├── CarLensCollectionViewLayoutDemo
├── Supporting files
│ ├── Assets.xcassets
│ │ ├── Contents.json
│ │ └── AppIcon.appiconset
│ │ │ └── Contents.json
│ ├── Info.plist
│ └── Base.lproj
│ │ ├── LaunchScreen.storyboard
│ │ └── Main.storyboard
├── AppDelegate.swift
├── CollectionViewCell.swift
└── CollectionViewController.swift
├── CarLensCollectionViewLayout.xcodeproj
├── project.xcworkspace
│ └── xcshareddata
│ │ └── IDEWorkspaceChecks.plist
├── xcshareddata
│ └── xcschemes
│ │ ├── CarLensCollectionViewLayout.xcscheme
│ │ └── CarLensCollectionViewLayoutDemo.xcscheme
└── project.pbxproj
├── .gitignore
├── CarLensCollectionViewLayout
├── CarLensCollectionViewLayout.h
├── Info.plist
├── CarLensLayoutAttributes.swift
├── CarLensCollectionViewLayoutOptions.swift
├── CarLensCollectionViewCell.swift
└── CarLensCollectionViewLayout.swift
├── CarLensCollectionViewLayout.podspec
├── LICENSE.md
├── bitrise.yml
└── README.md
/CarLensCollectionViewLayoutDemo/Supporting files/Assets.xcassets/Contents.json:
--------------------------------------------------------------------------------
1 | {
2 | "info" : {
3 | "version" : 1,
4 | "author" : "xcode"
5 | }
6 | }
--------------------------------------------------------------------------------
/CarLensCollectionViewLayout.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist:
--------------------------------------------------------------------------------
1 |
2 |
3 |
4 |
5 | IDEDidComputeMac32BitWarning
6 |
7 |
8 |
9 |
--------------------------------------------------------------------------------
/CarLensCollectionViewLayoutDemo/AppDelegate.swift:
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1 | //
2 | // AppDelegate.swift
3 | // CarLensCollectionViewDemo
4 | //
5 | // Copyright © 2019 Netguru. All rights reserved.
6 | //
7 |
8 | import UIKit
9 |
10 | @UIApplicationMain
11 | class AppDelegate: UIResponder, UIApplicationDelegate {
12 |
13 | var window: UIWindow?
14 |
15 | func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
16 | return true
17 | }
18 | }
19 |
--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
1 | .DS_Store
2 | .Trashes
3 | .localized
4 |
5 | build
6 | .build
7 | xcuserdata
8 | DerivedData
9 |
10 | *.mode1v3
11 | *.mode2v3
12 | *.perspectivev3
13 | *.pbxuser
14 | *.xccheckout
15 | *.xcuserstate
16 | *.xcscmblueprint
17 | *.moved-aside
18 | *.hmap
19 | *.o
20 | *.hmap
21 | *.ipa
22 | *.dSYM.zip
23 |
24 | timeline.xctimeline
25 | playground.xcworkspace
26 |
27 | .idea
28 | *.iml
29 |
30 | Pods
31 | Carthage
32 | Packages
33 |
34 | fastlane/report.xml
35 | fastlane/Preview.html
36 | fastlane/screenshots
37 | fastlane/test_output
38 |
39 | .env
40 |
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/CarLensCollectionViewLayout/CarLensCollectionViewLayout.h:
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1 | //
2 | // CarLensCollectionViewLayout.h
3 | // CarLensCollectionViewLayout
4 | //
5 | // Copyright © 2018 Netguru. All rights reserved.
6 | //
7 |
8 | #import
9 |
10 | //! Project version number for CarLensCollectionViewLayout.
11 | FOUNDATION_EXPORT double CarLensCollectionViewLayoutVersionNumber;
12 |
13 | //! Project version string for CarLensCollectionViewLayout.
14 | FOUNDATION_EXPORT const unsigned char CarLensCollectionViewLayoutVersionString[];
15 |
16 | // In this header, you should import all the public headers of your framework using statements like #import
17 |
18 |
19 |
--------------------------------------------------------------------------------
/CarLensCollectionViewLayout.podspec:
--------------------------------------------------------------------------------
1 | Pod::Spec.new do |s|
2 |
3 | s.name = "CarLensCollectionViewLayout"
4 | s.version = "1.2.0"
5 | s.summary = "An easy to use Collection View Layout for card-like animation."
6 |
7 | s.homepage = "https://github.com/netguru/CarLensCollectionViewLayout"
8 | s.license = { :type => "MIT", :file => "LICENSE.md" }
9 | s.authors = { "Anna-Mariia Shkarlinska" => "anna-mariia.shkarlinska@netguru.co",
10 | "Michał Kwiecień" => "michal.kwiecien@netguru.co" }
11 |
12 | s.platform = :ios, "9.0"
13 | s.source = { :git => "https://github.com/netguru/CarLensCollectionViewLayout.git", :tag => "#{s.version}" }
14 | s.source_files = "CarLensCollectionViewLayout/**/*.swift"
15 | s.swift_version = "4.2"
16 | s.framework = "UIKit"
17 |
18 | end
--------------------------------------------------------------------------------
/CarLensCollectionViewLayout/Info.plist:
--------------------------------------------------------------------------------
1 |
2 |
3 |
4 |
5 | CFBundleDevelopmentRegion
6 | $(DEVELOPMENT_LANGUAGE)
7 | CFBundleExecutable
8 | $(EXECUTABLE_NAME)
9 | CFBundleIdentifier
10 | $(PRODUCT_BUNDLE_IDENTIFIER)
11 | CFBundleInfoDictionaryVersion
12 | 6.0
13 | CFBundleName
14 | $(PRODUCT_NAME)
15 | CFBundlePackageType
16 | FMWK
17 | CFBundleShortVersionString
18 | 1.2.0
19 | CFBundleVersion
20 | $(CURRENT_PROJECT_VERSION)
21 |
22 |
23 |
--------------------------------------------------------------------------------
/CarLensCollectionViewLayout/CarLensLayoutAttributes.swift:
--------------------------------------------------------------------------------
1 | //
2 | // CarLensLayoutAttributes.swift
3 | // CarLensLayoutAttributes
4 | //
5 | // Copyright © 2018 Netguru. All rights reserved.
6 | //
7 |
8 |
9 | import UIKit
10 |
11 | final class CarLensLayoutAttributes: UICollectionViewLayoutAttributes {
12 |
13 | /// Progress towards the center of the screen, value between 0 and 1.
14 | var progress = 0.0
15 |
16 | /// SeeAlso: UICollectionViewLayoutAttributes
17 | override func copy(with zone: NSZone?) -> Any {
18 | let attributes = super.copy(with: zone)
19 | (attributes as? CarLensLayoutAttributes)?.progress = progress
20 | return attributes
21 | }
22 |
23 | /// SeeAlso: UICollectionViewLayoutAttributes
24 | override func isEqual(_ object: Any?) -> Bool {
25 | guard let attributes = object as? CarLensLayoutAttributes,
26 | attributes.progress == progress else { return false }
27 | return super.isEqual(object)
28 | }
29 | }
30 |
--------------------------------------------------------------------------------
/LICENSE.md:
--------------------------------------------------------------------------------
1 | MIT License
2 |
3 | Copyright (c) 2019 Netguru S.A.
4 |
5 | Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
6 |
7 | The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
8 |
9 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
10 |
--------------------------------------------------------------------------------
/CarLensCollectionViewLayoutDemo/CollectionViewCell.swift:
--------------------------------------------------------------------------------
1 | //
2 | // CollectionViewCell.swift
3 | // CarLensCollectionViewDemo
4 | //
5 | // Copyright © 2019 Netguru. All rights reserved.
6 | //
7 |
8 | import UIKit
9 | import CarLensCollectionViewLayout
10 |
11 | class CollectionViewCell: CarLensCollectionViewCell {
12 |
13 | static let identifier = "CollectionViewCell"
14 |
15 | private var upperView: UILabel = {
16 | var label = UILabel()
17 | label.translatesAutoresizingMaskIntoConstraints = false
18 | label.font = .boldSystemFont(ofSize: 60)
19 | label.textAlignment = .center
20 | label.textColor = .white
21 | label.text = "CarLens"
22 | return label
23 | }()
24 |
25 | private var bottomView: UIView = {
26 | var view = UIView()
27 | view.translatesAutoresizingMaskIntoConstraints = false
28 | view.backgroundColor = .white
29 | view.layer.cornerRadius = 10
30 | return view
31 | }()
32 |
33 | override init(frame: CGRect) {
34 | super.init(frame: frame)
35 | configure(topView: upperView, cardView: bottomView)
36 | }
37 |
38 | required init?(coder aDecoder: NSCoder) {
39 | fatalError("init(coder:) has not been implemented")
40 | }
41 | }
42 |
--------------------------------------------------------------------------------
/CarLensCollectionViewLayoutDemo/CollectionViewController.swift:
--------------------------------------------------------------------------------
1 | //
2 | // CollectionViewController.swift
3 | // CarLensCollectionViewDemo
4 | //
5 | // Copyright © 2019 Netguru. All rights reserved.
6 | //
7 |
8 | import UIKit
9 | import CarLensCollectionViewLayout
10 |
11 | class CollectionViewController: UICollectionViewController {
12 |
13 | override func viewDidLoad() {
14 | super.viewDidLoad()
15 | setupView()
16 | }
17 |
18 | private func setupView() {
19 | collectionView.backgroundColor = .lightGray
20 | collectionView.register(CollectionViewCell.self, forCellWithReuseIdentifier: CollectionViewCell.identifier)
21 | collectionView.showsHorizontalScrollIndicator = false
22 | collectionView.collectionViewLayout = CarLensCollectionViewLayout()
23 | }
24 |
25 | override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
26 | return 5
27 | }
28 |
29 | override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
30 | guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: CollectionViewCell.identifier, for: indexPath) as? CollectionViewCell else {
31 | return UICollectionViewCell()
32 | }
33 | return cell
34 | }
35 |
36 | }
37 |
--------------------------------------------------------------------------------
/CarLensCollectionViewLayoutDemo/Supporting files/Info.plist:
--------------------------------------------------------------------------------
1 |
2 |
3 |
4 |
5 | CFBundleDevelopmentRegion
6 | $(DEVELOPMENT_LANGUAGE)
7 | CFBundleExecutable
8 | $(EXECUTABLE_NAME)
9 | CFBundleIdentifier
10 | $(PRODUCT_BUNDLE_IDENTIFIER)
11 | CFBundleInfoDictionaryVersion
12 | 6.0
13 | CFBundleName
14 | $(PRODUCT_NAME)
15 | CFBundlePackageType
16 | APPL
17 | CFBundleShortVersionString
18 | 1.0
19 | CFBundleVersion
20 | 1
21 | LSRequiresIPhoneOS
22 |
23 | UILaunchStoryboardName
24 | LaunchScreen
25 | UIMainStoryboardFile
26 | Main
27 | UIRequiredDeviceCapabilities
28 |
29 | armv7
30 |
31 | UISupportedInterfaceOrientations
32 |
33 | UIInterfaceOrientationPortrait
34 |
35 | UISupportedInterfaceOrientations~ipad
36 |
37 | UIInterfaceOrientationPortrait
38 | UIInterfaceOrientationPortraitUpsideDown
39 | UIInterfaceOrientationLandscapeLeft
40 | UIInterfaceOrientationLandscapeRight
41 |
42 |
43 |
44 |
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/CarLensCollectionViewLayoutDemo/Supporting files/Base.lproj/LaunchScreen.storyboard:
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1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
24 |
25 |
26 |
--------------------------------------------------------------------------------
/bitrise.yml:
--------------------------------------------------------------------------------
1 | #
2 | # bitrise.yml
3 | #
4 | # Copyright © 2017 Netguru Sp. z o.o. All rights reserved.
5 | #
6 |
7 | # CLI metadata
8 |
9 | format_version: 1.3.1
10 | default_step_lib_source: https://github.com/bitrise-io/bitrise-steplib.git
11 |
12 | # Workflow trigger map
13 |
14 | trigger_map:
15 |
16 | - pull_request_target_branch: develop
17 | workflow: build
18 |
19 | - push_branch: develop
20 | workflow: build
21 |
22 | # Environment configuration
23 |
24 | app:
25 | envs:
26 | - XCODEBUILD_PROJECT: ./CarLensCollectionViewLayout.xcodeproj
27 |
28 | # Workflow declarations
29 |
30 | workflows:
31 |
32 | # Top level build workflows
33 |
34 | build:
35 | envs:
36 | - XCODEBUILD_SCHEME: CarLensCollectionViewLayout
37 | - XCODEBUILD_SCHEME_DEMO: CarLensCollectionViewLayoutDemo
38 | before_run:
39 | - build-lib
40 | - build-demo
41 | - cocoapods-test
42 | after_run:
43 | - deploy-artifacts
44 |
45 | build-lib:
46 | steps:
47 | - script:
48 | title: build-lib
49 | inputs:
50 | - content: xcodebuild -project $XCODEBUILD_PROJECT -scheme $XCODEBUILD_SCHEME -destination 'platform=iOS Simulator,name=iPhone 7 Plus'
51 |
52 | build-demo:
53 | steps:
54 | - script:
55 | title: build-demo
56 | inputs:
57 | - content: xcodebuild -project $XCODEBUILD_PROJECT -scheme $XCODEBUILD_SCHEME_DEMO -destination 'platform=iOS Simulator,name=iPhone 7 Plus'
58 |
59 | cocoapods-test:
60 | steps:
61 | - script:
62 | title: cocoapods-lint
63 | inputs:
64 | # -- allow-warnings should be removed once repository is public
65 | - content: pod lib lint --allow-warnings
66 |
67 | # Deploy workflows
68 |
69 | deploy-artifacts:
70 | steps:
71 | - deploy-to-bitrise-io:
72 | inputs:
73 | - notify_user_groups: none
74 | - is_enable_public_page: false
75 |
--------------------------------------------------------------------------------
/CarLensCollectionViewLayout/CarLensCollectionViewLayoutOptions.swift:
--------------------------------------------------------------------------------
1 | //
2 | // CarLensCollectionViewLayoutOptions.swift
3 | // CarLensCollectionViewLayout
4 | //
5 | // Copyright © 2019 Netguru. All rights reserved.
6 | //
7 |
8 | import UIKit
9 |
10 | /// The optional configuration of CarLensCollectionViewLayout. Use this if you need to customize `CarLensCollectionViewLayout`.
11 | public struct CarLensCollectionViewLayoutOptions {
12 |
13 | /// A minimum spacing between cells.
14 | let minimumSpacing: CGFloat
15 |
16 | /// A deceleration for a scroll view.
17 | let decelerationRate: UIScrollView.DecelerationRate
18 |
19 | /// A value indicating whether collection view should have a scroll indicator.
20 | let shouldShowScrollIndicator: Bool
21 |
22 | /// The size to use for cells.
23 | let itemSize: CGSize?
24 |
25 | /// The initialization of the optional layout configuration.
26 | /// You can initialize it with any of the parameters available. Others will be configured automatically.
27 | ///
28 | /// - Parameters:
29 | /// - minimumSpacing: A minimum spacing between cells. The default value is `20`.
30 | /// - decelerationRate: A deceleration for a scroll view. The default value is `.fast`.
31 | /// - shouldShowScrollIndicator: A value indicating whether collection view should have a scroll indicator. The default value is `false`.
32 | /// - itemSize: The size to use for cells. The default height is equal to a collection view height. The width is equal to the `collection view width - 60`.
33 | public init(minimumSpacing: CGFloat = 20, decelerationRate: UIScrollView.DecelerationRate = UIScrollView.DecelerationRate.fast, shouldShowScrollIndicator: Bool = false, itemSize: CGSize? = nil) {
34 | self.minimumSpacing = minimumSpacing
35 | self.decelerationRate = decelerationRate
36 | self.shouldShowScrollIndicator = shouldShowScrollIndicator
37 | self.itemSize = itemSize
38 | }
39 |
40 | }
41 |
--------------------------------------------------------------------------------
/CarLensCollectionViewLayoutDemo/Supporting files/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 | }
--------------------------------------------------------------------------------
/CarLensCollectionViewLayout/CarLensCollectionViewCell.swift:
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1 | //
2 | // CarLensCollectionViewCell.swift
3 | // CarLensCollectionViewCell
4 | //
5 | // Copyright © 2018 Netguru. All rights reserved.
6 | //
7 |
8 |
9 | import UIKit.UICollectionView
10 |
11 | open class CarLensCollectionViewCell: UICollectionViewCell {
12 |
13 | /// Indicates if the cell is currently displayed as primary cell.
14 | public var isCurrentlyPrimary = false
15 |
16 | /// The upper view of the cell.
17 | public var topView: UIView!
18 |
19 | /// The bottom view of the cell.
20 | public var cardView: UIView!
21 |
22 | /// The height of the top view.
23 | public var topViewHeight: CGFloat!
24 |
25 | /// Configuration of the cell. Must be called on a start.
26 | ///
27 | /// - Parameters:
28 | /// - topView: The upper view of the cell.
29 | /// - cardView: The bottom view of the cell.
30 | /// - topViewHeight: An optional parameter to specify the custom height of the top view. The default value is `200` depending on a device's size.
31 | open func configure(topView: UIView, cardView: UIView, topViewHeight: CGFloat = 200) {
32 | self.topViewHeight = topViewHeight
33 | self.topView = topView
34 | self.cardView = cardView
35 | setupView()
36 | }
37 |
38 | private func animateViews(toProgress progress: Double) {
39 | let offset = topViewHeight - (CGFloat(progress) * topViewHeight)
40 | cardView.transform = .init(translationX: 0, y: -offset)
41 | }
42 |
43 | private func setupView() {
44 | [topView, cardView].forEach(contentView.addSubview)
45 | NSLayoutConstraint.activate([
46 | topView.topAnchor.constraint(equalTo: topAnchor),
47 | topView.leadingAnchor.constraint(equalTo: leadingAnchor),
48 | topView.trailingAnchor.constraint(equalTo: trailingAnchor),
49 | topView.heightAnchor.constraint(equalToConstant: topViewHeight),
50 | cardView.bottomAnchor.constraint(equalTo: bottomAnchor),
51 | cardView.leadingAnchor.constraint(equalTo: leadingAnchor),
52 | cardView.trailingAnchor.constraint(equalTo: trailingAnchor),
53 | cardView.topAnchor.constraint(equalTo: topView.bottomAnchor)
54 | ])
55 | }
56 |
57 | /// - SeeAlso: UICollectionViewCell
58 | open override func apply(_ layoutAttributes: UICollectionViewLayoutAttributes) {
59 | super.apply(layoutAttributes)
60 | guard let attributes = layoutAttributes as? CarLensLayoutAttributes else { return }
61 | isCurrentlyPrimary = !(attributes.progress == 0)
62 | animateViews(toProgress: attributes.progress)
63 | }
64 | }
65 |
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/CarLensCollectionViewLayout/CarLensCollectionViewLayout.swift:
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1 | //
2 | // CarLensCollectionViewLayout.swift
3 | // CarLensCollectionViewLayout
4 | //
5 | // Copyright © 2018 Netguru. All rights reserved.
6 | //
7 |
8 | import UIKit
9 |
10 | public final class CarLensCollectionViewLayout: UICollectionViewFlowLayout {
11 |
12 | private var firstSetupDone = false
13 |
14 | private let options: CarLensCollectionViewLayoutOptions
15 |
16 | /// SeeAlso: UICollectionViewFlowLayout
17 | public override func prepare() {
18 | super.prepare()
19 | guard !firstSetupDone else { return }
20 | setup()
21 | firstSetupDone = true
22 | }
23 |
24 |
25 | /// The initialization of the CarLensCollectionViewLayout.
26 | ///
27 | /// - Parameters:
28 | /// - options: An optional additional configuration of the layout.
29 | public init(options: CarLensCollectionViewLayoutOptions = CarLensCollectionViewLayoutOptions()) {
30 | self.options = options
31 | super.init()
32 | }
33 |
34 | public required init?(coder aDecoder: NSCoder) {
35 | self.options = CarLensCollectionViewLayoutOptions()
36 | super.init(coder: aDecoder)
37 | }
38 |
39 | private func setup() {
40 | guard let collectionView = collectionView else { return }
41 | scrollDirection = .horizontal
42 | minimumLineSpacing = options.minimumSpacing
43 | itemSize = options.itemSize ?? CGSize(width: collectionView.bounds.width - 60, height: collectionView.bounds.height)
44 | let sidesInset = (collectionView.bounds.width - itemSize.width) / 2
45 | let topAndBottomInset = (collectionView.bounds.height - itemSize.height) / 2
46 | collectionView.contentInset = .init(top: topAndBottomInset, left: sidesInset, bottom: topAndBottomInset, right: sidesInset)
47 | collectionView.decelerationRate = options.decelerationRate
48 | collectionView.showsHorizontalScrollIndicator = options.shouldShowScrollIndicator
49 | }
50 |
51 | /// SeeAlso: UICollectionViewFlowLayout
52 | public override func shouldInvalidateLayout(forBoundsChange newBounds: CGRect) -> Bool {
53 | return true
54 | }
55 |
56 | /// SeeAlso: UICollectionViewFlowLayout
57 | public override class var layoutAttributesClass: AnyClass {
58 | return CarLensLayoutAttributes.self
59 | }
60 |
61 | /// SeeAlso: UICollectionViewFlowLayout
62 | public override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
63 | guard let collectionView = collectionView, let allAttributes = super.layoutAttributesForElements(in: rect) else { return nil }
64 | for attributes in allAttributes {
65 | let collectionCenter = collectionView.bounds.size.width / 2
66 | let offset = collectionView.contentOffset.x
67 | let normalizedCenter = attributes.center.x - offset
68 |
69 | let maxDistance = itemSize.width + minimumLineSpacing
70 | let distanceFromCenter = min(collectionCenter - normalizedCenter, maxDistance)
71 | let ratio = (maxDistance - abs(distanceFromCenter)) / maxDistance
72 | let normalizedRatio = min(1, max(0, ratio))
73 |
74 | guard let attributes = attributes as? CarLensLayoutAttributes else { continue }
75 | attributes.progress = Double(normalizedRatio)
76 | }
77 | return allAttributes
78 | }
79 |
80 | /// SeeAlso: UICollectionViewFlowLayout
81 | public override func targetContentOffset(forProposedContentOffset proposedContentOffset: CGPoint, withScrollingVelocity velocity: CGPoint) -> CGPoint {
82 | guard let collectionView = collectionView, let layoutAttributes = layoutAttributesForElements(in: collectionView.bounds) else {
83 | return .init(x: 0, y: 0)
84 | }
85 | // Snapping closest cell to the center
86 | let centerOffset = collectionView.bounds.size.width / 2
87 | let offsetWithCenter = proposedContentOffset.x + (proposedContentOffset.x * velocity.x) + centerOffset
88 | let closestAttribute = layoutAttributes
89 | .sorted { abs($0.center.x - offsetWithCenter) < abs($1.center.x - offsetWithCenter) }
90 | .first ?? UICollectionViewLayoutAttributes()
91 | return CGPoint(x: closestAttribute.center.x - centerOffset, y: 0)
92 | }
93 | }
94 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # CarLensCollectionViewLayout
2 |
3 | 
4 | 
5 | 
6 | 
7 |
8 | An easy-to-use Collection View Layout for card-like animation 🎉
9 |
10 |
11 | 
12 |
13 |
14 | *CarLensCollectionViewLayout* was created out of the implementation in [**CarLens** application 🚘](https://github.com/netguru/car-recognition-ios). The image above exactly shows the screen from the app!
15 |
16 | ## Requirements
17 |
18 | *CarLensCollectionViewLayout* is written in **Swift 4.2** and supports **iOS 9.0+**.
19 |
20 |
21 | ## Usage
22 |
23 | ### Basic Usage
24 |
25 | The two main steps are needed for the configuration of *CarLensCollectionViewLayout*:
26 |
27 | #### Step 1
28 | Assign `CarLensCollectionViewLayout` to yours collection view layout:
29 | ```swift
30 | collectionView.collectionViewLayout = CarLensCollectionViewLayout()
31 | ```
32 | or initialize your collection view with `CarLensCollectionViewLayout`:
33 | ```swift
34 | UICollectionView(frame: .zero, collectionViewLayout: CarLensCollectionViewLayout())
35 | ```
36 |
37 | #### Step 2
38 | Subsclass `CarLensCollectionViewCell` and call `configure(topView: UIView, cardView: UIView)` during the cell’s initialization:
39 | ```swift
40 | class CollectionViewCell: CarLensCollectionViewCell {
41 | override init(frame: CGRect) {
42 | super.init(frame: frame)
43 | configure(topView: upperView, cardView: bottomView)
44 | }
45 | }
46 | ```
47 | The sample implementation is available in [Demo](CarLensCollectionViewLayoutDemo) project.
48 |
49 | ### Customization
50 |
51 | #### Layout
52 | You can also initialize `CarLensCollectionViewLayout` with a `CarLensCollectionViewLayoutOptions` object by passing any of the parameters available. Others will be configured automatically.
53 |
54 | **Parameters:**
55 |
56 | `minimumSpacing` - A minimum spacing between cells.
57 |
58 | `decelerationRate` - A deceleration for a scroll view.
59 |
60 | `shouldShowScrollIndicator` - A value indicating whether collection view should have a scroll indicator.
61 |
62 | `itemSize` - The size to use for cells.
63 |
64 | Example:
65 | ```swift
66 | let options = CarLensCollectionViewLayoutOptions(minimumSpacing: 40)
67 | collectionView.collectionViewLayout = CarLensCollectionViewLayout(options: options)
68 | ```
69 |
70 | #### Cell
71 | While subsclassing `CarLensCollectionViewCell` you can call `configure(...)` with an additional parameter `topViewHeight`. The card view height will be calculated based on this value.
72 |
73 | Example:
74 | ```swift
75 | class CollectionViewCell: CarLensCollectionViewCell {
76 | override init(frame: CGRect) {
77 | super.init(frame: frame)
78 | configure(topView: upperView, cardView: bottomView, topViewHeight: 300)
79 | }
80 | }
81 | ```
82 |
83 | 
84 | 
85 |
86 |
87 | ## Installation
88 |
89 | ### CocoaPods
90 |
91 | If you're using [CocoaPods](http://cocoapods.org), add the following dependency to your `Podfile`:
92 |
93 | ```none
94 | use_frameworks!
95 | pod 'CarLensCollectionViewLayout', '~> 1.2.0'
96 | ```
97 |
98 | ### Carthage
99 |
100 | If you're using [Carthage](https://github.com/Carthage/Carthage), add the following dependency to your `Cartfile`:
101 |
102 | ```none
103 | github "netguru/CarLensCollectionViewLayout" ~> 1.2.0
104 | ```
105 |
106 | ## About
107 |
108 | This project is made with ❤️ by [Netguru](https://netguru.co) and maintained by [Anna-Mariia Shkarlinska](https://github.com/anyashka).
109 |
110 | ### License
111 |
112 | *CarLensCollectionViewLayout* is licensed under the MIT License. See [LICENSE.md](LICENSE.md) for more info.
113 |
114 | ## Read More
115 |
116 | - [Introducing CarLensCollectionViewLayout - a New Open Source iOS Tool by Netguru](https://www.netguru.com/codestories/introducing-carlenscollectionviewlayout-a-new-open-source-ios-tool-by-netguru)
117 | - [How We Built CarLens](https://www.netguru.com/blog/machine-learning-and-augmented-reality-combined-in-one-sleek-mobile-app-how-we-built-car-lens)
118 | - [Increasing the Accuracy of the Machine Learning Model in CarLens](https://www.netguru.com/blog/improving-machine-learning-model-carlens-case-study)
119 |
120 | ## Related Links
121 |
122 | - [CarLens Page](https://www.netguru.com/carlens)
123 | - [CarLens iOS](https://github.com/netguru/CarLens-iOS)
124 | - [CarLens in App Store](https://itunes.apple.com/us/app/carlens/id1417168518?mt=8)
125 | - [CarLens Android](https://github.com/netguru/CarLens-Android)
126 | - [CarLens on Google Play](https://play.google.com/store/apps/details?id=co.netguru.android.carrecognition&hl=en)
127 |
--------------------------------------------------------------------------------
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