ios – 在UICollectionViewCell中为UIButton设置rx.tap的问题 – RxSwift 3

我为1 UIButton订阅了2次：

>首次订阅,用于在每次点击时更新UI
>第二次订阅,用于在累积点击后每1秒更新一次Web服务上的值.

码：

class ProductionSize {
    var id : Int?
    var size: Int = 0
    var name: String = ""
}

class ProductionCell: UICollectionViewCell {
    var rxBag = DisposeBag()


    // this will be set in the (cellForItemAt indexPath: IndexPath) of collection view
    var productionSize: ProductionSize? {
        didSet {
            showProductionSize()
            prepareButton()
        }
    }

    func showProductionSize() {
        // ... code for showing ProductionSize in labels
    }

    func prepareButton() {
        // This for subscribing for every click for displaying purpose

        btn_increase.rx.tap
            .subscribe(){event in 
                self.increaseClicked() 
            }
            .addDisposableTo(rxBag)

        // this for subscribing for sending webservice request after 1 second of clicking the button (so that if user click it quickly i send only last request)

        btn_increase.rx.tap
            .debounce(1.0,scheduler: MainScheduler.instance)
            .subscribe(){ event in self.updateOnWS() }
            .addDisposableTo(rxBag)
    }

    func increaseClicked() {
        productionSize.size = productionSize.size + 1
        showProductionSize()
    }

    func updateOnWS() {
        // code for updating on webservice with Moya,RxSwift and Alamofire§
    }


    // when scrolling it gets called to dispose subscribtions
    override func prepareForReuse() {
        rxBag = DisposeBag()
    }

}

问题：

由于dispose发生在prepareForReuse()上,如果我多次单击该按钮并立即滚动,webservice调用将被处理掉而不会更新.

我试过的：

>将addDisposableTo(vc？.rx_disposableBag)添加到父ViewController DisposableBag.

问题,订阅累积和每次点击updateWS()多次调用,在每个滚动上订阅,从未处理.
>我试图从prepareForReuse()中删除disposableBag重新初始化.

问题是,每次点击都会调用对重复和累积的按钮的订阅以及许多webservice调用.

题：
如何让debounce订阅调到最后,并且从不重复多次订阅(如果是addDisposableTo viewController Bag)？

btn_increase.rx.tap
        .debounce(1.0,scheduler: MainScheduler.instance)
        .subscribe(){ event in self.updateOnWS() }
        .addDisposableTo(rxBag)

btn_increase.rx.tap
        .debounce(1.0,scheduler: MainScheduler.instance)
        .subscribe(onNext: { [weak self] (_ : Void) in
               self?.updateOnWS() 
        })
        .addDisposableTo(vc?.rxdisposableBag)