Control 이벤트에 sender 를 알게 한다.

Rx+Control.swift

//
//  Rx+Control.swift
//  ReactiveSample
//
//  Created by iamchiwon on 2018. 8. 1..
//  Copyright © 2018년 iamchiwon. All rights reserved.
//

import UIKit
import RxSwift
import RxCocoa

struct TargetedControlEvent<T> {
    var event: UIControlEvents
    var sender: T
}

extension Reactive where Base: UIControl {

    func controlEvent(event: UIControlEvents) -> Observable<TargetedControlEvent<Base>> {
        let targetedControlEvent = TargetedControlEvent(event: event, sender: base)
        return base.rx.controlEvent(event).map({ _ in targetedControlEvent })
    }

    func controlEvent(events: [UIControlEvents]) -> Observable<TargetedControlEvent<Base>> {
        return Observable.merge(events.map({ controlEvent(event: $0) }))
    }

    var allTouchEvents: Observable<TargetedControlEvent<Base>> {
        let touchEvents: [UIControlEvents] = [
                .touchDownRepeat,
                .touchDragInside,
                .touchDragOutside,
                .touchDragEnter,
                .touchDragExit,
                .touchUpInside,
                .touchUpOutside,
                .touchCancel
        ]
        return controlEvent(events: touchEvents)
    }

    var allEditingEvents: Observable<TargetedControlEvent<Base>> {
        let editingEvents: [UIControlEvents] = [
                .editingDidBegin,
                .editingChanged,
                .editingDidEnd,
                .editingDidEndOnExit
        ]
        return controlEvent(events: editingEvents)
    }

    var allEvents: Observable<TargetedControlEvent<Base>> {
        let events: [UIControlEvents] = [
                .valueChanged,
                .applicationReserved,
                .systemReserved
        ]

        var eventObservables = events.map({ controlEvent(event: $0) })
        eventObservables.append(contentsOf: [allTouchEvents, allEditingEvents])
        
        return Observable.merge(eventObservables)
    }

}

let disposeBag = DisposeBag()
let button = UIButton()

button.rx.controlEvent(event: .touchUpInside)
    .subscribe(onNext: { e in
        print("event : \(e.event)")
        print("sender : \(e.sender)")
    })
    .disposed(by: disposeBag)

    button.rx.allEvents
        .subscribe(onNext: { e in
            print("event : \(e.event)")
            print("sender : \(e.sender)")
        })
        .disposed(by: disposeBag)