Communication with child view controller
jjochen opened this issue · comments
Hello,
I can't wrap my head around how to communicate with a child view controller.
I have one trigger from the ParentViewController
that is needed in the ChildViewModel
and a second one from the ChildViewModel
that should trigger some UI changes in the ParentViewController
:
trigger1: ParentViewController (input)> ... (no idea)> ChildViewModel
trigger2: ChildViewModel (output)> ... (no idea)> ParentViewController
My code currently looks something like this:
final class ParentViewController: UIViewController {
var viewModel: ParentViewModel?
private let disposeBag = DisposeBag()
override func viewDidLoad() {
super.viewDidLoad()
bindViewModel()
}
private func bindViewModel() {
guard let viewModel = self.viewModel else {
fatalError("View Model not set!")
}
let triggerToChild = rx.someTrigger
let input = ParentViewModel.Input(triggerToChild: triggerToChild)
let output = viewModel.transform(input: input)
output.triggerFromChild
.drive(rx.someProperty)
.disposed(by: disposeBag)
}
}
final class ParentViewModel: ViewModelType {
struct Input {
let triggerToChild: Driver<Void>
}
struct Output {
let triggerFromChild: Driver<Void>
}
func transform(input: Input) -> Output {
let triggerFromChild = ??? <===================
return Output(triggerFromChild: triggerFromChild)
}
}
final class ChildViewController: UIViewController {
var viewModel: ChildViewModel?
private let disposeBag = DisposeBag()
override func viewDidLoad() {
super.viewDidLoad()
bindViewModel()
}
private func bindViewModel() {
guard let viewModel = self.viewModel else {
fatalError("View Model not set!")
}
let triggerFromParent = ??? <===================
let input = ChildViewModel.Input(triggerFromParent: triggerFromParent)
let output = viewModel.transform(input: input)
output.triggerFromParent
.drive(rx.someProperty)
.disposed(by: disposeBag)
}
}
final class ChildViewModel: ViewModelType {
struct Input {
let triggerFromParent: Driver<Void>
}
struct Output {
let triggerToParent: Driver<Void>
}
func transform(input: Input) -> Output {
let triggerToParent = rx.someTrigger
return Output(triggerToParent: triggerToParent)
}
}
Maybe someone could point me in the right direction? Thank You!
I had the exact same thought 🤔 how does this ViewModalType work in that scenario?
This article helps:
https://medium.com/blablacar-tech/rxswift-mvvm-66827b8b3f10