Micro ViewModel+View Recipe RxSwift

TestViewController.swift

class TestViewModel {
    struct Inputs {
        let tap = PublishSubject<Void>()
    }
    
    struct Outputs {
        let someString: Observable<String?>
    }
    
    let inputs: TestViewModel.Inputs
    let outputs: TestViewModel.Outputs
    
    init() {
        // Inputs
        inputs = Inputs()
        
        // Outputs
        let stringThing: Observable<String?> = inputs.tap.map { "Tapped!" }
        outputs = Outputs(someString: stringThing)
    }
}

class TestVC: UIViewController {
    @IBOutlet weak var button: UIButton!
    @IBOutlet weak var someLabel: UILabel!
    
    private let viewModel: TestViewModel
    private let disposeBag = DisposeBag()
    
    init(viewModel: TestViewModel) {
        self.viewModel = viewModel
        super.init(nibName: "TestVC", bundle: Bundle.main)
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // Bind Model Inputs
        button.rx.tap
            .bindTo(viewModel.inputs.tap)
            .addDisposableTo(disposeBag)
        
        // Bind Model Outputs
        viewModel.outputs.someString
            .bindTo(someLabel.rx.text)
            .addDisposableTo(disposeBag)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}