chrisharper22's submission for Challenge 2

chrisharper22/AirDrop/AirDrop.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

chrisharper22/AirDrop/AirDrop/AirDrop.entitlements

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>com.apple.security.app-sandbox</key>
+    <true/>
+    <key>com.apple.security.files.user-selected.read-only</key>
+    <true/>
+</dict>
+</plist>

chrisharper22/AirDrop/AirDrop/AirDropApp.swift

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+//
+//  AirDropApp.swift
+//  AirDrop
+//
+//  Created by Chris Harper on 7/30/22.
+//
+
+import SwiftUI
+
+@main
+struct AirDropApp: App {
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+        }
+    }
+}

chrisharper22/AirDrop/AirDrop/Assets.xcassets/AccentColor.colorset/Contents.json

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+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

chrisharper22/AirDrop/AirDrop/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "16x16"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "16x16"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "32x32"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "32x32"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "128x128"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "128x128"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "256x256"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "256x256"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "512x512"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "512x512"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

chrisharper22/AirDrop/AirDrop/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

chrisharper22/AirDrop/AirDrop/ContentView.swift

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+//
+//  ContentView.swift
+//  AirDrop
+//
+//  Created by Chris Harper on 7/30/22.
+//
+
+import SwiftUI
+
+struct ContentView: View {
+	@ObservedObject var viewModel = AirDropAvatarViewModel()
+
+	var body: some View {
+		VStack(spacing: 20) {
+			Spacer()
+			AirDropAvatar(model: viewModel)
+				.frame(width: 225, height: 225)
+			textStack
+			Spacer()
+			actionButton
+		}
+		.padding()
+		.frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .center)
+		.background {
+			Color(uiColor: .secondarySystemGroupedBackground)
+				.edgesIgnoringSafeArea(.all)
+		}
+	}
+
+	var textStack: some View {
+		VStack {
+			Text("Colton Westfield") // some random name just because
+			Group {
+				if viewModel.state != .waiting {
+					Text(viewModel.stateText)
+						.opacity(viewModel.stateOpacity)
+				} else {
+					Text(viewModel.stateText)
+						.opacity(viewModel.stateOpacity)
+						.animation(viewModel.state == .waiting ? .easeInOut(duration: 0.75) : .none, value: viewModel.stateOpacity)
+				}
+			}
+			.onReceive(viewModel.timer) { _ in
+				viewModel.updateStateOpacity()
+			}
+			.foregroundColor(viewModel.stateColor)
+		}
+		.font(.title2)
+	}
+
+	var actionButton: some View {
+		Button(role: viewModel.buttonRole) {
+			viewModel.buttonAction()
+		} label: {
+			Text(viewModel.buttonText)
+				.frame(width: 250)
+		}
+		.controlSize(.large)
+		.buttonStyle(.borderedProminent)
+		.disabled(viewModel.running)
+	}
+}
+
+struct ContentView_Previews: PreviewProvider {
+	static var previews: some View {
+		ContentView()
+			.preferredColorScheme(.dark)
+	}
+}

chrisharper22/AirDrop/AirDrop/Preview Content/Preview Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

chrisharper22/AirDrop/AirDrop/Utilities/Extensions/Task+sleep.swift

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+//
+//  Task+sleep.swift
+//  AirDrop
+//
+//  Created by Chris Harper on 7/30/22.
+//
+
+import Foundation
+
+public extension Task where Success == Never, Failure == Never {
+	///Suspends the current task for at least the given duration in seconds.
+	static func sleep(seconds duration: Double) async throws {
+		let duration = UInt64(duration * 1_000_000_000)
+		try await Task.sleep(nanoseconds: duration)
+	}
+}

chrisharper22/AirDrop/AirDrop/Utilities/Models/AirDropAvatarViewModel.swift

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+//
+//  AirDropAvatarViewModel.swift
+//  AirDrop
+//
+//  Created by Chris Harper on 7/30/22.
+//
+
+import Combine
+import SwiftUI
+
+/// The view model for a `AirDropAvatar`,
+@MainActor class AirDropAvatarViewModel: ObservableObject {
+	/// The current state of AirDrop, as an ``AirDropState``.
+	@Published var state: AirDropState = .idle
+	/// The progress of AirDrop.
+	@Published var progress: Double = 0.0
+	/// The opacity of the AirDrop progress indicator.
+	@Published var progressOpacity: Double = 0.0
+	/// The opacity of the AirDrop state text.
+	@Published var stateOpacity: Double = 1.0
+	/// The timer responsible for the flashing of the AirDrop state text when waiting.
+	@Published var timer = Timer.publish(every: 0.75, on: .main, in: .common).autoconnect()
+
+	/// The possible states of AirDrop.
+	enum AirDropState {
+		/// An idle state.
+		case idle
+		/// A waiting state.
+		case waiting
+		/// A sending state in which data is being transferred.
+		case sending
+		/// A completed state where data transfer is complete.
+		case complete
+	}
+
+	/// The text of an ``AirDropState``.
+	var stateText: String {
+		switch state {
+		case .idle:
+			return " "
+		case .waiting:
+			return "Waiting..."
+		case .sending:
+			return "Sending..."
+		case .complete:
+			return "Sent"
+		}
+	}
+
+	/// A `Bool` indicating whether or not AirDrop is running.
+	var running: Bool {
+		switch state {
+		case .idle, .complete:
+			return false
+		case .waiting, .sending:
+			return true
+		}
+	}
+
+	/// The text of the button as a result of the current ``AirDropState``.
+	var buttonText: String {
+		switch state {
+		case .idle:
+			return "Start"
+		case .waiting, .sending:
+			return "Running"
+		case .complete:
+			return "Reset"
+		}
+	}
+
+	/// Set the state opacity according to the current A``AirDropState``.
+	func updateStateOpacity() {
+		switch state {
+		case .idle:
+			stateOpacity = 0
+		case .waiting:
+			stateOpacity == 0 ? (stateOpacity = 1.0) : (stateOpacity = 0.0)
+		default:
+			stateOpacity = 1.0
+		}
+	}
+
+	/// The action of the button as a result of the current ``AirDropState``.
+	func buttonAction() {
+		switch state {
+		case .idle:
+			Task { await prepareAirDrop() }
+		case .complete:
+			resetAirDrop()
+		default:
+			fatalError("AvatarViewModel.buttonAction(): really, this shouldn't have happened.")
+		}
+	}
+
+	/// The role of the button as a result of the current ``AirDropState``.
+	var buttonRole: ButtonRole? {
+		switch state {
+		case .idle, .waiting, .sending:
+			return .none
+		case .complete:
+			return .destructive
+		}
+	}
+
+	/// The color of an ``AirDropState``.
+	var stateColor: Color {
+		switch state {
+		case .idle:
+			return .primary
+		case .waiting, .sending:
+			return .secondary
+		case .complete:
+			return .accentColor
+		}
+	}
+
+	/// Resets properties to their defaults.
+	private func resetAirDrop() {
+		state = .idle
+		progressOpacity = 0.0
+		progress = 0.0
+		stateOpacity = 1.0
+	}
+
+	/// The first stage of the AirDrop animation.
+	private func prepareAirDrop() async {
+		state = .waiting
+		progressOpacity = 1.0
+		await commenceAirDrop()
+	}
+
+	/// The second stage of the AirDrop animation.
+	private func commenceAirDrop() async {
+		try? await Task.sleep(seconds: 5)
+		state = .sending
+		progress = 1.0
+		await finishAirDrop()
+	}
+
+	/// The third stage of the AirDrop animation.
+	private func finishAirDrop() async {
+		try? await Task.sleep(seconds: 3.25)
+		state = .complete
+		try? await Task.sleep(seconds: 1.25)
+		progressOpacity = 0.0
+	}
+}