Replace RSCore with several local modules. Update code as needed.

UIKitExtras/Sources/UIKitExtras/UIResponder+RSCore.swift

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+//
+//  UIResponder+.swift
+//  RSCore
+//
+//  Created by Maurice Parker on 11/17/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+#if os(iOS)
+import UIKit
+
+extension UIResponder {
+	
+	private weak static var _currentFirstResponder: UIResponder? = nil
+
+	public static var isFirstResponderTextField: Bool {
+		var isTextField = false
+		if let firstResponder = UIResponder.currentFirstResponder {
+			isTextField = firstResponder.isKind(of: UITextField.self) || firstResponder.isKind(of: UITextView.self) || firstResponder.isKind(of: UISearchBar.self)
+		}
+
+		return isTextField
+	}
+
+	public static var currentFirstResponder: UIResponder? {
+		UIResponder._currentFirstResponder = nil
+		UIApplication.shared.sendAction(#selector(findFirstResponder(sender:)), to: nil, from: nil, for: nil)
+		return UIResponder._currentFirstResponder
+	}
+	
+	public static func resignCurrentFirstResponder() {
+		if let responder = currentFirstResponder {
+			responder.resignFirstResponder()
+		}
+	}
+
+	@objc internal func findFirstResponder(sender: AnyObject) {
+		UIResponder._currentFirstResponder = self
+	}
+	
+}
+#endif

UIKitExtras/Sources/UIKitExtras/UIView+RSCore.swift

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+//
+//  UIView-Extensions.swift
+//  RSCore
+//
+//  Created by Maurice Parker on 4/20/19.
+//  Copyright © 2019 Ranchero Software, LLC. All rights reserved.
+//
+
+#if os(iOS)
+import UIKit
+
+extension UIView {
+	
+	public func setFrameIfNotEqual(_ rect: CGRect) {
+		if !self.frame.equalTo(rect) {
+			self.frame = rect
+		}
+	}
+	
+	public func addChildAndPin(_ view: UIView) {
+		view.translatesAutoresizingMaskIntoConstraints = false
+		addSubview(view)
+		
+		NSLayoutConstraint.activate([
+			safeAreaLayoutGuide.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+			safeAreaLayoutGuide.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+			safeAreaLayoutGuide.topAnchor.constraint(equalTo: view.topAnchor),
+			safeAreaLayoutGuide.bottomAnchor.constraint(equalTo: view.bottomAnchor)
+		])
+		
+	}
+	
+    public func asImage() -> UIImage {
+        let renderer = UIGraphicsImageRenderer(bounds: bounds)
+        return renderer.image { rendererContext in
+            layer.render(in: rendererContext.cgContext)
+        }
+    }
+	
+}
+#endif

UIKitExtras/Sources/UIKitExtras/UIViewController+RSCore.swift

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+//
+//  UIViewController-Extensions.swift
+//  NetNewsWire
+//
+//  Created by Maurice Parker on 4/15/19.
+//  Copyright © 2019 Ranchero Software. All rights reserved.
+//
+#if os(iOS)
+import UIKit
+import SwiftUI
+
+extension UIViewController {
+	
+	// MARK: Autolayout
+	
+	public func addChildAndPinView(_ controller: UIViewController) {
+		view.addChildAndPin(controller.view)
+		addChild(controller)
+	}
+	
+	public func replaceChildAndPinView(_ controller: UIViewController) {
+		view.subviews.forEach { $0.removeFromSuperview() }
+		children.forEach { $0.removeFromParent() }
+		addChildAndPinView(controller)
+	}
+	
+	// MARK: Error Handling
+	
+	public func presentError(title: String, message: String, dismiss: (() -> Void)? = nil) {
+		let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
+		let dismissTitle = NSLocalizedString("OK", comment: "OK")
+		let dismissAction = UIAlertAction(title: dismissTitle, style: .default) { _ in
+			dismiss?()
+		}
+		alertController.addAction(dismissAction)
+		self.present(alertController, animated: true, completion: nil)
+	}
+	
+}
+
+// MARK: SwiftUI
+
+public struct ViewControllerHolder {
+	public weak var value: UIViewController?
+}
+
+public struct ViewControllerKey: EnvironmentKey {
+	public static var defaultValue: ViewControllerHolder { return ViewControllerHolder(value: nil ) }
+}
+
+extension EnvironmentValues {
+	public var viewController: UIViewController? {
+		get { return self[ViewControllerKey.self].value }
+		set { self[ViewControllerKey.self].value = newValue }
+	}
+}
+
+extension UIViewController {
+	public func present<Content: View>(style: UIModalPresentationStyle = .automatic, @ViewBuilder builder: () -> Content) {
+		let controller = UIHostingController(rootView: AnyView(EmptyView()))
+		controller.modalPresentationStyle = style
+		controller.rootView = AnyView(
+			builder().environment(\.viewController, controller)
+		)
+		self.present(controller, animated: true, completion: nil)
+	}
+}
+#endif

UIKitExtras/Sources/UIKitExtras/UIWindow+RSCore.swift

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+//
+//  UIViewController+.swift
+//  NetNewsWire
+//
+//  Created by Maurice Parker on 4/15/19.
+//  Copyright © 2019 Ranchero Software. All rights reserved.
+//
+#if os(iOS)
+import UIKit
+
+extension UIWindow {
+	
+	public var topViewController: UIViewController? {
+		
+		var top = self.rootViewController
+		while true {
+			if let presented = top?.presentedViewController {
+				top = presented
+			} else if let nav = top as? UINavigationController {
+				top = nav.visibleViewController
+			} else if let tab = top as? UITabBarController {
+				top = tab.selectedViewController
+			} else if let split = top as? UISplitViewController {
+				switch split.displayMode {
+				case .allVisible:
+					top = split.viewControllers.first
+				case .primaryHidden:
+					top = split.viewControllers.last
+				default:
+					top = split.viewControllers.first
+				}
+			} else {
+				break
+			}
+		}
+		
+		return top
+		
+	}
+	
+}
+#endif