_dataSource.numberOfItems(in: section) always return zero

[steve21124]

Great library. thanks for sharing.
Not sure where I did the mistake. it always return zero when calling _dataSource.numberOfItems(in: section) . Basically, I am trying to see if DataSources will work without using RxSwift and RxCocoa. Since the demo only use (RxSwift and RxCocoa)

`
private lazy var _dataSource: DataSource = .init(adapter: .init(collectionView: self.collectionView))

private let section0 = Section(ModelA.self, isEqual: { $0.identity == $1.identity })

var section0Models: [ModelA] = [ModelA(identity: UUID().uuidString, title: String.randomEmoji())] {
    didSet {
        _dataSource.update(
            in: section0,
            items: section0Models,
            updateMode: .partial(animated: true),
            completion: {
                
        })
    }
}

    for _ in 0..<20 {
        _dataSource.add(section: section0)
    }
    for _ in 0..<20 {           
        section0Models.append(ModelA(identity: UUID().uuidString, title: String.randomEmoji()))
    }

// then calling this below always return zero. do you know why?
_dataSource.numberOfItems(in: 0)

`

[muukii]

@steve21124
Thank you.
I think you should not add section 20 times.

[muukii]

@steve21124
I've added validation.
94aba9b

Thank you!

[muukii]

@steve21124
And also, I've renamed few classes.
Please, check this PR.
#2

[steve21124]

Thank you for the help.
https://gist.github.com/steve21124/cf1a11e30b58e6957812fdbea583de01

I still have problem with this line
https://gist.github.com/steve21124/cf1a11e30b58e6957812fdbea583de01#file-viewcontroller-L48

It return zero items. Do you have simple example without using "RxSwift and RxCocoa" ?

[muukii]

@steve21124
Hi, Thank you for sample code.

I've fixed your code. please check it.
https://gist.github.com/muukii/dac32876237c127cbfa4fc0257905686

And sorry.
Calling update will be throttled, therefore updating numberOfItems will be updated asynchronously.

You can get an actual count of data in update.completion closure.

[steve21124]

Thank you so much for the fixes. Now it make sense. It take a while to debug it. :)

With this sample code, I now know, it will work without using "RxSwift and RxCocoa" .

[steve21124]

fyi: currently, i am planning to remove "import RxSwift, EasyPeasy, AsyncDisplayKit" dependencies of Component.swift the reason because I am using ios 11 beta 5 and these libraries is not compatible yet with swift 4.0. If you do have solution for it. feel free to share it. Thank you