이렇게 사용

• compactMap 쓰면 subscribe 할 때 파라미터가 옵셔널이 없어진다

viewModel.cinemaSchedule
    .observe(on: MainScheduler.instance)
    .compactMap { $0.first?.imageUrl }
    .flatMap { [weak self] urlString in
        self!.movieImageView.kf.rx.setImage(with: URL(string: urlString)!)
    }
    .subscribe { _ in
        print("Image Binding Completed")
    }
    .disposed(by: disposeBag)