rx.sentMessage(#selector(UIViewController.viewDidLoad)) 没有触发

Question

我有一个应用使用 RxSwift 跟随 MVVM。

ViewController


import UIKit
import RxSwift
import RxCocoa

final class ProfileViewController: BaseViewController<ProfileView> {

    var viewModel: Attachable<ProfileViewModel>!
    var bindings: ProfileViewModel.Bindings {

        let viewDidLoad = rx.sentMessage(#selector(UIViewController.viewDidLoad))
            .mapToVoid()
            .asDriverOnErrorJustComplete()

        let viewWillAppear = rx.sentMessage(#selector(UIViewController.viewWillAppear))
            .mapToVoid()
            .asDriverOnErrorJustComplete()

        let viewWillDisappear = rx.sentMessage(#selector(UIViewController.viewWillDisappear))
            .mapToVoid()
            .asDriverOnErrorJustComplete()

        let logout = navigationItem.rightBarButtonItem?.rx.tap
            .mapToVoid()
            .asDriverOnErrorJustComplete()

        return ProfileViewModel.Bindings(
            connectStore: viewWillAppear.asDriver(),
            disconnectStore: viewWillDisappear.asDriver(),
            fetchProfileByUserId: viewDidLoad.asDriver()
        )
    }

    private lazy var disposeBag = DisposeBag()

    override func viewDidLoad() {
        super.viewDidLoad()

        configureView()
    }


    private func configureView() {
        navigationItem.title = "Your account"
    }
}

extension ProfileViewController: ViewModelAttaching {
    func bind(viewModel: ProfileViewModel) -> ProfileViewModel {

        return viewModel
    }
}

ViewModel


import RxSwift
import RxCocoa
import ReSwift

final class ProfileViewModel: ViewModelType {

    typealias Dependency = HasReduxStore & HasImagePicker

    lazy var userID: String = __user__.id

    let data = PublishSubject<ProfileHeaderViewModel>()
    let endSession = PublishSubject<Void>()

    private let dependency: Dependency

    struct Bindings {
        let connectStore: Driver<Void>
        let disconnectStore: Driver<Void>
        let fetchProfileByUserId: Driver<Void>
    }

    private lazy var disposeBag = DisposeBag()

    init(dependency: Dependency, bindings: Bindings) {
        self.dependency = dependency

        bindings.connectStore
            .asObservable()
            .map { self }
            .bind(onNext: dependency.store.subscribe)
            .disposed(by: disposeBag)

        bindings.disconnectStore
            .asObservable()
            .map { self }
            .bind(onNext: dependency.store.unsubscribe)
            .disposed(by: disposeBag)

        bindings.fetchProfileByUserId
            .asObservable()
            .bind(onNext: dispatchFetchForProfileById)
            .disposed(by: disposeBag)
    }

    private func dispatchFetchForProfileById() {
        dependency.store.dispatch(FetchProfileByUserId(payload: userID))
    }
}

extension ProfileViewModel: StoreSubscriber {
    func newState(state: AppState) {

    }
}

当我的视图加载时，我希望 bindings.fetchProfileByUserId 被调用。然而什么也没有发生。我更新了我的绑定以在 viewWillAppear 上触发，一切都按预期工作。

我不知道为什么 viewDidLoad 在这种情况下不起作用。

Answer 1

您可以将 .debug() 添加到您的 viewDidLoad 链，以及将 print() 添加到 viewDidLoad 方法以查看到底发生了什么，但从外观上看，它似乎你在 viewDidLoad 之后设置你的绑定（也许在 configureView 中？）已经被解雇所以你永远不会得到任何额外的事件，这在视图控制器创建期间只发生一次并且会解释为什么 viewDidAppear 有效。

rx.sentMessage(#selector(UIViewController.viewDidLoad)) 没有触发

rx.sentMessage(#selector(UIViewController.viewDidLoad)) is not firing

mvvm

ios

reactive-cocoa

swift

rx-swift