
 5 | 	<key>SchemeUserState</key>
 6 | 	<dict>
 7 | 		<key>DynamicHorizontalScrollingShelves.xcscheme</key>
 8 | 		<dict>
 9 | 			<key>orderHint</key>
10 | 			<integer>0</integer>
11 | 		</dict>
12 | 	</dict>
13 | </dict>
14 | </plist>
15 | 


--------------------------------------------------------------------------------
/DynamicHorizontalScrollingShelves/AppDelegate.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.swift
 3 | //  DynamicHorizontalScrollingShelves
 4 | //
 5 | //  Created by Charles Chandler on 2/19/18.
 6 | //  Copyright © 2018 Charles Chandler. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | @UIApplicationMain
12 | class AppDelegate: UIResponder, UIApplicationDelegate {
13 | 
14 |     var window: UIWindow?
15 | 
16 | 
17 |     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
18 |         // Override point for customization after application launch.
19 |         return true
20 |     }
21 | 
22 |     func applicationWillResignActive(_ application: UIApplication) {
23 |         // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
24 |         // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
25 |     }
26 | 
27 |     func applicationDidEnterBackground(_ application: UIApplication) {
28 |         // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
29 |         // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
30 |     }
31 | 
32 |     func applicationWillEnterForeground(_ application: UIApplication) {
33 |         // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
34 |     }
35 | 
36 |     func applicationDidBecomeActive(_ application: UIApplication) {
37 |         // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
38 |     }
39 | 
40 |     func applicationWillTerminate(_ application: UIApplication) {
41 |         // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
42 |     }
43 | 
44 | 
45 | }
46 | 
47 | 


--------------------------------------------------------------------------------
/DynamicHorizontalScrollingShelves/Assets.xcassets/AppIcon.appiconset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "iphone",
 5 |       "size" : "20x20",
 6 |       "scale" : "2x"
 7 |     },
 8 |     {
 9 |       "idiom" : "iphone",
10 |       "size" : "20x20",
11 |       "scale" : "3x"
12 |     },
13 |     {
14 |       "idiom" : "iphone",
15 |       "size" : "29x29",
16 |       "scale" : "2x"
17 |     },
18 |     {
19 |       "idiom" : "iphone",
20 |       "size" : "29x29",
21 |       "scale" : "3x"
22 |     },
23 |     {
24 |       "idiom" : "iphone",
25 |       "size" : "40x40",
26 |       "scale" : "2x"
27 |     },
28 |     {
29 |       "idiom" : "iphone",
30 |       "size" : "40x40",
31 |       "scale" : "3x"
32 |     },
33 |     {
34 |       "idiom" : "iphone",
35 |       "size" : "60x60",
36 |       "scale" : "2x"
37 |     },
38 |     {
39 |       "idiom" : "iphone",
40 |       "size" : "60x60",
41 |       "scale" : "3x"
42 |     },
43 |     {
44 |       "idiom" : "ipad",
45 |       "size" : "20x20",
46 |       "scale" : "1x"
47 |     },
48 |     {
49 |       "idiom" : "ipad",
50 |       "size" : "20x20",
51 |       "scale" : "2x"
52 |     },
53 |     {
54 |       "idiom" : "ipad",
55 |       "size" : "29x29",
56 |       "scale" : "1x"
57 |     },
58 |     {
59 |       "idiom" : "ipad",
60 |       "size" : "29x29",
61 |       "scale" : "2x"
62 |     },
63 |     {
64 |       "idiom" : "ipad",
65 |       "size" : "40x40",
66 |       "scale" : "1x"
67 |     },
68 |     {
69 |       "idiom" : "ipad",
70 |       "size" : "40x40",
71 |       "scale" : "2x"
72 |     },
73 |     {
74 |       "idiom" : "ipad",
75 |       "size" : "76x76",
76 |       "scale" : "1x"
77 |     },
78 |     {
79 |       "idiom" : "ipad",
80 |       "size" : "76x76",
81 |       "scale" : "2x"
82 |     },
83 |     {
84 |       "idiom" : "ipad",
85 |       "size" : "83.5x83.5",
86 |       "scale" : "2x"
87 |     },
88 |     {
89 |       "idiom" : "ios-marketing",
90 |       "size" : "1024x1024",
91 |       "scale" : "1x"
92 |     }
93 |   ],
94 |   "info" : {
95 |     "version" : 1,
96 |     "author" : "xcode"
97 |   }
98 | }


--------------------------------------------------------------------------------
/DynamicHorizontalScrollingShelves/Base.lproj/LaunchScreen.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" systemVersion="17A277" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
 5 |         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
 6 |         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
 7 |     </dependencies>
 8 |     <scenes>
 9 |         <!--View Controller-->
10 |         <scene sceneID="EHf-IW-A2E">
11 |             <objects>
12 |                 <viewController id="01J-lp-oVM" sceneMemberID="viewController">
13 |                     <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
14 |                         <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
15 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
16 |                         <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
17 |                         <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
18 |                     </view>
19 |                 </viewController>
20 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
21 |             </objects>
22 |             <point key="canvasLocation" x="53" y="375"/>
23 |         </scene>
24 |     </scenes>
25 | </document>
26 | 


--------------------------------------------------------------------------------
/DynamicHorizontalScrollingShelves/Base.lproj/Main.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <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">
 3 |     <device id="retina4_7" orientation="portrait">
 4 |         <adaptation id="fullscreen"/>
 5 |     </device>
 6 |     <dependencies>
 7 |         <deployment identifier="iOS"/>
 8 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13772"/>
 9 |         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
10 |         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
11 |     </dependencies>
12 |     <scenes>
13 |         <!--View Controller-->
14 |         <scene sceneID="tne-QT-ifu">
15 |             <objects>
16 |                 <viewController id="BYZ-38-t0r" customClass="ViewController" customModule="DynamicHorizontalScrollingShelves" customModuleProvider="target" sceneMemberID="viewController">
17 |                     <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
18 |                         <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
19 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
20 |                         <subviews>
21 |                             <segmentedControl opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="top" segmentControlStyle="plain" selectedSegmentIndex="0" translatesAutoresizingMaskIntoConstraints="NO" id="3nd-Me-eHi">
22 |                                 <rect key="frame" x="96" y="40" width="182" height="29"/>
23 |                                 <segments>
24 |                                     <segment title="First"/>
25 |                                     <segment title="Second"/>
26 |                                     <segment title="Third"/>
27 |                                 </segments>
28 |                                 <color key="tintColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
29 |                                 <connections>
30 |                                     <action selector="valueChanged:" destination="BYZ-38-t0r" eventType="valueChanged" id="xzS-CN-8S2"/>
31 |                                 </connections>
32 |                             </segmentedControl>
33 |                             <collectionView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" dataMode="prototypes" translatesAutoresizingMaskIntoConstraints="NO" id="uhH-WC-PDW">
34 |                                 <rect key="frame" x="0.0" y="88" width="375" height="200"/>
35 |                                 <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
36 |                                 <constraints>
37 |                                     <constraint firstAttribute="height" constant="200" id="PZJ-Qt-3wt"/>
38 |                                 </constraints>
39 |                                 <collectionViewFlowLayout key="collectionViewLayout" scrollDirection="horizontal" minimumLineSpacing="10" minimumInteritemSpacing="10" id="6Yj-4g-d5j">
40 |                                     <size key="itemSize" width="50" height="50"/>
41 |                                     <size key="headerReferenceSize" width="0.0" height="0.0"/>
42 |                                     <size key="footerReferenceSize" width="0.0" height="0.0"/>
43 |                                     <inset key="sectionInset" minX="0.0" minY="0.0" maxX="0.0" maxY="0.0"/>
44 |                                 </collectionViewFlowLayout>
45 |                                 <cells/>
46 |                                 <connections>
47 |                                     <outlet property="dataSource" destination="BYZ-38-t0r" id="bmO-nA-sFG"/>
48 |                                     <outlet property="delegate" destination="BYZ-38-t0r" id="8XP-Xe-H7D"/>
49 |                                 </connections>
50 |                             </collectionView>
51 |                         </subviews>
52 |                         <color key="backgroundColor" red="1" green="0.64779974490000003" blue="0.30532525510000003" alpha="1" colorSpace="calibratedRGB"/>
53 |                         <constraints>
54 |                             <constraint firstItem="uhH-WC-PDW" firstAttribute="top" secondItem="3nd-Me-eHi" secondAttribute="bottom" constant="20" id="IIG-KB-flH"/>
55 |                             <constraint firstItem="3nd-Me-eHi" firstAttribute="centerX" secondItem="6Tk-OE-BBY" secondAttribute="centerX" id="KHE-Li-7FY"/>
56 |                             <constraint firstItem="6Tk-OE-BBY" firstAttribute="trailing" secondItem="uhH-WC-PDW" secondAttribute="trailing" id="RWw-LT-eBG"/>
57 |                             <constraint firstItem="3nd-Me-eHi" firstAttribute="top" secondItem="6Tk-OE-BBY" secondAttribute="top" constant="20" id="Tm5-zT-x3c"/>
58 |                             <constraint firstItem="uhH-WC-PDW" firstAttribute="leading" secondItem="6Tk-OE-BBY" secondAttribute="leading" id="rpT-1l-aIY"/>
59 |                         </constraints>
60 |                         <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
61 |                     </view>
62 |                     <connections>
63 |                         <outlet property="collectionView" destination="uhH-WC-PDW" id="ILa-Si-oCb"/>
64 |                         <outlet property="collectionViewHeightConstraint" destination="PZJ-Qt-3wt" id="Fvf-9j-pqp"/>
65 |                         <outlet property="flowLayout" destination="6Yj-4g-d5j" id="NGq-HY-lus"/>
66 |                     </connections>
67 |                 </viewController>
68 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
69 |             </objects>
70 |         </scene>
71 |     </scenes>
72 | </document>
73 | 


--------------------------------------------------------------------------------
/DynamicHorizontalScrollingShelves/Constants.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  Constants.swift
 3 | //  DynamicHorizontalScrollingShelves
 4 | //
 5 | //  Created by Charles Chandler on 2/19/18.
 6 | //  Copyright © 2018 Charles Chandler. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | struct Constants {
12 |     
13 |     static let exampleCellReuseIdentifier: String = "ExampleCell"
14 |     static let cardWidth: CGFloat = 176.0
15 |     static let maximumCardHeight: CGFloat = 272.0
16 |     
17 | }
18 | 


--------------------------------------------------------------------------------
/DynamicHorizontalScrollingShelves/DynamicHeightCalculable.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  DynamicHeightCalculable.swift
 3 | //  DynamicHorizontalScrollingShelves
 4 | //
 5 | //  Created by Charles Chandler on 2/19/18.
 6 | //  Copyright © 2018 Charles Chandler. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | protocol DynamicHeightCalculable {
12 |     func height(forWidth: CGFloat) -> CGFloat
13 | }
14 | 
15 | func calculateHeighest<T: DynamicHeightCalculable>(with viewModels: [T], forWidth width: CGFloat) -> T? {
16 |     var largestViewModel = viewModels.first
17 |     var largestHeight: CGFloat = 0
18 |     
19 |     for viewModel in viewModels {
20 |         let height = viewModel.height(forWidth: width)
21 |         
22 |         if height > largestHeight {
23 |             largestHeight =  height
24 |             largestViewModel = viewModel
25 |         }
26 |     }
27 |     
28 |     return largestViewModel
29 | }
30 | 


--------------------------------------------------------------------------------
/DynamicHorizontalScrollingShelves/ExampleCell.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  ExampleCell.swift
 3 | //  DynamicHorizontalScrollingShelves
 4 | //
 5 | //  Created by Charles Chandler on 2/19/18.
 6 | //  Copyright © 2018 Charles Chandler. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | final class ExampleCell: UICollectionViewCell {
12 |     
13 |     @IBOutlet var title: UILabel!
14 |     @IBOutlet var body: UILabel!
15 |     
16 |     private static let sizingCell = UINib(nibName: Constants.exampleCellReuseIdentifier, bundle: nil).instantiate(withOwner: nil, options: nil).first! as! ExampleCell
17 |     
18 |     public func configure(with viewModel: ExampleViewModel, isSizing: Bool = false) {
19 |         body.text = viewModel.body
20 |         
21 |         guard !isSizing else {
22 |             return
23 |         }
24 |         
25 |         title.text = viewModel.title
26 |         
27 |         layer.cornerRadius = 2.0
28 |     }
29 |     
30 |     public static func height(for viewModel: ExampleViewModel, forWidth width: CGFloat) -> CGFloat {
31 |         sizingCell.prepareForReuse()
32 |         sizingCell.configure(with: viewModel, isSizing: true)
33 |         sizingCell.layoutIfNeeded()
34 |         var fittingSize = UILayoutFittingCompressedSize
35 |         fittingSize.width = width
36 |         let size = sizingCell.contentView.systemLayoutSizeFitting(fittingSize,
37 |                                                                   withHorizontalFittingPriority: .required,
38 |                                                                   verticalFittingPriority: .defaultLow)
39 |         
40 |         guard size.height < Constants.maximumCardHeight else {
41 |             return Constants.maximumCardHeight
42 |         }
43 |         
44 |         return size.height
45 |     }
46 |     
47 | }
48 | 


--------------------------------------------------------------------------------
/DynamicHorizontalScrollingShelves/ExampleCell.xib:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="13771" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
 3 |     <device id="retina4_7" orientation="portrait">
 4 |         <adaptation id="fullscreen"/>
 5 |     </device>
 6 |     <dependencies>
 7 |         <deployment identifier="iOS"/>
 8 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13772"/>
 9 |         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
10 |         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
11 |     </dependencies>
12 |     <objects>
13 |         <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
14 |         <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
15 |         <collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" id="Vhw-eY-ZzG" customClass="ExampleCell" customModule="DynamicHorizontalScrollingShelves" customModuleProvider="target">
16 |             <rect key="frame" x="0.0" y="0.0" width="210" height="227"/>
17 |             <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
18 |             <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" insetsLayoutMarginsFromSafeArea="NO">
19 |                 <rect key="frame" x="0.0" y="0.0" width="210" height="227"/>
20 |                 <autoresizingMask key="autoresizingMask"/>
21 |                 <subviews>
22 |                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="i2N-tY-7ey">
23 |                         <rect key="frame" x="16" y="16" width="178" height="21"/>
24 |                         <fontDescription key="fontDescription" type="system" pointSize="17"/>
25 |                         <nil key="textColor"/>
26 |                         <nil key="highlightedColor"/>
27 |                     </label>
28 |                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" textAlignment="natural" lineBreakMode="tailTruncation" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="AmL-tw-oMN">
29 |                         <rect key="frame" x="16" y="53" width="178" height="17"/>
30 |                         <fontDescription key="fontDescription" type="system" pointSize="14"/>
31 |                         <nil key="textColor"/>
32 |                         <nil key="highlightedColor"/>
33 |                     </label>
34 |                 </subviews>
35 |             </view>
36 |             <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
37 |             <constraints>
38 |                 <constraint firstAttribute="bottom" relation="greaterThanOrEqual" secondItem="AmL-tw-oMN" secondAttribute="bottom" constant="16" id="5o5-tW-Ppj"/>
39 |                 <constraint firstItem="i2N-tY-7ey" firstAttribute="top" secondItem="Vhw-eY-ZzG" secondAttribute="top" constant="16" id="Axq-7p-aPR"/>
40 |                 <constraint firstAttribute="trailing" secondItem="i2N-tY-7ey" secondAttribute="trailing" constant="16" id="IpJ-AV-yPY"/>
41 |                 <constraint firstItem="AmL-tw-oMN" firstAttribute="leading" secondItem="Vhw-eY-ZzG" secondAttribute="leading" constant="16" id="NCz-kz-KzR"/>
42 |                 <constraint firstAttribute="trailing" secondItem="AmL-tw-oMN" secondAttribute="trailing" constant="16" id="iSj-Z1-ASp"/>
43 |                 <constraint firstItem="AmL-tw-oMN" firstAttribute="top" secondItem="i2N-tY-7ey" secondAttribute="bottom" constant="16" id="nFi-lO-PGJ"/>
44 |                 <constraint firstItem="i2N-tY-7ey" firstAttribute="leading" secondItem="Vhw-eY-ZzG" secondAttribute="leading" constant="16" id="oby-aS-P2C"/>
45 |             </constraints>
46 |             <viewLayoutGuide key="safeArea" id="Vfh-GQ-QbB"/>
47 |             <size key="customSize" width="210" height="227"/>
48 |             <connections>
49 |                 <outlet property="body" destination="AmL-tw-oMN" id="L85-Ql-P6d"/>
50 |                 <outlet property="title" destination="i2N-tY-7ey" id="0m8-Zi-Wgn"/>
51 |             </connections>
52 |             <point key="canvasLocation" x="-120" y="-206.5"/>
53 |         </collectionViewCell>
54 |     </objects>
55 | </document>
56 | 


--------------------------------------------------------------------------------
/DynamicHorizontalScrollingShelves/ExampleData.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  ExampleData.swift
 3 | //  DynamicHorizontalScrollingShelves
 4 | //
 5 | //  Created by Charles Chandler on 2/19/18.
 6 | //  Copyright © 2018 Charles Chandler. All rights reserved.
 7 | //
 8 | 
 9 | import Foundation
10 | 
11 | struct ExampleData {
12 |     
13 |     static let dataSet1 = [
14 |         ExampleModel(title: "Lorem ipsum", body: "dolor sit amet, consectetur adipiscing elit,"),
15 |         ExampleModel(title: "sed do eiusmod", body: "tempor incididunt"),
16 |         ExampleModel(title: "Duis aute", body: "irure dolor in reprehenderit "),
17 |         ExampleModel(title: "in voluptate", body: nil),
18 |         ExampleModel(title: "velit esse cillum dolore eu fugiat nulla pariatur.", body: "Excepteur sint"),
19 |         ExampleModel(title: "occaecat cupidatat", body: "non proident,")
20 |     ]
21 |     
22 |     static let dataSet2 = [
23 |         ExampleModel(title: "Lorem ipsum", body: "dolor sit amet, consectetur adipiscing elit,"),
24 |         ExampleModel(title: "sed do eiusmod", body: "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."),
25 |         ExampleModel(title: "Duis aute", body: "irure dolor in reprehenderit "),
26 |         ExampleModel(title: "in voluptate", body: nil),
27 |         ExampleModel(title: "velit esse cillum dolore eu fugiat nulla pariatur.", body: "Excepteur sint"),
28 |         ExampleModel(title: "occaecat cupidatat", body: "non proident,")
29 |     ]
30 |     
31 |     static let dataSet3 = [
32 |         ExampleModel(title: "Lorem ipsum", body: nil),
33 |         ExampleModel(title: "sed do eiusmod", body: nil),
34 |         ExampleModel(title: "Duis aute", body: nil),
35 |         ExampleModel(title: "in voluptate", body: nil),
36 |         ExampleModel(title: "velit esse cillum dolore eu fugiat nulla pariatur.", body: nil),
37 |         ExampleModel(title: "occaecat cupidatat", body: nil)
38 |     ]
39 |     
40 | }
41 | 


--------------------------------------------------------------------------------
/DynamicHorizontalScrollingShelves/ExampleModel.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  Example.swift
 3 | //  DynamicHorizontalScrollingShelves
 4 | //
 5 | //  Created by Charles Chandler on 2/19/18.
 6 | //  Copyright © 2018 Charles Chandler. All rights reserved.
 7 | //
 8 | 
 9 | import Foundation
10 | 
11 | struct ExampleModel {
12 |     
13 |     let title: String
14 |     let body: String?
15 |     
16 | }
17 | 


--------------------------------------------------------------------------------
/DynamicHorizontalScrollingShelves/ExampleViewModel.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  ExampleViewModel.swift
 3 | //  DynamicHorizontalScrollingShelves
 4 | //
 5 | //  Created by Charles Chandler on 2/19/18.
 6 | //  Copyright © 2018 Charles Chandler. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | struct ExampleViewModel: DynamicHeightCalculable {
12 |     
13 |     let title: String
14 |     let body: String?
15 |     
16 |     init(example: ExampleModel) {
17 |         title = example.title
18 |         body = example.body
19 |     }
20 |     
21 |     public func height(forWidth width: CGFloat) -> CGFloat {
22 |         let sizingLabel = UILabel()
23 |         sizingLabel.numberOfLines = 0
24 |         sizingLabel.font = UIFont.systemFont(ofSize: 14.0, weight: .regular)
25 |         sizingLabel.lineBreakMode = .byTruncatingTail
26 |         sizingLabel.text = body
27 |         
28 |         let maxSize = CGSize(width: width, height: .greatestFiniteMagnitude)
29 |         let size = sizingLabel.sizeThatFits(maxSize)
30 |         
31 |         return size.height
32 |     }
33 |     
34 | }
35 | 


--------------------------------------------------------------------------------
/DynamicHorizontalScrollingShelves/Info.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
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 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>CFBundleDevelopmentRegion</key>
 6 | 	<string>$(DEVELOPMENT_LANGUAGE)</string>
 7 | 	<key>CFBundleExecutable</key>
 8 | 	<string>$(EXECUTABLE_NAME)</string>
 9 | 	<key>CFBundleIdentifier</key>
10 | 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
11 | 	<key>CFBundleInfoDictionaryVersion</key>
12 | 	<string>6.0</string>
13 | 	<key>CFBundleName</key>
14 | 	<string>$(PRODUCT_NAME)</string>
15 | 	<key>CFBundlePackageType</key>
16 | 	<string>APPL</string>
17 | 	<key>CFBundleShortVersionString</key>
18 | 	<string>1.0</string>
19 | 	<key>CFBundleVersion</key>
20 | 	<string>1</string>
21 | 	<key>LSRequiresIPhoneOS</key>
22 | 	<true/>
23 | 	<key>UILaunchStoryboardName</key>
24 | 	<string>LaunchScreen</string>
25 | 	<key>UIMainStoryboardFile</key>
26 | 	<string>Main</string>
27 | 	<key>UIRequiredDeviceCapabilities</key>
28 | 	<array>
29 | 		<string>armv7</string>
30 | 	</array>
31 | 	<key>UISupportedInterfaceOrientations</key>
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33 | 		<string>UIInterfaceOrientationPortrait</string>
34 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
35 | 		<string>UIInterfaceOrientationLandscapeRight</string>
36 | 	</array>
37 | 	<key>UISupportedInterfaceOrientations~ipad</key>
38 | 	<array>
39 | 		<string>UIInterfaceOrientationPortrait</string>
40 | 		<string>UIInterfaceOrientationPortraitUpsideDown</string>
41 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
42 | 		<string>UIInterfaceOrientationLandscapeRight</string>
43 | 	</array>
44 | </dict>
45 | </plist>
46 | 


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/DynamicHorizontalScrollingShelves/ViewController.swift:
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 1 | //
 2 | //  ViewController.swift
 3 | //  DynamicHorizontalScrollingShelves
 4 | //
 5 | //  Created by Charles Chandler on 2/19/18.
 6 | //  Copyright © 2018 Charles Chandler. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | class ViewController: UIViewController, UICollectionViewDataSource {
12 |     
13 |     @IBOutlet var collectionView: UICollectionView!
14 |     @IBOutlet var flowLayout: UICollectionViewFlowLayout!
15 |     @IBOutlet var collectionViewHeightConstraint: NSLayoutConstraint!
16 |     
17 |     private var data: [ExampleModel] = ExampleData.dataSet1
18 |     
19 |     private enum Segment: Int {
20 |         case dataSet1 = 0, dataSet2, dataSet3
21 |     }
22 |     
23 |     override func viewDidLoad() {
24 |         super.viewDidLoad()
25 |         
26 |         setupCollectioView()
27 |     }
28 |     
29 |     private func setupCollectioView() {
30 |         let nib = UINib(nibName: Constants.exampleCellReuseIdentifier, bundle: nil)
31 |         collectionView.register(nib, forCellWithReuseIdentifier: Constants.exampleCellReuseIdentifier)
32 |         
33 |         let edgeInsets = UIEdgeInsets(top: 8.0, left: 8.0, bottom: 8.0, right: 8.0)
34 |         flowLayout.sectionInset = edgeInsets
35 |         
36 |         setCollectionViewHeight(with: data, edgeInsets: flowLayout.sectionInset)
37 |     }
38 |     
39 |     private func setCollectionViewHeight(with data: [ExampleModel], edgeInsets: UIEdgeInsets) {
40 |         let viewModels = data.flatMap { ExampleViewModel(example: $0) }
41 |         
42 |         guard let viewModel = calculateHeighest(with: viewModels, forWidth: Constants.cardWidth) else {
43 |             return
44 |         }
45 |         
46 |         let height = ExampleCell.height(for: viewModel, forWidth: Constants.cardWidth)
47 |         
48 |         flowLayout.itemSize = CGSize(width: Constants.cardWidth, height: height)
49 |         
50 |         collectionViewHeightConstraint.constant = height + edgeInsets.top + edgeInsets.bottom
51 |     }
52 |     
53 |     // MARK: - UICollectionViewDatasource
54 |     
55 |     func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
56 |         return data.count
57 |     }
58 |     
59 |     func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
60 |         let cell = collectionView.dequeueReusableCell(withReuseIdentifier: Constants.exampleCellReuseIdentifier, for: indexPath) as! ExampleCell
61 |         let example = data[indexPath.item]
62 |         let viewModel = ExampleViewModel(example: example)
63 |         
64 |         cell.configure(with: viewModel)
65 |         
66 |         return cell
67 |     }
68 |     
69 |     // MARK: - Segmented Control
70 | 
71 |     @IBAction func valueChanged(_ sender: UISegmentedControl) {
72 |         guard let segment = Segment(rawValue: sender.selectedSegmentIndex) else {
73 |             fatalError("Invalid value returned from segmented control")
74 |         }
75 |         
76 |         switch segment {
77 |         case .dataSet1:
78 |             data = ExampleData.dataSet1
79 |         case .dataSet2:
80 |             data = ExampleData.dataSet2
81 |         case .dataSet3:
82 |             data = ExampleData.dataSet3
83 |         }
84 |         
85 |         setCollectionViewHeight(with: data, edgeInsets: flowLayout.sectionInset)
86 |         
87 |         flowLayout.invalidateLayout()
88 |         collectionView.reloadData()
89 |     }
90 |     
91 | }
92 | 
93 | 


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