The shuffle's intro from alexandra-afonasova

Made with ❤️ by Mac Gallagher

Features

💡 Advanced swipe recognition based on velocity and card position

💡 Manual and programmatic actions

💡 Smooth card overlay view transitions

💡 Fluid and customizable animations

💡 Dynamic card loading using data source pattern

Example

To run the example project, clone the repo and run the ShuffleExample target.

Basic Usage

Create your own card by either subclassing SwipeCard or setting its properties directly:

func card(fromImage image: UIImage) -> SwipeCard {
  let card = SwipeCard()
  card.swipeDirections = [.left, .right]
  card.content = UIImageView(image: image)
  
  let leftOverlay = UIView()
  leftOverlay.backgroundColor = .green
  
  let rightOverlay = UIView()
  rightOverlay.backgroundColor = .red
  
  card.setOverlays([.left: leftOverlay, .right: rightOverlay])
  
  return card
}

The card returned from card(fromImage:) displays an image, can be swiped left or right, and has overlay views for both directions.

Initialize your card data and place a SwipeCardStack on your view:

class ViewController: UIViewController {
  let cardStack = SwipeCardStack()
  
  let cardImages = [
      UIImage(named: "cardImage1"),
      UIImage(named: "cardImage2"),
      UIImage(named: "cardImage3")
  ]
  
  override func viewDidLoad() {
    super.viewDidLoad()
    view.addSubview(cardStack)
    cardStack.frame = view.safeAreaLayoutGuide.layoutFrame
  }
}

Conform your class to SwipeCardStackDataSource and set your card stack's dataSource:

func cardStack(_ cardStack: SwipeCardStack, cardForIndexAt index: Int) -> SwipeCard {
  return card(fromImage: cardImages[index])
}

func numberOfCards(in cardStack: SwipeCardStack) -> Int {
  return cardImages.count
}

cardStack.dataSource = self

Conform to SwipeCardStackDelegate to subscribe to any of the following events:

 func cardStack(_ cardStack: SwipeCardStack, didSelectCardAt index: Int)
 func cardStack(_ cardStack: SwipeCardStack, didSwipeCardAt index: Int, with direction: SwipeDirection)
 func cardStack(_ cardStack: SwipeCardStack, didUndoCardAt index: Int, from direction: SwipeDirection)
 func didSwipeAllCards(_ cardStack: SwipeCardStack)

Note: didSwipeCardAt and didSwipeAllCards are called regardless if a card is swiped programmatically or by the user.

Card Stack Actions

The following methods are available on SwipeCardStack.

Swipe

Performs a swipe programmatically in the given direction.

func swipe(_ direction: SwipeDirection, animated: Bool)

Shift

Shifts the card stack's cards by the given distance. Any swiped cards are skipped over.

func shift(withDistance distance: Int = 1, animated: Bool)

Undo

Returns the most recently swiped card to the top of the card stack.

func undoLastSwipe(animated: Bool)

Card Layout

Each SwipeCard consists of three UI components: its content, footer, and overlay(s).

Content

The content is the card's primary view. You can include your own card template here.

var content: UIView? { get set }

Footer

The footer is an axuilliary view on the bottom of the card. It is laid out above the content in the view hierarchy if the footer is transparent. Otherwise, the footer is drawn just below the content.

var footer: UIView? { get set }
var footerHeight: CGFloat { get set }

Overlays

An overlay is a view whose alpha value reacts to the user's dragging. The overlays are laid out above the footer, regardless if the footer is transparent or not.

func overlay(forDirection direction: SwipeDirection) -> UIView?
func setOverlay(_ overlay: UIView?, forDirection direction: SwipeDirection)
func setOverlays(_ overlays: [SwipeDirection: UIView])

Advanced Usage

For more advanced usage, including

visit the document here.

Installation

CocoaPods

Shuffle is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'Shuffle-iOS'

The import statement in this case will be

import Shuffle_iOS

Carthage

Shuffle is available through Carthage. To install it, simply add the following line to your Cartfile:

github "mac-gallagher/Shuffle"

Swift Package Manager

Shuffle is available through Swift PM. To install it, simply add the package as a dependency in Package.swift:

dependencies: [
  .package(url: "https://github.com/mac-gallagher/Shuffle.git", from: "0.1.0"),
]

Manual

Download and drop the Sources directory into your project.

Requirements

iOS 9.0+
Xcode 10.2+
Swift 5.0+

Apps Using Shuffle

We love to hear about apps that use Shuffle - feel free to submit a pull request and share yours here!