값을 전달

// TabBarController
func setupBindings() {
    let HI = Observable
        .just(())
        .bind(to: viewModel.checkLocationAuth)
        .disposed(by: disposeBag)
}

값을 받고 바인딩 시작

• flatMap : 들어온 옵저버블과 다른 옵저버블 방출 가능

// TabBarViewModel
class TabBarViewModel: TabBarViewModelType {

    let disposeBag = DisposeBag()
    var checkLocationAuth: AnyObserver<Void>
    
    init(){
        let checkingAuth = PublishSubject<Void>()
        
        checkLocationAuth = checkingAuth.asObserver()
        
        checkingAuth
            .flatMap(LocationService.shared.requestLocation)
            .bind { print($0) }
            .disposed(by: disposeBag)
    }
    
}