IGListKit/Examples/Examples-iOS/IGListKitExamples/ViewControllers/SelfSizingCellsViewController.swift

/**
 Copyright (c) 2016-present, Facebook, Inc. All rights reserved.

 The examples provided by Facebook are for non-commercial testing and evaluation
 purposes only. Facebook reserves all rights not expressly granted.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

import IGListKit
import UIKit

final class SelfSizingCellsViewController: UIViewController, ListAdapterDataSource {

    lazy var adapter: ListAdapter = {
        return ListAdapter(updater: ListAdapterUpdater(), viewController: self)
    }()
    let collectionView: UICollectionView = {
        let layout = UICollectionViewFlowLayout()
        layout.estimatedItemSize = CGSize(width: 100, height: 40)
        let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
        collectionView.backgroundColor = UIColor(red: 0.831_372_549, green: 0.945_098_039, blue: 0.964_705_882, alpha: 1)
        return collectionView
    }()

    let data = [
        SelectionModel(options: ["Leverage agile", "frameworks", "robust synopsis", "high level", "overviews",
                                 "Iterative approaches", "corporate strategy", "foster collaborative",
                                 "overall value", "proposition", "Organically grow", "holistic world view",
                                 "disruptive", "innovation", "workplace diversity", "empowerment"]),
        SelectionModel(options: ["Bring to the table", "win-win", "survival", "strategies", "proactive domination",
                                 "At the end of the day", "going forward", "a new normal", "evolved", "generation X",
                                 "runway heading", "streamlined", "cloud solution", "User generated", "content",
                                 "in real-time", "multiple touchpoints", "offshoring"], type: .nib),
        SelectionModel(options: ["Aenean lacinia bibendum nulla sed consectetur. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras mattis consectetur purus sit amet fermentum.",
                                 "Donec sed odio dui. Donec id elit non mi porta gravida at eget metus. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed posuere consectetur est at lobortis. Cras justo odio, dapibus ac facilisis in, egestas eget quam.",
                                 "Sed posuere consectetur est at lobortis. Nullam quis risus eget urna mollis ornare vel eu leo. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum."], type: .fullWidth)
    ]

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(collectionView)
        adapter.collectionView = collectionView
        adapter.dataSource = self
    }

    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        collectionView.frame = view.bounds
    }

    // MARK: ListAdapterDataSource

    func objects(for listAdapter: ListAdapter) -> [ListDiffable] {
        return data as [ListDiffable]
    }

    func listAdapter(_ listAdapter: ListAdapter, sectionControllerFor object: Any) -> ListSectionController {
        return SelfSizingSectionController()
    }

    func emptyView(for listAdapter: ListAdapter) -> UIView? { return nil }

}