출처 : https://stackoverflow.com/a/36839785

You may to use ActivityIndicator from RxSwift repo. I using MBProgressHUD in my project. At first you need to create extension for this library:

extension MBProgressHUD {

    /**
     Bindable sink for MBProgressHUD show/hide methods.
     */
    public var rx_mbprogresshud_animating: AnyObserver<Bool> {
        return AnyObserver { event in
            MainScheduler.ensureExecutingOnScheduler()

            switch (event) {
            case .Next(let value):
                if value {
                    let loadingNotification = MBProgressHUD.showHUDAddedTo(UIApplication.sharedApplication().keyWindow?.subviews.last, animated: true)
                    loadingNotification.mode = self.mode
                    loadingNotification.labelText = self.labelText
                    loadingNotification.dimBackground = self.dimBackground
                } else {
                    MBProgressHUD.hideHUDForView(UIApplication.sharedApplication().keyWindow?.subviews.last, animated: true)
                }
            case .Error(let error):
                let error = "Binding error to UI: \(error)"
                #if DEBUG
                    rxFatalError(error)
                #else
                    print(error)
                #endif
            case .Completed:
                break
            }
        }
    }
}

Next you need to create ActivityIndicator object in your ViewController class:

let progress = MBProgressHUD()
progress.mode = MBProgressHUDMode.Indeterminate
progress.labelText = "Loading..."
progress.dimBackground = true

let indicator = ActivityIndicator()
indicator.asObservable()
    .bindTo(progress.rx_mbprogresshud_animating)
    .addDisposableTo(bag)

Next just use trackActivity() function into your sequences:

apiMethod
.trackActivity(indicator)
.subscribeNext { stringArray in 
    items.value = stringArray
}
.addDisposableTo(bag)


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