marcpalmer

extension StaticActionBinding where ActionType.PresenterType == NoPresenter {
    public func perform(with input: ActionType.InputType,
                        completion: ((ActionOutcome) -> ())? = nil) {
        …
    }
}

extension StaticActionBinding where ActionType.InputType == NoInput {
    public func perform(using presenter: ActionType.PresenterType,
                        completion: ((ActionOutcome) -> ())? = nil) {

marcpalmer

noInputAction.perform(using: somePresenter, with: .none)

noPresenterAction.perform(using: NoPresenter(), with: someInput)

noPresenterNoInputAction.perform(using: NoPresenter(), with: .none)

marcpalmer

final class BeepAction: Action {
    typealias InputType = NoInput
    typealias PresenterType = NoPresenter

    static func perform(with context: ActionContext<InputType>, using presenter: PresenterType, completion: ((ActionPerformOutcome) -> ())) {
        // … not important for this example
    }
}

marcpalmer

public struct StaticActionBinding<FeatureType, ActionType>: CustomDebugStringConvertible
        where FeatureType: FeatureDefinition, ActionType: Action {

    … 
    
    public func perform(using presenter: ActionType.PresenterType,
                        with input: ActionType.InputType,
                        completion: ((ActionOutcome) -> ())? = nil) {
        …
    }

marcpalmer

final class ShowMessageAction: Action {
    typealias InputType = String
    typealias PresenterType = MessagePresenter

    static func perform(with context: ActionContext<InputType>, using presenter: PresenterType, completion: ((ActionPerformOutcome) -> ())) {
        // … not important for this example
    }
}

marcpalmer

//: Playground - noun: a place where people can play

import UIKit

protocol Action {
    associatedtype Input
    associatedtype Presenter
    
    static func present(i: Input, p: Presenter)
}

marcpalmer

public class AppUISpec: UISpec {
    /// Define the grid point size
    public static let pointsPerGridUnit: CGFloat = 50.0

    /// Convenient type aliases so that UISpecs inheriting from
    /// this can use shorter forms.
    public typealias Dimension = GridDimension<AppUISpec>
    public typealias Radius = RadiusDimension<AppUISpec>

    /// Standard unit multiples we use throughout

marcpalmer

override func viewDidLoad() {
    super.viewDidLoad()

    // Normally views would take care of this themselves, not the view controller.
    // This is a just a quick example.
    OnboardingUISpec.Card.headingFont.apply(to: headingLabel)
    OnboardingUISpec.Card.bodyFont.apply(to: welcomeTextLabel)

    OnboardingUISpec.Card.backgroundColor.apply(to: [
        onboardingCardView,

marcpalmer

public class OnboardingUISpec: AppUISpec {
    public enum Card {
        public static let cornerRadius = 📏.smallRadius
        public static let backgroundColor = 🖍.cardBackground
        public static let padding = 📏.standardCardPadding

        public static let headingFont = 🔤.massiveMarketingHeading
        public static let bodyFont = 🔤.body
    }

marcpalmer

public typealias 🖍 = Colors
public typealias 📏 = Dimensions
public typealias 🔤 = Fonts