Czajnikowski

extension ShoppingListDataSource: UITableViewDataSource {
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(for: indexPath)
        
        if indexPath.row == 0 {
            cell.prepare(withListTitle: "Lista zakupów")
        }
        else {
            if advertsEnabled {
                if advertIndexes.contains(indexPath.row - 1) {

Czajnikowski

extension ShoppingListDataSource: UITableViewDataSource {
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(for: indexPath)
        
        if indexPath.row == 0 {
            cell.prepare(withListTitle: "Lista zakupów")
        }
        else {
            if advertIndexes.contains(indexPath.row - 1) {
                cell.prepare(withAdvert: "Reklama")

Czajnikowski

extension ShoppingListDataSource: UITableViewDataSource {
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(for: indexPath)
        
        if indexPath.row == 0 {
            cell.prepare(withListTitle: "Lista zakupów")
        }
        else {
            cell.prepare(withShoppingItem: shoppingItems[indexPath.row - 1])
        }

Czajnikowski

extension ShoppingListDataSource: UITableViewDataSource {
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(for: indexPath)
        
        cell.prepare(withShoppingItem: shoppingItems[indexPath.row])
        
        return cell
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

Czajnikowski

import UIKit

class KeyboardHandler {
    private let bottomConstraint: NSLayoutConstraint
    private let animate: () -> Void
    
    init(
        withBottomConstraint bottomConstraint: NSLayoutConstraint,
        andAnimations animate: @escaping () -> Void
        ) {

Czajnikowski

func perform(wrappedAnimation: WrappedAnimation) {
  let animation = wrappedAnimation.unwrapped()    
  animation.perform() 
}

Czajnikowski

enum WrappedAnimation {
  case fromBottom
  case specific(Animation)
  
  func unwrapped() -> Animation {
    switch self {
      case .fromBottom:
        return createFromBottomAnimation()  //  Here is a meaning of the nil
      case .specific(let animation):
        return animation

Czajnikowski

object.show(withWrappedAnimation: .fromBottom)

Czajnikowski

enum WrappedAnimation {
  case fromBottom //  Anonymous nil before
  case specific(Animation)
}

Czajnikowski

object.show(withAnimation: nil)