A UIButton subclass that delivers its press events via an AsyncStream

AsyncButton.swift

import UIKit

class AsyncButton: UIButton {
    private var continuation: AsyncStream<Void>.Continuation?
    private(set) lazy var presses: AsyncStream<Void> = AsyncStream { continuation in
        configureContinuation(continuation)
    }

    deinit { continuation?.finish() }

    private func configureContinuation(_ continuation: AsyncStream<Void>.Continuation) {
        continuation.onTermination = { [weak self] _ in
            Task { @MainActor [weak self] in
                self?.continuation = nil
            }
        }

        self.continuation = continuation

        addTarget(self, action: #selector(handlePress), for: .touchUpInside)
    }

    @objc private func handlePress() {
        continuation?.yield()
    }
}