Czajnikowski

struct Example12: View {
    @State private var flag = false
    
    var body: some View {
        VStack {
            Spacer()
            Color.clear.overlay(WaveText("The SwiftUI Lab", waveWidth: 6, pct: flag ? 1.0 : 0.0).foregroundColor(.blue)).frame(height: 40)
            Color.clear.overlay(WaveText("swiftui-lab.com", waveWidth: 6, pct: flag ? 0.0 : 1.0, size: 18).foregroundColor(.green)).frame(height: 30)
            Spacer()
        }.onAppear {

Czajnikowski

ForEach(viewModel.repos) { repo in
    RepositoryRow(repo: repo)
        .onAppear(
            ofViewRelatedTo: repo,
            from: viewModel.repos,
            inSuffixOfLength: 10,
            perform: viewModel.fetchNextPageIfPossible
        )
}

Czajnikowski

final class ComposedViewController: UIViewController {
    ...
    
    private let specialization: Specialization
    
    init(specialization: Specialization) {
        self.specialization = specialization
    }
    
    ...

Czajnikowski

extension ViewController {
    final class Builder {
        static func buildView(somethingTextField: UITextField, printButton: UIButton) -> UIView {
            let view = UIView().forAutoLayout()
            view.backgroundColor = .white
            
            let stackView = buildRootStackView(somethingTextField: somethingTextField, printButton: printButton)
            view.addSubview(stackView)
            
            stackView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor, constant: 20.0).isActive = true

Czajnikowski

public final class LogInViewController: UIViewController {
    private let emailTextField: UITextField = Builder.buildEmailTextField()
    private let passwordTextField: UITextField = Builder.buildPasswordTextField()
    
    public override func loadView() {
        let logInButton: UIButton = Builder.buildLogInButton(
            target: self,
            action: #selector(didTapLogInButton)
        )
        

Czajnikowski

let peopleTableViewDataSource: UITableViewDataSource = HomogeneousTableViewDataSource<PersonCell, PersonCellState> {
    let person = people[$0.row]
    
    return PersonCellState(name: person.name, surname: person.surname)
}

Czajnikowski

class HomogeneousTableViewDataSource<Cell, CellState>: NSObject, UITableViewDataSource where
    Cell: UITableViewCell & Identifiable & PreparableWithState,
    CellState == Cell.State {

    typealias ProvideCellStateAtIndexPath = (IndexPath) -> CellState
    let provideCellStateAtIndexPath: ProvideCellStateAtIndexPath

    init(withCellStateAtIndexPathProvider provideCellStateAtIndexPath: @escaping ProvideCellStateAtIndexPath) {
        self.provideCellStateAtIndexPath = provideCellStateAtIndexPath
    }

Czajnikowski

struct PersonCellState {
    let name: String
    let surname: String
}

extension PersonCell: PreparableWithState {
    func prepare(with state: PersonCellState) {
        textLabel?.text = state.name
        detailTextLabel?.text = state.surname
    }

Czajnikowski

protocol PreparableWithState {
    associatedtype State
    
    func prepare(with state: State)
}

Czajnikowski

protocol Identifiable {
    static var identifier: String { get }
}