在iOS上，对于MVVM中的DisposeBag，是否可以放在ViewModel中? [英] On iOS, for the DisposeBag in MVVM, can it be placed in ViewModel?

问题描述

我是 RxSwift 的新手，在这里我想问一个关于 DisposeBag 应该放在哪里的问题.

I am new to RxSwift and here I would like to ask a question about where should the DisposeBag be.

我的情况是，我检索了一个在 tableview 中显示的项目列表，每个项目都有自己的标志来指示它是否被选中.

My case is, I have retrieve a list of items being displayed in a tableview, and each of them will have its own flag to indicate if it is selected.

所以我不只是将结果列表绑定到 tableview.我需要一些逻辑来在用户通过 tableview 导航时在本地编辑列表.

So I am not just binding the result list to the tableview. I need to have some logic which editing the list on local while user navigate via the tableview.

我在 ViewModel 中创建了一个实例 Variable([Item]) 但是如果我将逻辑放在 ViewModel 中，则 >DisposeBag 是必需的.

I have created an instance Variable([Item]) in the ViewModel but if I place the logic in the ViewModel a DisposeBag is needed.

经过一些谷歌搜索后，大多数具有 Variable 实例的 MVVM+RxSwift 示例将 DisposeBag 放在 ViewModel 中，但有人说它应该只放在 ViewController 中.真的吗?如何在 ViewModel 中监听 Observable 以便我的业务逻辑可以放在 ViewModel 中?

After having some googling, most of the examples of MVVM+RxSwift which have instances of Variable place the DisposeBag in ViewModel but some say it should only be placed in ViewController. Is that true? How can I listen the Observable in ViewModel so that my business logic can be placed in ViewModel?

推荐答案

DisposeBag 通常应该不放在 ViewModel 中，除非有充分的理由.

A DisposeBag more often than not should not be placed in a ViewModel unless there's a good reason.

通常，DisposeBag 旨在将订阅与其所有者联系起来.通常情况下，ViewModel 不会创建任何订阅，而只是提供 Observable 以便消费者可以订阅它们(例如 ViewController).

In general a DisposeBag is meant to tie subscriptions to their owner. It is usually not the case that the ViewModel creates any subscriptions, but merely provides Observables so a consumer could subscribe to them (for example a ViewController).

这意味着 ViewController 通常是保存 DisposeBag 的控制器，因为它通常是使用订阅的控制器(而不是 ViewModel 本身).

That means the ViewController is the one to usually hold the DisposeBag, as its usually the one that uses the subscriptions (and not the ViewModel itself).

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