Sample data update

Landmarks/Models/Data.swift

@@ -0,0 +1,68 @@
+/*
+See LICENSE folder for this sample’s licensing information.
+
+Abstract:
+Helpers for loading images and data.
+*/
+
+import UIKit
+import SwiftUI
+import CoreLocation
+
+let landmarkData: [Landmark] = load("landmarkData.json")
+
+func load<T: Decodable>(_ filename: String) -> T {
+    let data: Data
+    
+    guard let file = Bundle.main.url(forResource: filename, withExtension: nil)
+        else {
+            fatalError("Couldn't find \(filename) in main bundle.")
+    }
+    
+    do {
+        data = try Data(contentsOf: file)
+    } catch {
+        fatalError("Couldn't load \(filename) from main bundle:\n\(error)")
+    }
+    
+    do {
+        let decoder = JSONDecoder()
+        return try decoder.decode(T.self, from: data)
+    } catch {
+        fatalError("Couldn't parse \(filename) as \(T.self):\n\(error)")
+    }
+}
+
+final class ImageStore {
+    typealias _ImageDictionary = [String: CGImage]
+    fileprivate var images: _ImageDictionary = [:]
+
+    fileprivate static var scale = 2
+    
+    static var shared = ImageStore()
+    
+    func image(name: String) -> Image {
+        let index = _guaranteeImage(name: name)
+        
+        return Image(images.values[index], scale: CGFloat(ImageStore.scale), label: Text(name))
+    }
+
+    static func loadImage(name: String) -> CGImage {
+        guard
+            let url = Bundle.main.url(forResource: name, withExtension: "jpg"),
+            let imageSource = CGImageSourceCreateWithURL(url as NSURL, nil),
+            let image = CGImageSourceCreateImageAtIndex(imageSource, 0, nil)
+        else {
+            fatalError("Couldn't load image \(name).jpg from main bundle.")
+        }
+        return image
+    }
+    
+    fileprivate func _guaranteeImage(name: String) -> _ImageDictionary.Index {
+        if let index = images.index(forKey: name) { return index }
+        
+        images[name] = ImageStore.loadImage(name: name)
+        return images.index(forKey: name)!
+    }
+}
+

Landmarks/Models/Landmark.swift

@@ -0,0 +1,42 @@
+/*
+See LICENSE folder for this sample’s licensing information.
+
+Abstract:
+The model for an individual landmark.
+*/
+
+import SwiftUI
+import CoreLocation
+
+struct Landmark: Hashable, Codable {
+    var id: Int
+    var name: String
+    fileprivate var imageName: String
+    fileprivate var coordinates: Coordinates
+    var state: String
+    var park: String
+    var category: Category
+
+    var locationCoordinate: CLLocationCoordinate2D {
+        CLLocationCoordinate2D(
+            latitude: coordinates.latitude,
+            longitude: coordinates.longitude)
+    }
+
+    enum Category: String, CaseIterable, Codable, Hashable {
+        case featured = "Featured"
+        case lakes = "Lakes"
+        case rivers = "Rivers"
+    }
+}
+
+extension Landmark {
+    var image: Image {
+        ImageStore.shared.image(name: imageName)
+    }
+}
+
+struct Coordinates: Hashable, Codable {
+    var latitude: Double
+    var longitude: Double
+}

Landmarks/Resources/landmarkData.json

@@ -0,0 +1,158 @@
+[
+    {
+        "name": "Turtle Rock",
+        "category": "Featured",
+        "city": "Twentynine Palms",
+        "state": "California",
+        "id": 1001,
+        "park": "Joshua Tree National Park",
+        "coordinates": {
+            "longitude": -116.166868,
+            "latitude": 34.011286
+        },
+        "imageName": "turtlerock"
+    },
+    {
+        "name": "Silver Salmon Creek",
+        "category": "Lakes",
+        "city": "Port Alsworth",
+        "state": "Alaska",
+        "id": 1002,
+        "park": "Lake Clark National Park and Preserve",
+        "coordinates": {
+            "longitude": -152.665167,
+            "latitude": 59.980167
+        },
+        "imageName": "silversalmoncreek"
+    },
+    {
+        "name": "Chilkoot Trail",
+        "category": "Rivers",
+        "city": "Skagway",
+        "state": "Alaska",
+        "id": 1003,
+        "park": "Klondike Gold Rush National Historical Park",
+        "coordinates": {
+            "longitude": -135.334571,
+            "latitude": 59.560551
+        },
+        "imageName": "chilkoottrail"
+    },
+    {
+        "name": "St. Mary Lake",
+        "category": "Lakes",
+        "city": "Browning",
+        "state": "Montana",
+        "id": 1004,
+        "park": "Glacier National Park",
+        "coordinates": {
+            "longitude": -113.536248,
+            "latitude": 48.69423
+        },
+        "imageName": "stmarylake"
+    },
+    {
+        "name": "Twin Lake",
+        "category": "Lakes",
+        "city": "Twin Lakes",
+        "state": "Alaska",
+        "id": 1005,
+        "park": "Lake Clark National Park and Preserve",
+        "coordinates": {
+            "longitude": -153.849883,
+            "latitude": 60.641684
+        },
+        "imageName": "twinlake"
+    },
+    {
+        "name": "Lake McDonald",
+        "category": "Lakes",
+        "city": "West Glacier",
+        "state": "Montana",
+        "id": 1006,
+        "park": "Glacier National Park",
+        "coordinates": {
+            "longitude": -113.934831,
+            "latitude": 48.56002
+        },
+        "imageName": "lakemcdonald"
+    },
+    {
+        "name": "Charley Rivers",
+        "category": "Rivers",
+        "city": "Eaking",
+        "state": "Alaska",
+        "id": 1007,
+        "park": "Charley Rivers National Preserve",
+        "coordinates": {
+            "longitude": -143.122586,
+            "latitude": 65.350021
+        },
+        "imageName": "yukon_charleyrivers"
+    },
+    {
+        "name": "Icy Bay",
+        "category": "Lakes",
+        "city": "Icy Bay",
+        "state": "Alaska",
+        "id": 1008,
+        "park": "Wrangell-St. Elias National Park and Preserve",
+        "coordinates": {
+            "longitude": -141.518167,
+            "latitude": 60.089917
+        },
+        "imageName": "icybay"
+    },
+    {
+        "name": "Rainbow Lake",
+        "category": "Lakes",
+        "city": "Willow",
+        "state": "Alaska",
+        "id": 1009,
+        "park": "State Recreation Area",
+        "coordinates": {
+            "longitude": -150.086103,
+            "latitude": 61.694334
+        },
+        "imageName": "rainbowlake"
+    },
+    {
+        "name": "Hidden Lake",
+        "category": "Lakes",
+        "city": "Newhalem",
+        "state": "Washington",
+        "id": 1010,
+        "park": "North Cascades National Park",
+        "coordinates": {
+            "longitude": -121.17799,
+            "latitude": 48.495442
+        },
+        "imageName": "hiddenlake"
+    },
+    {
+        "name": "Chincoteague",
+        "category": "Rivers",
+        "city": "Chincoteague",
+        "state": "Virginia",
+        "id": 1011,
+        "park": "Chincoteague National Wildlife Refuge",
+        "coordinates": {
+            "longitude": -75.383212,
+            "latitude": 37.91531
+        },
+        "imageName": "chincoteague"
+    },
+    {
+        "name": "Lake Umbagog",
+        "category": "Lakes",
+        "city": "Errol",
+        "state": "New Hampshire",
+        "id": 1012,
+        "park": "Umbagog National Wildlife Refuge",
+        "coordinates": {
+            "longitude": -71.056816,
+            "latitude": 44.747408
+        },
+        "imageName": "umbagog"
+    }
+]