🤖 CI: Add build-package workflow

- Decrement `swift-tools-version` from 6.0 to 5.10.0

Author: superturboryan

.github/workflows/build-package.yml

@@ -0,0 +1,39 @@
+name: Build Package
+
+on:
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: macos-latest
+
+    steps: 
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Setup Swift
+        uses: swift-actions/[email protected]
+        with:
+          swift-version: '5.10' # Should match swift-tools-version in Package.swift
+    
+      - name: Build Control Library
+        run:  |
+          xcodebuild -scheme Control \
+                     -sdk iphonesimulator \
+                     -configuration Release \
+                     -destination 'platform=iOS Simulator,name=iPhone 15,OS=latest' \
+                     BUILD_DIR=$(pwd)/build/Control
+
+      - name: Build Controllers Library
+        run: |
+          xcodebuild -scheme Controllers \
+                     -sdk iphonesimulator \
+                     -configuration Release \
+                     -destination 'platform=iOS Simulator,name=iPhone 15,OS=latest' \
+                     BUILD_DIR=$(pwd)/build/Controllers
+
+      # Disabled until unit tests are added
+      # - name: Run tests
+      #   run: swift test -v
+

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 6.0
+// swift-tools-version: 5.10.0
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription

Sources/Control/Volume.swift

@@ -31,9 +31,9 @@ public extension Control {
         public static var isMuted = false {
             didSet {
                 if isMuted {
-                    mutedVolumeLevel = volume
+                    Helpers.mutedVolumeLevel = volume
                 }
-                volume = isMuted ? 0 : mutedVolumeLevel
+                volume = isMuted ? 0 : Helpers.mutedVolumeLevel
             }
         }
 
@@ -44,7 +44,7 @@ public extension Control {
         /// - Important: Calling this function will _unmute_ the system volume. The increment amount is
         /// applied to the volume level prior to it being muted.
         public static func increaseVolume(
-            @BetweenZeroAndOneInclusive _ amount: Float = defaultVolumeStep
+            @BetweenZeroAndOneInclusive _ amount: Float = Helpers.defaultVolumeStep
         ) {
             if isMuted {
                 isMuted.toggle()
@@ -59,7 +59,7 @@ public extension Control {
         /// - Important: Calling this function will _unmute_ the system volume. The decrement amount is
         /// applied to the volume level prior to it being muted.
         public static func decreaseVolume(
-            @BetweenZeroAndOneInclusive _ amount: Float = defaultVolumeStep
+            @BetweenZeroAndOneInclusive _ amount: Float = Helpers.defaultVolumeStep
         ) {
             if isMuted {
                 isMuted.toggle()
@@ -71,12 +71,15 @@ public extension Control {
 
 extension Control.Volume {
 
-    /// Refers to the volume level prior to it being muted.
-    private static var mutedVolumeLevel: Float = 0
-    
-    /// Refers to the amount (on scale from 0 to 1) the volume is incremented/decremented when the volume rocker is pressed on the phone.
-    public static let defaultVolumeStep: Float = 1 / maxVolumeButtonPresses
-    
-    /// Refers to the number of (volume rocker) button presses it takes for the phone's volume to go from 0 to max.
-    private static let maxVolumeButtonPresses: Float = 16
+    public enum Helpers {
+        
+        /// Refers to the amount (on scale from 0 to 1) the volume is incremented/decremented when the volume rocker is pressed on the phone.
+        public static let defaultVolumeStep: Float = 1 / maxVolumeButtonPresses
+        
+        /// Refers to the volume level prior to it being muted.
+        static var mutedVolumeLevel: Float = 0
+        
+        /// Refers to the number of (volume rocker) button presses it takes for the phone's volume to go from 0 to max.
+        private static let maxVolumeButtonPresses: Float = 16
+    }
 }

Sources/Controllers/PlaybackController.swift

@@ -4,6 +4,7 @@
 //
 
 /// Describes an object that controls media/audio playback
+@MainActor
 protocol PlaybackController {
 
     func togglePlayPause()

Sources/Controllers/SystemController.swift

@@ -26,7 +26,7 @@ public final class SystemController: ObservableObject {
     }
 }
 
-extension SystemController: @preconcurrency PlaybackController {
+extension SystemController: PlaybackController {
 
     public func togglePlayPause() {
         switch selectedPlaybackType {