RxSwift+Indicator.md

import UIKit
import RxSwift
import RxCocoa
import SVProgressHUD

final class ViewController: UIViewController {
    
    @IBOutlet weak private var button: UIButton!
    private var isShowIndicator = false
    
    private let disposeBag = DisposeBag()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        bind()
    }
    
    
    private func bind() {
        button.rx.tap
            .asSignal()
            .emit(onNext: { _ in
                self.isShowIndicator.toggle()
                self.rx.indicatior.onNext(self.isShowIndicator)
            })
            .disposed(by: disposeBag)
    }
}

extension Reactive where Base: UIViewController {
    var indicatior: Binder<Bool> {
        return Binder(self.base) { (_, value: Bool) in
            value ? SVProgressHUD.show() : SVProgressHUD.dismiss()
        }
    }
}