Making Api call on View DidLoad with MVVM swift - ios

Question

I have an application where I want to make an API call once the screen is awaken in the ViewController. Basically, I am using Universal Link to activate the ViewCOntroller and when it displays the UIViewController, I want to make an API call based on the Data got. I am currently using the MVVM Architecture and I have added my code below
My ViewModel
class EmailVerificationViewModel: ViewModel, ViewModelType {
struct Input {
let editEmailTrigger: Driver<Void>
}
struct Output {
}
let routeManager: BehaviorRelay<RouteMatchResult?>
let currentEmail: BehaviorRelay<String?>
init(routeManager: RouteMatchResult?, provider: Api, currentEmail: String?) {
self.routeManager = BehaviorRelay(value: routeManager)
self.currentEmail = BehaviorRelay(value: currentEmail)
super.init(provider: provider)
}
func transform(input: Input) -> Output {
// THE CALL I WANT TO MAKE
routeManager.errorOnNil().asObservable()
.flatMapLatest { (code) -> Observable<RxSwift.Event<User>> in
log("=========++++++++++++==========")
// guard let code = code else {return}
let params = code.values
let challengeId = Int(params["xxx"] as? String ?? "0")
let login = LoginResponseModel(identifier: params["xxxx"] as? String, key: params["xxxxxx"] as? String, oth: params["xxxxx"] as? String, id: 0, challengeId: challengeId)
return self.provider.postVerifyApp(challengeId: login.challengeId!, oth: login.oth!, identifier: login.identifier!)
.trackActivity(self.loading)
.trackError(self.error)
.materialize()
}.subscribe(onNext: { [weak self] (event) in
switch event {
case .next(let token):
log(token)
AuthManager.setToken(token: token)
// self?.tokenSaved.onNext(())
case .error(let error):
log(error.localizedDescription)
default: break
}
}).disposed(by: rx.disposeBag)
return Output()
}
}
My Viewcontroller
override func bindViewModel() {
super.bindViewModel()
guard let viewModel = viewModel as? EmailVerificationViewModel else { return }
let input = EmailVerificationViewModel.Input(editEmailTrigger: editEmailBtn.rx.tap.asDriver())
let output = viewModel.transform(input: input)
viewModel.loading.asObservable().bind(to: isLoading).disposed(by: rx.disposeBag)
viewModel.parsedError.asObservable().bind(to: error).disposed(by: rx.disposeBag)
isLoading.asDriver().drive(onNext: { [weak self] (isLoading) in
isLoading ? self?.startAnimating() : self?.stopAnimating()
}).disposed(by: rx.disposeBag)
error.subscribe(onNext: { [weak self] (error) in
var title = ""
var description = ""
let image = R.image.icon_toast_warning()
switch error {
case .serverError(let response):
title = response.message ?? ""
}
self?.view.makeToast(description, title: title, image: image)
}).disposed(by: rx.disposeBag)
}
so how can I make the call on the commented like THE CALL I WANT TO MAKE once the application catches the universal link and loads up. Basically making an API call on viewDidLoad

Answer 1

The code in your sample was way more than is needed to answer the question. Here is how you make a network call on viewDidLoad:
class ViewController: UIViewController {
var viewModel: ViewModel!
private let disposeBag = DisposeBag()
override func viewDidLoad() {
super.viewDidLoad()
let input = ViewModel.Input()
let output = viewModel.transform(input: input)
output.viewData
.bind(onNext: { viewData in
// setup the view with viewData
})
.disposed(by: disposeBag)
}
}
class ViewModel {
struct Input { }
struct Output {
let viewData: Observable<ViewData>
}
init(api: API) {
self.api = api
}
func transform(input: Input) -> Output {
let viewData = api.networkCall()
.map { ViewData(from: $0) }
return Output(viewData: viewData)
}
let api: API
}