├── .gitignore ├── README.md ├── SwiftUIPropertyWrapperTalk ├── Assets.xcassets │ ├── Contents.json │ ├── AccentColor.colorset │ │ └── Contents.json │ └── AppIcon.appiconset │ │ └── Contents.json ├── Preview Content │ └── Preview Assets.xcassets │ │ └── Contents.json ├── ContentView.swift ├── SwiftUIPropertyWrapperTalkApp.swift ├── StringSample.swift ├── Post.swift └── RemoteData.swift ├── SwiftUI_Property_Wrappers_2022.pdf ├── SwiftUIPropertyWrapperTalk.xcodeproj ├── project.xcworkspace │ ├── contents.xcworkspacedata │ └── xcshareddata │ │ └── IDEWorkspaceChecks.plist ├── xcuserdata │ └── donnywals.xcuserdatad │ │ └── xcschemes │ │ └── xcschememanagement.plist └── project.pbxproj └── SwiftUIPropertyWrapperTalkTests └── SwiftUIPropertyWrapperTalkTests.swift /.gitignore: -------------------------------------------------------------------------------- 1 | /DS_Store 2 | xcuserdata 3 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Hey! 2 | 3 | This repo is just a small sample to go along with my talk on property wrappers in SwiftUI. 4 | -------------------------------------------------------------------------------- /SwiftUIPropertyWrapperTalk/Assets.xcassets/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "info" : { 3 | "author" : "xcode", 4 | "version" : 1 5 | } 6 | } 7 | -------------------------------------------------------------------------------- /SwiftUI_Property_Wrappers_2022.pdf: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/donnywals/SwiftUIPropertyWrapperTalk/HEAD/SwiftUI_Property_Wrappers_2022.pdf -------------------------------------------------------------------------------- /SwiftUIPropertyWrapperTalk/Preview Content/Preview Assets.xcassets/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "info" : { 3 | "author" : "xcode", 4 | "version" : 1 5 | } 6 | } 7 | -------------------------------------------------------------------------------- /SwiftUIPropertyWrapperTalk.xcodeproj/project.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /SwiftUIPropertyWrapperTalk/Assets.xcassets/AccentColor.colorset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "colors" : [ 3 | { 4 | "idiom" : "universal" 5 | } 6 | ], 7 | "info" : { 8 | "author" : "xcode", 9 | "version" : 1 10 | } 11 | } 12 | -------------------------------------------------------------------------------- /SwiftUIPropertyWrapperTalk.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | IDEDidComputeMac32BitWarning 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /SwiftUIPropertyWrapperTalk/ContentView.swift: -------------------------------------------------------------------------------- 1 | // 2 | // ContentView.swift 3 | // SwiftUIPropertyWrapperTalk 4 | // 5 | // Created by Donny Wals on 14/06/2022. 6 | // 7 | 8 | import SwiftUI 9 | 10 | struct PostsView: View { 11 | @RemoteData(endpoint: .feed) var feed: [Post] 12 | 13 | var body: some View { 14 | List(feed) { post in 15 | Text(post.title) 16 | } 17 | } 18 | } 19 | -------------------------------------------------------------------------------- /SwiftUIPropertyWrapperTalk/SwiftUIPropertyWrapperTalkApp.swift: -------------------------------------------------------------------------------- 1 | // 2 | // SwiftUIPropertyWrapperTalkApp.swift 3 | // SwiftUIPropertyWrapperTalk 4 | // 5 | // Created by Donny Wals on 14/06/2022. 6 | // 7 | 8 | import SwiftUI 9 | 10 | @main 11 | struct SwiftUIPropertyWrapperTalkApp: App { 12 | var body: some Scene { 13 | WindowGroup { 14 | PostsView() 15 | .environment(\.urlSession, URLSession.shared) 16 | } 17 | } 18 | } 19 | -------------------------------------------------------------------------------- /SwiftUIPropertyWrapperTalk.xcodeproj/xcuserdata/donnywals.xcuserdatad/xcschemes/xcschememanagement.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | SchemeUserState 6 | 7 | SwiftUIPropertyWrapperTalk.xcscheme_^#shared#^_ 8 | 9 | orderHint 10 | 0 11 | 12 | 13 | 14 | 15 | -------------------------------------------------------------------------------- /SwiftUIPropertyWrapperTalk/StringSample.swift: -------------------------------------------------------------------------------- 1 | // 2 | // StringSample.swift 3 | // SwiftUIPropertyWrapperTalk 4 | // 5 | // Created by Donny Wals on 14/06/2022. 6 | // 7 | 8 | import Foundation 9 | 10 | @propertyWrapper 11 | struct StringSample { 12 | let wrappedValue: String 13 | 14 | var projectedValue: String { 15 | "Projected: \(wrappedValue)" 16 | } 17 | } 18 | 19 | struct SampleUsage { 20 | @StringSample var example = "Hello, world" 21 | 22 | func printSample() { 23 | print(example) // "Hello, world" 24 | print(_example) // StringSample 25 | print($example) // "Projected: Hello, world" 26 | } 27 | } 28 | -------------------------------------------------------------------------------- /SwiftUIPropertyWrapperTalk/Post.swift: -------------------------------------------------------------------------------- 1 | // 2 | // Post.swift 3 | // SwiftUIPropertyWrapperTalk 4 | // 5 | // Created by Donny Wals on 14/06/2022. 6 | // 7 | 8 | import Foundation 9 | 10 | public struct Post: Codable, Identifiable, Hashable, Equatable { 11 | public let id: Int 12 | public let title: String 13 | 14 | public init(from decoder: Decoder) throws { 15 | let container = try decoder.container(keyedBy: CodingKeys.self) 16 | self.id = try container.decode(Int.self, forKey: .id) 17 | 18 | let titleContainer = try container.nestedContainer(keyedBy: TitleCodingKeys.self, forKey: .title) 19 | self.title = try titleContainer.decode(String.self, forKey: .rendered) 20 | } 21 | } 22 | 23 | extension Post { 24 | enum CodingKeys: CodingKey { 25 | case id 26 | case title 27 | } 28 | 29 | enum TitleCodingKeys: CodingKey { 30 | case rendered 31 | } 32 | } 33 | -------------------------------------------------------------------------------- /SwiftUIPropertyWrapperTalk/Assets.xcassets/AppIcon.appiconset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "idiom" : "iphone", 5 | "scale" : "2x", 6 | "size" : "20x20" 7 | }, 8 | { 9 | "idiom" : "iphone", 10 | "scale" : "3x", 11 | "size" : "20x20" 12 | }, 13 | { 14 | "idiom" : "iphone", 15 | "scale" : "2x", 16 | "size" : "29x29" 17 | }, 18 | { 19 | "idiom" : "iphone", 20 | "scale" : "3x", 21 | "size" : "29x29" 22 | }, 23 | { 24 | "idiom" : "iphone", 25 | "scale" : "2x", 26 | "size" : "40x40" 27 | }, 28 | { 29 | "idiom" : "iphone", 30 | "scale" : "3x", 31 | "size" : "40x40" 32 | }, 33 | { 34 | "idiom" : "iphone", 35 | "scale" : "2x", 36 | "size" : "60x60" 37 | }, 38 | { 39 | "idiom" : "iphone", 40 | "scale" : "3x", 41 | "size" : "60x60" 42 | }, 43 | { 44 | "idiom" : "ipad", 45 | "scale" : "1x", 46 | "size" : "20x20" 47 | }, 48 | { 49 | "idiom" : "ipad", 50 | "scale" : "2x", 51 | "size" : "20x20" 52 | }, 53 | { 54 | "idiom" : "ipad", 55 | "scale" : "1x", 56 | "size" : "29x29" 57 | }, 58 | { 59 | "idiom" : "ipad", 60 | "scale" : "2x", 61 | "size" : "29x29" 62 | }, 63 | { 64 | "idiom" : "ipad", 65 | "scale" : "1x", 66 | "size" : "40x40" 67 | }, 68 | { 69 | "idiom" : "ipad", 70 | "scale" : "2x", 71 | "size" : "40x40" 72 | }, 73 | { 74 | "idiom" : "ipad", 75 | "scale" : "2x", 76 | "size" : "76x76" 77 | }, 78 | { 79 | "idiom" : "ipad", 80 | "scale" : "2x", 81 | "size" : "83.5x83.5" 82 | }, 83 | { 84 | "idiom" : "ios-marketing", 85 | "scale" : "1x", 86 | "size" : "1024x1024" 87 | } 88 | ], 89 | "info" : { 90 | "author" : "xcode", 91 | "version" : 1 92 | } 93 | } 94 | -------------------------------------------------------------------------------- /SwiftUIPropertyWrapperTalkTests/SwiftUIPropertyWrapperTalkTests.swift: -------------------------------------------------------------------------------- 1 | // 2 | // SwiftUIPropertyWrapperTalkTests.swift 3 | // SwiftUIPropertyWrapperTalkTests 4 | // 5 | // Created by Donny Wals on 15/06/2022. 6 | // 7 | 8 | import XCTest 9 | import SwiftUI 10 | import Combine 11 | @testable import SwiftUIPropertyWrapperTalk 12 | 13 | class CustomWrapperTest: XCTestCase { 14 | let app = UIViewController() 15 | 16 | final func host(_ view: V) { 17 | let hosting = UIHostingController(rootView: view) 18 | hosting.view.translatesAutoresizingMaskIntoConstraints = false 19 | app.addChild(hosting) 20 | app.view.addSubview(hosting.view) 21 | NSLayoutConstraint.activate([ 22 | hosting.view.leadingAnchor.constraint(equalTo: app.view.leadingAnchor), 23 | hosting.view.topAnchor.constraint(equalTo: app.view.topAnchor), 24 | hosting.view.trailingAnchor.constraint(equalTo: app.view.trailingAnchor), 25 | hosting.view.bottomAnchor.constraint(equalTo: app.view.bottomAnchor), 26 | ]) 27 | app.view.layoutIfNeeded() 28 | } 29 | } 30 | 31 | struct SampleTestView: View { 32 | @RemoteData(endpoint: .feed) var feed: [Post] 33 | 34 | let resultSubject = PassthroughSubject<[Post], Never>() 35 | 36 | init() { 37 | print("init") 38 | } 39 | 40 | var body: some View { 41 | Text("This is just a test view...") 42 | .onAppear { 43 | print("on appear") 44 | resultSubject.send(feed) 45 | } 46 | .onChange(of: feed) { newFeed in 47 | print("on change: \(newFeed)") 48 | resultSubject.send(newFeed) 49 | } 50 | } 51 | } 52 | 53 | class SwiftUIPropertyWrapperTalkTests: CustomWrapperTest { 54 | 55 | var cancellables = Set() 56 | 57 | func testRemoteDataIsEventuallyAvailable() throws { 58 | let view = SampleTestView() 59 | 60 | let expect = expectation(description: "expected data to be loaded") 61 | view.resultSubject.sink { posts in 62 | if !posts.isEmpty { 63 | expect.fulfill() 64 | } 65 | }.store(in: &cancellables) 66 | 67 | host(view.environment(\.urlSession, URLSession.shared)) 68 | 69 | waitForExpectations(timeout: 1) 70 | } 71 | } 72 | -------------------------------------------------------------------------------- /SwiftUIPropertyWrapperTalk/RemoteData.swift: -------------------------------------------------------------------------------- 1 | // 2 | // RemoteData.swift 3 | // SwiftUIPropertyWrapperTalk 4 | // 5 | // Created by Donny Wals on 14/06/2022. 6 | // 7 | 8 | import Foundation 9 | import SwiftUI 10 | 11 | private struct URLSessionKey: EnvironmentKey { 12 | static let defaultValue: URLSession = { 13 | URLSession.shared 14 | }() 15 | } 16 | 17 | extension EnvironmentValues { 18 | var urlSession: URLSession { 19 | get { self[URLSessionKey.self] } 20 | set { self[URLSessionKey.self] = newValue } 21 | } 22 | } 23 | 24 | @propertyWrapper 25 | struct RemoteData: DynamicProperty { 26 | @StateObject private var dataLoader = DataLoader() 27 | private let endpoint: Endpoint 28 | 29 | var wrappedValue: [Post] { 30 | dataLoader.loadedData 31 | } 32 | 33 | init(endpoint: Endpoint) { 34 | self.endpoint = endpoint 35 | } 36 | 37 | @Environment(\.urlSession) var urlSession 38 | 39 | func update() { 40 | if dataLoader.urlSession == nil || dataLoader.endpoint == nil { 41 | dataLoader.urlSession = urlSession 42 | dataLoader.endpoint = endpoint 43 | } 44 | 45 | dataLoader.fetchDataIfNeeded() 46 | } 47 | } 48 | 49 | class DataLoader: ObservableObject { 50 | @Published var loadedData: [Post] = [] 51 | private var isLoadingData = false 52 | 53 | var urlSession: URLSession? 54 | var endpoint: RemoteData.Endpoint? 55 | 56 | init() { } 57 | 58 | func fetchDataIfNeeded() { 59 | guard let urlSession = urlSession, let endpoint = endpoint, 60 | !isLoadingData && loadedData.isEmpty else { 61 | return 62 | } 63 | 64 | isLoadingData = true 65 | let url = URL.for(endpoint) 66 | urlSession.dataTask(with: url) { data, response, error in 67 | guard let data = data else { 68 | /* ... */ 69 | return 70 | } 71 | 72 | DispatchQueue.main.async { 73 | self.loadedData = try! JSONDecoder() 74 | .decode([Post].self, from: data) 75 | } 76 | self.isLoadingData = false 77 | }.resume() 78 | } 79 | } 80 | 81 | extension RemoteData { 82 | enum Endpoint { 83 | case feed 84 | } 85 | } 86 | 87 | extension URL { 88 | static func `for`(_ endpoint: RemoteData.Endpoint) -> URL { 89 | return URL(string: "https://donnywals.com/wp-json/wp/v2/posts")! 90 | } 91 | } 92 | 93 | -------------------------------------------------------------------------------- /SwiftUIPropertyWrapperTalk.xcodeproj/project.pbxproj: -------------------------------------------------------------------------------- 1 | // !$*UTF8*$! 2 | { 3 | archiveVersion = 1; 4 | classes = { 5 | }; 6 | objectVersion = 55; 7 | objects = { 8 | 9 | /* Begin PBXBuildFile section */ 10 | 979F2B3E2858FD3C000963F8 /* SwiftUIPropertyWrapperTalkApp.swift in Sources */ = {isa = PBXBuildFile; fileRef = 979F2B3D2858FD3C000963F8 /* SwiftUIPropertyWrapperTalkApp.swift */; }; 11 | 979F2B402858FD3C000963F8 /* ContentView.swift in Sources */ = {isa = PBXBuildFile; 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