Oni-zerone

public struct ViewRatio: Equatable {
    
    public var multiplier: CGFloat
    
    public var constant: CGFloat
}

public protocol GridDescriptor: GridItem {
    
    var ratio: ViewRatio { get }

Oni-zerone

public protocol ItemViewDescriptor {
    
    var reuseIdentifier: String { get }
}

public protocol ItemViewModel {
    
    var descriptor: ItemViewDescriptor { get set }
    
    var reuseIdentifier: String { get }

Oni-zerone

public protocol GridSection: SectionViewModel {
    
    var lineItems: Int? { get }
    
    var referenceItemWidth: CGFloat { get }
    
    var sectionInsets: UIEdgeInsets { get }
    
    var sectionHorizontalItemSpacing: CGFloat { get }
    

Oni-zerone

//The standard Interface to make requests and get AsyncContent
protocol RequestManager {
    
    func getContent(_ resourceId: Int, completion: @escaping (Resource.AsyncContent?, Error?) -> ())
}

//The concrete Implementation of the interface, this object is responsible to do the real Network request and parse the result.
struct APIRequestManager: RequestManager {
    

Oni-zerone

class ResourceCollectionViewCell: UICollectionViewCell {
    
    @IBOutlet weak var titleLabel: UILabel!
    
    @IBOutlet weak var descriptionLabel: UILabel!
    
    @IBOutlet weak var imageView: UIImageView!
}

extension ResourceCollectionViewCell: ResourceCell {

Oni-zerone

protocol ResourceCell {
    
    func setupResource(title: String)
    
    func setupResource(description: String)
    
    func setupResource(imageURL URL: URL)
}

Oni-zerone

protocol ResourceCell {
    
    func setupResource(title: String)
    
    func setupResource(description: String)
    
    func setupResource(imageURL URL: URL)
}

struct ResourceItemViewModel: ItemViewModel {

Oni-zerone

struct StandardCellViewModel: ItemViewModel {
    
    let title: String
    
    var reuseIdentifier: String {
        return "cell"
    }
    
    func setup(_ cell: UICollectionReusableView, in collectionView: UICollectionView, at indexPath: IndexPath) {
        guard let cell = cell as? StandardCell else {

Oni-zerone

class MVVMCollectionViewDataSource: NSObject, UICollectionViewDataSource {
    
    var model: [SectionViewModel] = []
    
    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return self.model.count
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return self.model[section].items.count

Oni-zerone

protocol ItemViewModel {
    
    var reuseIdentifier: String { get }
    
    func setup(_ cell: UICollectionReusableView, in collectionView: UICollectionView, at indexPath: IndexPath)
}

protocol SectionViewModel {
    
    var headerItem: ItemViewModel? { get }