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Collor is a MVVM data-oriented framework for accelerating, simplifying and ensuring UICollectionView building.
Collor was created for and improved in the Voyages-sncf.com app.

Here is the list of all the features:

• Easy to use.
• A readable collectionView model.
• Architectured for reusing cell.
• Protocol / Struct oriented.
• Scalable.
• Never use IndexPath.
• Never register a cell.
• Update the collectionView model easily.
• Diffing data or sections (by using Dwifft)
• Make easier building custom layout.
• Well tested.

• A medium article which explains the purpose and how to use Collor.

To run the example project, clone the repo, and run pod install from the Example directory first.
There are 4 examples:

• Menu : Simple collectionView with userEvent propagation example
• Random : Diffing entire data + custom layout
• Weather : Diffing sections + custom layout
• Pantone : Adding and remove items using CollectionDatas.

The UICollectionView is represented by a collectionData object which contains sectionDescriptors which contain themself cellDescriptors. Each item or cell in Collor is composed by 3 objects:

• The UICollectionViewCell (XIB + swift file) which implements CollectionCellAdaptable
• A cellDescriptor which implements CollectionCellDescribable
• An adapter (view model) which implements CollectionAdapter

It describes the cell and is the link between the cell and the viewModel. Logically, one type of cell needs only one cellDescriptor. It owns the cell identifier, the cell className and handles the size of the cell. The collectionData handles cell registering and dequeuing using these properties.

final class WeatherDayDescriptor: CollectionCellDescribable {

    let identifier: String = "WeatherDayCollectionViewCell"
    let className: String = "WeatherDayCollectionViewCell"
    var selectable:Bool = false

    let adapter: WeatherDayAdapter

    init(adapter:WeatherDayAdapter) {
        self.adapter = adapter
    }

    func size(_ collectionView: UICollectionView, sectionDescriptor: CollectionSectionDescribable) -> CGSize {
        let sectionInset = sectionDescriptor.sectionInset(collectionView)
        let width:CGFloat = collectionView.bounds.width - sectionInset.left - sectionInset.right
        return CGSize(width:width, height:60)
    }

    public func getAdapter() -> CollectionAdapter {
        return adapter
    }
}

An adapter is a viewModel object. It transforms your model in a human readable data used by the cell.

struct WeatherDayAdapter: CollectionAdapter {

    let date:NSAttributedString

    static let dateFormatter:DateFormatter = {
        let df = DateFormatter()
        df.dateFormat = "EEEE d MMMM"
        return df
    }()

    init(day:WeatherDay) {

        let dateString = WeatherDayAdapter.dateFormatter.string(from: day.date)
        date = NSAttributedString(string: dateString, attributes: [
            NSFontAttributeName: UIFont.boldSystemFont(ofSize: 18),
            NSForegroundColorAttributeName: UIColor.black
        ])
    }
}

When a cell is dequeued, the collectionData updates the cell with this object.

final class WeatherDayCollectionViewCell: UICollectionViewCell, CollectionCellAdaptable {
  @IBOutlet weak var label: UILabel!

  func update(with adapter: CollectionAdapter) {
        guard let adapter = adapter as? WeatherDayAdapter else {
            fatalError("WeatherDayAdapter required")
        }
        label.attributedText = adapter.date
    }
}

Create the dataSource and the delegate:

lazy var collectionViewDelegate: CollectionDelegate = CollectionDelegate(delegate: self)
lazy var collectionViewDatasource: CollectionDataSource = CollectionDataSource(delegate: self)

Create the collectionData:

let collectionData = MyCollectionData()

Bind the collectionView with the data, the datasource and the delegate:

bind(collectionView: collectionView, with: collectionData, and: collectionViewDelegate, and: collectionViewDatasource)

Create a section and one cell in the collectionData:

final class MyCollectionData : CollectionData {

    override func reloadData() {
        super.reloadData()

        let section = MySectionDescriptor().reloadSection { (cells) in
                let cell = MyColorDescriptor(adapter: MyColorAdapter(model: "someThing"))
                cells.append(cell)
            })
        }
        sections.append(section)
    }
}

MySectionDescriptor:

final class MySectionDescriptor : CollectionSectionDescribable {

  func sectionInset(_ collectionView: UICollectionView) -> UIEdgeInsets {
      return UIEdgeInsets(top: 0, left: 10, bottom: 0, right: 10)
  }
}

You get a readable data which represents your UICollectionView, without code duplication, reusing cell and with a good separation of code.

Collor provides some features to easily update your collectionData.

Just append or remove cells or sections using CollectionData.update(_:) method. This means an end to fiddling around with IndexPath:

let newCellDescriptor = NewCellDescriptor(...)
let result = collectionData.update { updater in
    updater.append(cells: [newCellDescriptor], after: anotherCellDescriptor)
}
collectionView.performUpdates(with: result)

Here is the list of all update methods available:

• append(cells:after:)
• append(cells:before:)
• append(cells:in:)
• remove(cells:)
• reload(cells:)
• append(sections:after:)
• append(sections:before:)
• append(sections:)
• remove(sections:)
• reload(sections:)

Collor is using the great Dwifft library by Jack Flintermann for getting the "diff" between two updates of your collectionData.

• Diffing some sections:

sectionDescriptor.isExpanded = !sectionDescriptor.isExpanded
let result = collectionData.update{ updater in
    updater.diff(sections: [sectionDescriptor])
}
collectionView.performUpdates(with: result)

• Diffing entire data

model.someUpdates()
let result = collectionData.update { updater in
    collectionData.reload(model: model)
    updater.diff()
}
collectionView.performUpdates(with: result)

Collor is published with 3 xctemplates for helping you creating ViewController, SectionDescriptor and CellDescriptor.

To install them, just go in xctemplates directory and run this command in a terminal:

sh install.sh

• iOS 8.0+
• Swift 3.0+
• Xcode 8.0+

Collor is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod "Collor"

Collor doesn't yet support Carthage. Work in progress...

Documentation

Work in progress... 1% documented

Collor is owned and maintained by Voyages-sncf.com.

Collor was originally created by Gwenn Guihal.

Collor is available under the BSD license. See the LICENSE file for more info.