Correct way to update MutableObservableArray2D from signals

[yhdzhang]

Hi all,

I have declared a MutableObservableArray2D as a property in my class which is used as a CollectionView data source. I have multiple signals which generate section data for my CollectionView data source. What is the correct way to update MutableObservableArray2D ?
I have been doing it like below in my project, but i'm starting to have weird timing issues.

let sections = MutableObservableArray2D(Array2D<String, String>(sectionsWithItems: [
    ("foo", []),
    ("bar", []),
]))

func start() {
    SafeSignal<String>(just: "foo").observeNext { string in
        self.sections.replaceItems(ofSectionAt: 0, with: [string], performDiff: false)
    }
    .dispose(in: bag)

    SafeSignal<String>(just: "bar").observeNext { string in
        self.sections.replaceItems(ofSectionAt: 1, with: [string], performDiff: false)
    }
    .dispose(in: bag)
}