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    /// 1
    lazy var displayModeCustomButton: Button = {
        let button = Button(type: .system, image: SplitViewControllerViewModel.displayModeButtonImageFor(self.displayMode), target: self, selector: #selector(togglePrefferDisplayModeExecutingCompletion))
        button.constrainWidth(constant: 44.0)
        button.constrainHeight(constant: 44.0)
        button.imageEdgeInsets = .init(top: 8.0, left: 8.0, bottom: 8.0, right: 8.0)
        return button
    }()

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// In UserProfileViewController (the master) we need:

// 1
protocol UserProfileFeedSelectionDelegate: AnyObject {
    func postSelectedAt(_ indexPath: IndexPath)
}
// 2
weak var delegate: UserProfileFeedSelectionDelegate?
// 3
lazy private var contentDetailViewController: ContentDetailViewcontroller = {

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/// 1 convenience init.
    convenience init(viewControllers: [UIViewController]) {
        self.init()
      /// 2 set master and detail, it takes an array of view controllers.
        self.viewControllers = viewControllers
      /// 3 preferredDisplayMode, it defines the display mode of the split view controller,
      /// .allVisible will display both master and detail.
        preferredDisplayMode = .allVisible            
      /// set the delegate to self to allow the `SplitViewController` handle the UISplitViewControllerDelegate methods.
        super.delegate = self

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class TabBarController: UITabBarController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
      /// 1 - Set view Controllers using `TabBarViewModel`
      /// 2 - This iteration will create a master veiw controller embedded in a navigation controller for each tab.
      /// 3 - `inSplitViewControllerIfSupported` is a `UINavigationController` extension method that will embed it in a `UISplitViewController` if supported. 
      /// we will see the implementation later.
        viewControllers = TabBarViewModel.allCases.map { NavigationController(rootViewController: $0.masterViewController).inSplitViewControllerIfSupported(for: $0) }
    }

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    override func scrollViewDidScroll(_ scrollView: UIScrollView) {
        
        let safeAreaTop = UIApplication.shared.windows.filter { $0.isKeyWindow }.first?.safeAreaInsets.top ?? 0
        let navigationNeededOfset: CGFloat = safeAreaTop// + (navigationController?.navigationBar.frame.height ?? 0)
        let offset = scrollView.contentOffset.y + navigationNeededOfset
        let alpha = 1 - ((scrollView.contentOffset.y + navigationNeededOfset) / navigationNeededOfset)
        
        // Use the alpha here
        navigationController?.navigationBar.backgroundColor = .blue
        navigationController?.navigationBar.transform = .init(translationX: 0, y: min(0, -offset))

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class AbsoluteFrameAnimator: NSObject {
    
    private var absoluteFrame: CGRect = CGRect.zero
    
    init(duration: CGFloat) {
        self.duration = duration
    }
    
    private let duration: CGFloat

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protocol CollectionReusable {}


/// Disclaimer: From Apple UI engineer - its allow to force cast the cell in this method, if it fails its mostly another issue in the implementation.



/// MARK:- UITableView

extension CollectionReusable where Self: UITableViewCell  {

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import UIKit

// Helpers

// takes a list and checks if a given predicate is true for every element O(n)
func all<T>(_ xs: [T], predicate: (T) -> Bool) -> Bool {
    for x in xs {
        if !predicate(x) {
            return false
        }

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    func convert(_ textValue: String) -> Int{
        
        var total = 0
        var valueMap = [
            "1" as Character: 1,
            "2": 2,
            "3": 3,
            "4": 4,
            "5": 5,
            "6": 6,

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    func fadeHorizontalEdges(in collectionView: UICollectionView, modifier: CGFloat) {
        
        let visibleCells = collectionView.visibleCells
        guard !visibleCells.isEmpty else { return }
        
        let firstCell = visibleCells.first!
        let lastCell = visibleCells.last!
        
        visibleCells.forEach { $0.alpha = 1 }