Using UIViewController via the SwiftUI Environment

UIViewController+SwiftUI.swift

struct ViewControllerHolder {
	weak var value: UIViewController?
	init(_ value: UIViewController?) {
		self.value = value
	}
}

struct ViewControllerKey: EnvironmentKey {
	static var defaultValue: ViewControllerHolder { return ViewControllerHolder(UIApplication.shared.windows.first?.rootViewController ) }
}

extension EnvironmentValues {
	var viewController: ViewControllerHolder {
		get { return self[ViewControllerKey.self] }
		set { self[ViewControllerKey.self] = newValue }
	}
}

extension UIViewController {
	func present<Content: View>(presentationStyle: UIModalPresentationStyle = .automatic, transitionStyle: UIModalTransitionStyle = .coverVertical, animated: Bool = true, completion: @escaping () -> Void = {}, @ViewBuilder builder: () -> Content) {
		let toPresent = UIHostingController(rootView: AnyView(EmptyView()))
		toPresent.modalPresentationStyle = presentationStyle
		toPresent.rootView = AnyView(
			builder()
				.environment(\.viewController, ViewControllerHolder(toPresent))
		)
		if presentationStyle == .overCurrentContext {
			toPresent.view.backgroundColor = .clear
		}
		self.present(toPresent, animated: animated, completion: completion)
	}
}

Using UIViewControllerRepresentable to manage the make/update lifetime will fix the leak.