A workaround for fixing SwiftUI’s list row highlighting behavior by preventing unwanted delays

SwiftUIListRowHighlightFix.swift

import InterposeKit
import SwiftUI

/// A workaround for an issue in SwiftUI related to delayed highlighting of list rows upon user
/// interaction, rendering it inconsistent with UIKit.
///
/// This fix implements the solution proposed by Léo Natan and utilizes `InterposeKit` by Peter
/// Steinberger to modify the behavior of `UICollectionViewCell` instances used internally
/// by SwiftUI.
///
/// Please be aware that this patch uses private API and might lead to rejections when used
/// in production on the App Store.
///
/// ### Usage
///
/// ```
/// @main
/// internal struct MyApp: App {
///     internal var body: some Scene {
///         WindowGroup {
///             MyView()
///                 .onAppear { 
///                     SwiftUIListRowHighlightFix.apply()
///                 }
///         }
///     }
/// }
/// ```
///
/// ### Further Resources
///
/// - [The actual workaround shared by Léo Natan](https://twitter.com/LeoNatan/status/1709222793672347809)
/// - Lukas Petr’s reports of this issue on [Mastodon](https://mastodon.social/@luksape/111141902041183627)
///   and [Twitter](https://twitter.com/luksape/status/1707113201656115342)
public enum SwiftUIListRowHighlightFix {
    public static func apply() {
        do {
            _ = try Interpose(UICollectionViewCell.self) {
                try $0.prepareHook(
                    Selector(("_setHighlighted:animated:")),
                    methodSignature: (@convention(c) (UICollectionViewCell, Selector, Bool, Bool) -> Void).self,
                    hookSignature: (@convention(block) (UICollectionViewCell, Bool, Bool) -> Void).self
                ) { hook in
                    return { `self`, highlighted, animated in
                        var animated = animated
                        
                        if NSStringFromClass(type(of: self)).hasPrefix("SwiftUI.") {
                            animated = true
                        }
                        
                        hook.original(self, hook.selector, highlighted, animated)
                    }
                }
            }
        } catch {
            assertionFailure(
                """
                \(SwiftUIListRowHighlightFix.self): Unable to apply fix for SwiftUI’s list row
                highlight behavior.
                """
            )
        }
    }
}