SwiftBounty

TinderSwipeCard.swift

import SwiftUI
import PlaygroundSupport

extension View {
  func debug(_ value: Any) -> Self {
    dump(value)
    return self
  }
}

struct CardSwiper: View {
  @State var dragMovement: CGSize = .zero
  @State var combined: CGSize = .zero
  @State var angleFloat: CGFloat = .zero
  @State var gestureActive: Bool = false
  
  var scale: CGFloat {
    return gestureActive ? 1.05 : 1
  }
  var angle: Angle { Angle.init(degrees: Double(
    sqrt(pow(dragMovement.height, 2) + pow(dragMovement.width, 2)) * 0.1 * dragMovement.width/(abs(dragMovement.width) + 1)
    
  )) }
  
  var body: some View {
    VStack {
      Text("tH \(Int(combined.height)) tW \(Int(combined.width))")
      Text("tH \(Int(dragMovement.height)) tW \(Int(dragMovement.width))")
      HStack {
        Text("\(Int(angleFloat))º")
        Slider(value: $angleFloat, in: 0...360)
      }.padding()
      
      RoundedRectangle(cornerRadius: 10)
        .foregroundColor(.blue)
        .frame(width: 200, height: 400, alignment: .center)
        .offset(x: dragMovement.width, y: dragMovement.height)
        .rotationEffect(angle, anchor: .bottom)
        .scaleEffect(scale)
        .gesture(
          DragGesture()
            .onChanged { val in
              self.dragMovement = val.translation
              self.gestureActive = true
          }
          .onEnded { val in
            self.dragMovement = .zero
            self.gestureActive = false
            self.shouldCardBeDismissed(val.translation, val.predictedEndTranslation)
          }
      )
      
    }
  }
  
  func shouldCardBeDismissed(_ translation: CGSize, _ predictedEndTranslation: CGSize) {
    let combined = CGSize(width: (translation.width + predictedEndTranslation.width), height: (translation.height + predictedEndTranslation.height))
    self.combined = combined
  }
}

PlaygroundPage.current.setLiveView(CardSwiper())

Structure and Algorithm credits: https://github.com/NathanLawrence/SwiftRight