Slide-over card (like in Maps or Stocks) using SwiftUI

ContentView.swift

import SwiftUI

struct ContentView : View { 
    var body: some View {
        ZStack(alignment: Alignment.top) {
            MapView()
            SlideOverCard {
                VStack {
                    CoverImage(imageName: "maitlandbay")
                    Text("Maitland Bay")
                        .font(.headline)
                    Spacer()
                }
            }
        }
        .edgesIgnoringSafeArea(.vertical)
    }
}

Handle.swift

import SwiftUI

struct Handle : View {
    private let handleThickness = CGFloat(5.0)
    var body: some View {
        RoundedRectangle(cornerRadius: handleThickness / 2.0)
            .frame(width: 40, height: handleThickness)
            .foregroundColor(Color.secondary)
            .padding(5)
    }
}

MapView.swift

import SwiftUI
import MapKit

struct MapView : UIViewRepresentable {
    func makeUIView(context: Context) -> MKMapView {
        MKMapView(frame: .zero)
    }
    
    func updateUIView(_ view: MKMapView, context: Context) {
        let coordinate = CLLocationCoordinate2D(
            latitude: -33.523065, longitude: 151.394551)
        let span = MKCoordinateSpan(latitudeDelta: 0.2, longitudeDelta: 0.2)
        let region = MKCoordinateRegion(center: coordinate, span: span)
        view.setRegion(region, animated: true)
    }
}

SlideOverCard.swift

import SwiftUI

struct SlideOverCard<Content: View> : View {
    @GestureState private var dragState = DragState.inactive
    @State var position = CardPosition.top
    
    var content: () -> Content
    var body: some View {
        let drag = DragGesture()
            .updating($dragState) { drag, state, transaction in
                state = .dragging(translation: drag.translation)
            }
            .onEnded(onDragEnded)
        
        return Group {
            Handle()
            self.content()
        }
        .frame(height: UIScreen.main.bounds.height)
        .background(Color.white)
        .cornerRadius(10.0)
        .shadow(color: Color(.sRGBLinear, white: 0, opacity: 0.13), radius: 10.0)
        .offset(y: self.position.rawValue + self.dragState.translation.height)
        .animation(self.dragState.isDragging ? nil : .interpolatingSpring(stiffness: 300.0, damping: 30.0, initialVelocity: 10.0))
        .gesture(drag)
    }
    
    private func onDragEnded(drag: DragGesture.Value) {
        let verticalDirection = drag.predictedEndLocation.y - drag.location.y
        let cardTopEdgeLocation = self.position.rawValue + drag.translation.height
        let positionAbove: CardPosition
        let positionBelow: CardPosition
        let closestPosition: CardPosition
        
        if cardTopEdgeLocation <= CardPosition.middle.rawValue {
            positionAbove = .top
            positionBelow = .middle
        } else {
            positionAbove = .middle
            positionBelow = .bottom
        }
        
        if (cardTopEdgeLocation - positionAbove.rawValue) < (positionBelow.rawValue - cardTopEdgeLocation) {
            closestPosition = positionAbove
        } else {
            closestPosition = positionBelow
        }
        
        if verticalDirection > 0 {
            self.position = positionBelow
        } else if verticalDirection < 0 {
            self.position = positionAbove
        } else {
            self.position = closestPosition
        }
    }
}

enum CardPosition: CGFloat {
    case top = 100
    case middle = 500
    case bottom = 850
}

enum DragState {
    case inactive
    case dragging(translation: CGSize)
    
    var translation: CGSize {
        switch self {
        case .inactive:
            return .zero
        case .dragging(let translation):
            return translation
        }
    }
    
    var isDragging: Bool {
        switch self {
        case .inactive:
            return false
        case .dragging:
            return true
        }
    }
}

@chakkaradeep yea CoverImage was a custom component that just contained the image to display and handled the right aspect ratio / cropping. Glad that package is working for you, though will just clarify that it was contributed by someone else :)

Also, I haven't tested this yet but I'm pretty sure you can achieve this behaviour using the native sheet API these days. This example is still fun for a learning and customisation, though.