How to pass multiple parameters with using RxSwift?

Question

I did with below code for passing single parameter.

lazy var priceListData: Observable<FoodPrice> = {
        return self.foodNamesparams1.asObservable()
                   .flatMapLatest(ApiCallViewModel.foodList(_:))
}

But I don't know how to pass multiple parameters..
If I need to pass foodNamesparams1, foodNamesparams2 to ApiCallViewModel.foodList
How can I do it with RxSwift?

foodNamesparams1 and foodNamesparams2 both are BehaviorRelay

Answer 1

You most likely want to combine the parameters first, most likely via combineLatest or zip.

This will looks something like this

Observable.combineLatest(
    foodNamesparams1.asObservable(),
    foodNamesparams2.asObservable()
  )
  .flatMapLatest(ApiCallViewModel.foodList)

CombineLatest will not emit anything unless both combined observables have emitted at least once - and then it will commit on any update of either combined observable.

Check out the combining section here http://reactivex.io/documentation/operators.html#combining to find the best suited combination method