Supports handling of events on a UIControl using Combine framework

UIControl+EventPublisher.swift

extension UIControl {
    struct EventPublisher: Publisher {
        typealias Output = Void
        typealias Failure = Never
        
        fileprivate var control: UIControl
        fileprivate var event: Event
        
        func receive<S: Subscriber>(subscriber: S) where S.Input == Output, S.Failure == Failure {
            let subscription = EventSubscription<S>()
            subscription.target = subscriber
            subscriber.receive(subscription: subscription)
            control.addTarget(subscription, action: #selector(subscription.trigger), for: event)
        }
    }
    
    class EventSubscription<S: Subscriber>: Subscription where S.Input == Void {
        var target: S?
        func request(_ demand: Subscribers.Demand) {}
        
        func cancel() {
            target = nil
        }
        
        @objc func trigger() {
            _ = target?.receive(())
        }
    }
    
    func publisher(for event: Event) -> EventPublisher {
        EventPublisher(control: self, event: event)
    }
}