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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))

jamesrochabrun

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

jamesrochabrun

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  {

jamesrochabrun

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 }
        

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extension Optional {
    
    var isNil: Bool {
        return self == nil
    }
    
    var isNotNil: Bool {
        return self != nil
    }

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extension VNFaceObservation {
    
    static func overAllBoundingBoxFrom(boundingBoxes: [CGRect], tolerance: CGFloat) -> CGRect {
        
        /// Sort Max X coordinates
        let originXCoordinates = boundingBoxes.map { $0.minX }
        /// Sort Max Y coordinates
        let originYCoordinates = boundingBoxes.map { $0.minY }
        /// Find overall minX

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extension UICollectionView {
    
    func dynamicGrid(numbersOfSquares :Float) -> (rows: Float, columns: Float, cellSize: CGSize) {
        
        let ratio: Float = Float(self.frame.size.width / self.frame.size.height)
        
        let numberOfColumns = sqrt(numbersOfSquares * ratio)
        let numberOfRows = numbersOfSquares / numberOfColumns;
        
        // Find best option filling the whole height