Fix concurrency warnings (#424)

Co-authored-by: David Roman <2538074+davdroman@users.noreply.github.com>

Author: GeorgeElsham

Examples/Showcase/Showcase.xcodeproj/project.pbxproj

@@ -209,6 +209,8 @@
 				SUPPORTS_MACCATALYST = YES;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_STRICT_CONCURRENCY = complete;
+				SWIFT_VERSION = 6.0;
 				TVOS_DEPLOYMENT_TARGET = 13.0;
 				XROS_DEPLOYMENT_TARGET = 1.0;
 			};
@@ -268,6 +270,8 @@
 				SUPPORTS_MACCATALYST = YES;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
+				SWIFT_STRICT_CONCURRENCY = complete;
+				SWIFT_VERSION = 6.0;
 				TVOS_DEPLOYMENT_TARGET = 13.0;
 				VALIDATE_PRODUCT = YES;
 				XROS_DEPLOYMENT_TARGET = 1.0;

Package.swift

@@ -19,5 +19,9 @@ let package = Package(
             name: "SwiftUIIntrospect",
             path: "Sources"
         ),
+    ],
+    swiftLanguageVersions: [
+        .v5,
+        .version("6.0"),
     ]
 )

Sources/Introspect.swift

@@ -4,7 +4,7 @@ import SwiftUI
 /// The scope of introspection i.e. where introspect should look to find
 /// the desired target view relative to the applied `.introspect(...)`
 /// modifier.
-public struct IntrospectionScope: OptionSet {
+public struct IntrospectionScope: OptionSet, Sendable {
     /// Look within the `receiver` of the `.introspect(...)` modifier.
     public static let receiver = Self(rawValue: 1 << 0)
     /// Look for an `ancestor` relative to the `.introspect(...)` modifier.
@@ -96,6 +96,7 @@ struct IntrospectModifier<SwiftUIViewType: IntrospectableViewType, PlatformSpeci
     }
 }
 
+@MainActor
 public protocol PlatformEntity: AnyObject {
     associatedtype Base: PlatformEntity
 

Sources/IntrospectionSelector.swift

@@ -1,11 +1,11 @@
 #if !os(watchOS)
 @_spi(Advanced)
-public struct IntrospectionSelector<Target: PlatformEntity> {
+public struct IntrospectionSelector<Target: PlatformEntity>: Sendable {
     @_spi(Advanced)
     public static var `default`: Self { .from(Target.self, selector: { $0 }) }
 
     @_spi(Advanced)
-    public static func from<Entry: PlatformEntity>(_ entryType: Entry.Type, selector: @escaping (Entry) -> Target?) -> Self {
+    public static func from<Entry: PlatformEntity>(_ entryType: Entry.Type, selector: @MainActor @Sendable @escaping (Entry) -> Target?) -> Self {
         .init(
             receiverSelector: { controller in
                 controller.as(Entry.Base.self)?.receiver(ofType: Entry.self).flatMap(selector)
@@ -16,32 +16,32 @@ public struct IntrospectionSelector<Target: PlatformEntity> {
         )
     }
 
-    private var receiverSelector: (IntrospectionPlatformViewController) -> Target?
-    private var ancestorSelector: (IntrospectionPlatformViewController) -> Target?
+    private var receiverSelector: @MainActor @Sendable (IntrospectionPlatformViewController) -> Target?
+    private var ancestorSelector: @MainActor @Sendable (IntrospectionPlatformViewController) -> Target?
 
     private init(
-        receiverSelector: @escaping (IntrospectionPlatformViewController) -> Target?,
-        ancestorSelector: @escaping (IntrospectionPlatformViewController) -> Target?
+        receiverSelector: @MainActor @Sendable @escaping (IntrospectionPlatformViewController) -> Target?,
+        ancestorSelector: @MainActor @Sendable @escaping (IntrospectionPlatformViewController) -> Target?
     ) {
         self.receiverSelector = receiverSelector
         self.ancestorSelector = ancestorSelector
     }
 
     @_spi(Advanced)
-    public func withReceiverSelector(_ selector: @escaping (PlatformViewController) -> Target?) -> Self {
+    public func withReceiverSelector(_ selector: @MainActor @Sendable @escaping (PlatformViewController) -> Target?) -> Self {
         var copy = self
         copy.receiverSelector = selector
         return copy
     }
 
     @_spi(Advanced)
-    public func withAncestorSelector(_ selector: @escaping (PlatformViewController) -> Target?) -> Self {
+    public func withAncestorSelector(_ selector: @MainActor @Sendable @escaping (PlatformViewController) -> Target?) -> Self {
         var copy = self
         copy.ancestorSelector = selector
         return copy
     }
 
-    func callAsFunction(_ controller: IntrospectionPlatformViewController, _ scope: IntrospectionScope) -> Target? {
+    @MainActor func callAsFunction(_ controller: IntrospectionPlatformViewController, _ scope: IntrospectionScope) -> Target? {
         if
             scope.contains(.receiver),
             let target = receiverSelector(controller)

Sources/IntrospectionView.swift

@@ -4,7 +4,7 @@ import SwiftUI
 typealias IntrospectionViewID = UUID
 
 fileprivate enum IntrospectionStore {
-    static var shared: [IntrospectionViewID: Pair] = [:]
+    @MainActor static var shared: [IntrospectionViewID: Pair] = [:]
 
     struct Pair {
         weak var controller: IntrospectionPlatformViewController?
@@ -13,7 +13,7 @@ fileprivate enum IntrospectionStore {
 }
 
 extension PlatformEntity {
-    var introspectionAnchorEntity: Base? {
+    @MainActor var introspectionAnchorEntity: Base? {
         if let introspectionController = self as? IntrospectionPlatformViewController {
             return IntrospectionStore.shared[introspectionController.id]?.anchor~
         }

Sources/PlatformVersion.swift

@@ -2,13 +2,13 @@
 import Foundation
 
 @_spi(Internals)
-public enum PlatformVersionCondition {
+public enum PlatformVersionCondition: Sendable {
     case past
     case current
     case future
 }
 
-public protocol PlatformVersion {
+public protocol PlatformVersion: Sendable {
     @_spi(Internals)
     var condition: PlatformVersionCondition? { get }
 }

Sources/PlatformView.swift

@@ -19,6 +19,7 @@ typealias _PlatformViewControllerRepresentable = UIViewControllerRepresentable
 typealias _PlatformViewControllerRepresentable = NSViewControllerRepresentable
 #endif
 
+@MainActor
 protocol PlatformViewControllerRepresentable: _PlatformViewControllerRepresentable {
     #if canImport(UIKit)
     typealias ViewController = UIViewControllerType

Sources/PlatformViewVersion.swift

@@ -61,7 +61,7 @@ public typealias macOSViewVersion<SwiftUIViewType: IntrospectableViewType, Platf
 public typealias visionOSViewVersion<SwiftUIViewType: IntrospectableViewType, PlatformSpecificEntity: PlatformEntity> =
     PlatformViewVersion<visionOSVersion, SwiftUIViewType, PlatformSpecificEntity>
 
-public enum PlatformViewVersion<Version: PlatformVersion, SwiftUIViewType: IntrospectableViewType, PlatformSpecificEntity: PlatformEntity> {
+public enum PlatformViewVersion<Version: PlatformVersion, SwiftUIViewType: IntrospectableViewType, PlatformSpecificEntity: PlatformEntity>: Sendable {
     @_spi(Internals) case available(Version, IntrospectionSelector<PlatformSpecificEntity>?)
     @_spi(Internals) case unavailable
 
@@ -72,7 +72,7 @@ public enum PlatformViewVersion<Version: PlatformVersion, SwiftUIViewType: Intro
     @_spi(Advanced) public static func unavailable(file: StaticString = #file, line: UInt = #line) -> Self {
         let filePath = file.withUTF8Buffer { String(decoding: $0, as: UTF8.self) }
         let fileName = URL(fileURLWithPath: filePath).lastPathComponent
-        runtimeWarn(
+        print(
             """
             If you're seeing this, someone forgot to mark \(fileName):\(line) as unavailable.
 

Sources/RuntimeWarnings.swift

@@ -80,7 +80,7 @@ extension iOSViewVersion<FullScreenCoverType, UIPresentationController> {
     public static let v18 = Self(for: .v18, selector: selector)
 
     private static var selector: IntrospectionSelector<UIPresentationController> {
-        .from(UIViewController.self, selector: \.presentationController)
+        .from(UIViewController.self, selector: { $0.presentationController })
     }
 }
 
@@ -94,7 +94,7 @@ extension tvOSViewVersion<FullScreenCoverType, UIPresentationController> {
     public static let v18 = Self(for: .v18, selector: selector)
 
     private static var selector: IntrospectionSelector<UIPresentationController> {
-        .from(UIViewController.self, selector: \.presentationController)
+        .from(UIViewController.self, selector: { $0.presentationController })
     }
 }
 
@@ -103,7 +103,7 @@ extension visionOSViewVersion<FullScreenCoverType, UIPresentationController> {
     public static let v2 = Self(for: .v2, selector: selector)
 
     private static var selector: IntrospectionSelector<UIPresentationController> {
-        .from(UIViewController.self, selector: \.presentationController)
+        .from(UIViewController.self, selector: { $0.presentationController })
     }
 }
 #endif