github.com/jonivr/verticalcardswiper

VerticalCardSwiper

A marriage between the Shazam Discover UI and Tinder, built with UICollectionView in Swift.

Project goal and information

The goal of this project is to recreate the Discover UI in Shazam (which I think is a great, fun way to display content) in combination with a Tinder style of swiping cards to the left/right. The idea behind this is that in some cases, you don't want to swipe away cards, but keep them available for later on. This implementation allows for that. And it's a fun way to interact with content.

It's built with a UICollectionView and a custom flowLayout.

Requirements

• iOS 9.0+
• Swift 5

Installation

CocoaPods

To install with CocoaPods, simply add the following line to your Podfile:

pod 'VerticalCardSwiper'

Carthage

To install with Carthage, simply add the following line to your Podfile:

github "JoniVR/VerticalCardSwiper"

Example

To try out VerticalCardSwiper

pod try VerticalCardSwiper

or open the project and run the Example.

Usage

VerticalCardSwiper behaves a lot like a standard UICollectionView. To use it inside your UIViewController:

import VerticalCardSwiper

class ExampleViewController: UIViewController, VerticalCardSwiperDatasource {
    
    private var cardSwiper: VerticalCardSwiper!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        cardSwiper = VerticalCardSwiper(frame: self.view.bounds)
        view.addSubview(cardSwiper)
        
        cardSwiper.datasource = self
        
        // register cardcell for storyboard use
        cardSwiper.register(nib: UINib(nibName: "ExampleCell", bundle: nil), forCellWithReuseIdentifier: "ExampleCell")
    }
    
    func cardForItemAt(verticalCardSwiperView: VerticalCardSwiperView, cardForItemAt index: Int) -> CardCell {
        
        if let cardCell = verticalCardSwiperView.dequeueReusableCell(withReuseIdentifier: "ExampleCell", for: index) as? ExampleCardCell {
            return cardCell
        }
        return CardCell()
    }
    
    func numberOfCards(verticalCardSwiperView: VerticalCardSwiperView) -> Int {
        return 100
    }
}

Properties

/// Indicates if side swiping on cards is enabled. Set to false if you don't want side swiping. Default is `true`.
@IBInspectable public var isSideSwipingEnabled: Bool = true
/// Allows you to enable/disable the stacking effect. Default is `true` (enabled).
@IBInspectable public var isStackingEnabled: Bool = true
/// The transform animation that is shown on the top card when scrolling through the cards. Default is 0.05.
@IBInspectable public var firstItemTransform: CGFloat = 0.05
/// The inset (spacing) at the top for the cards. Default is 40.
@IBInspectable public var topInset: CGFloat = 40
/// The inset (spacing) at each side of the cards. Default is 20.
@IBInspectable public var sideInset: CGFloat = 20
/// Sets how much of the next card should be visible. Default is 50.
@IBInspectable public var visibleNextCardHeight: CGFloat = 50
/// Vertical spacing between the focussed card and the bottom (next) card. Default is 40.
@IBInspectable public var cardSpacing: CGFloat = 40
/// Allows you to set the view to Stack at the Top or at the Bottom. Default is true.
@IBInspectable public var isStackOnBottom: Bool = true
/// Sets how many cards of the stack are visible in the background
@IBInspectable public var stackedCardsCount: Int = 1
/** 
 Returns an array of indexes (as Int) that are currently visible in the `VerticalCardSwiperView`.
 This includes cards that are stacked (behind the focussed card).
*/
public var indexesForVisibleCards: [Int]

Other

Just like with a regular UICollectionView, you can reload the data by calling

cardSwiper.reloadData()

Get the current focussed card index

cardSwiper.focussedCardIndex

Scroll to a specifc card by calling

cardSwiper.scrollToCard(at: Int, animated: Bool) -> Bool

Get a card at a specified index

cardSwiper.cardForItem(at: Int) -> CardCell?

Swipe a card away programatically

cardSwiper.swipeCardAwayProgrammatically(at: Int, to: SwipeDirection, withDuration: TimeInterval = 0.3) -> Bool

Moving/Deleting/Inserting cards at runtime

Make sure to update your datasource first, otherwise an error will occur.

cardSwiper.moveCard(at: Int, to: Int)
cardSwiper.deleteCards(at: [Int])
cardSwiper.insertCards(at: [Int])

Delegation

To handle swipe gestures, implement the VerticalCardSwiperDelegate.

class ViewController: UIViewController, VerticalCardSwiperDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        cardSwiper.delegate = self
    }
    
    func willSwipeCardAway(card: CardCell, index: Int, swipeDirection: SwipeDirection) {
    
        // called right before the card animates off the screen (optional).
    }

    func didSwipeCardAway(card: CardCell, index: Int, swipeDirection: SwipeDirection) {

        // handle swipe gestures (optional).
    }
    
    func didCancelSwipe(card: CardCell, index: Int) {
        
        // Called when a card swipe is cancelled (when the threshold wasn't reached)
    }
    
    func sizeForItem(verticalCardSwiperView: VerticalCardSwiperView, index: Int) -> CGSize {
    
        // Allows you to return custom card sizes (optional).
        return CGSize(width: verticalCardSwiperView.frame.width * 0.75, height: verticalCardSwiperView.frame.height * 0.75)
    }
    
    func didScroll(verticalCardSwiperView: VerticalCardSwiperView) {
    
        // Tells the delegate when the user scrolls through the cards (optional).
    }
    
    func didEndScroll(verticalCardSwiperView: VerticalCardSwiperView) {
    
        // Tells the delegate when scrolling through the cards came to an end (optional).
    }
    
    func didDragCard(card: CardCell, index: Int, swipeDirection: SwipeDirection) {
    
        // Called when the user starts dragging a card to the side (optional).
    }
    
    func didTapCard(verticalCardSwiperView: VerticalCardSwiperView, index: Int) {
    
        // Tells the delegate when the user taps a card (optional).
    }
    
    func didHoldCard(verticalCardSwiperView: VerticalCardSwiperView, index: Int, state: UIGestureRecognizer.State) {
    
        // Tells the delegate when the user holds a card (optional).
    }
}

Customization

Subclass the CardCell to customize the cards.

class ExampleCardCell: CardCell {

}

Key Features

• Shazam Discover UI with paging
• Tinder-style swiping
• Option to disable side swiping
• Set custom number of stacked cards
• Code documentation in README.md file
• Cocoapods support
• Carthage support
• SPM support
• Diff support

Author

Joni Van Roost, [e-mail]

License

VerticalCardSwiper is available under the MIT license. See the LICENSE file for more info.

More

Feel free to submit a pull request, open an issue or fork this project. Any help is always appreciated. A big thank you to all the contributors!