hlung

import Cocoa
import CoreImage
import CoreImage.CIFilterBuiltins

let nextButtonImage = NSImage(named: "next button")!
let startGameButtonImage = NSImage(named: "start game button")!

computeImageDifference(inputImage: nextButtonImage, inputImage2: startGameButtonImage)

// MARK: -

hlung

import UIKit

class MyViewController: UIViewController {
  var name: String = "" {
    didSet {
      print("name = \(name)")
      testLabel.text = name // 2
    }
  }

hlung

  // Put this in a UITableViewCell or UICollectionViewCell subclass.
  // Returns nil if point is not within the specified subviews.
  override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
    let subviews = [imageView, titleLabel, detailLabel, downloadButton]
    for view in subviews {
      if view.convert(view.bounds, to: self).contains(point) {
        return super.hitTest(point, with: event)
      }
    }
    return nil

hlung

  let layout = UICollectionViewCompositionalLayout(sectionProvider: {
    (sectionIndex: Int, layoutEnvironment: NSCollectionLayoutEnvironment) -> NSCollectionLayoutSection? in

    let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0),
                                          heightDimension: .estimated(30))
    let item = NSCollectionLayoutItem(layoutSize: itemSize)

    let groupSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0),
                                           heightDimension: .estimated(30))

hlung

  let layout = UICollectionViewCompositionalLayout(sectionProvider: {
    (sectionIndex: Int, layoutEnvironment: NSCollectionLayoutEnvironment) -> NSCollectionLayoutSection? in

    let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0),
                                          heightDimension: .fractionalHeight(1.0))
    let item = NSCollectionLayoutItem(layoutSize: itemSize)

    // (1) setting widthDimension to half of collectionView size
    let groupSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(0.5),
                                           heightDimension: .absolute(50))

hlung

import Foundation

class APIClient {

  // 1 - Error enum
  enum APIClientError: Error {
    case dataTaskFailed(Error)
    case noHTTPURLResponse
    case badHTTPStatusCode(HTTPURLResponse)
    case noData

hlung

import Foundation
import UIKit

// From an example view hierarchy...
// 1 -> 2 -> 3 -> 4 -> 5
//      |
//      ---> 6
// Find the least common ancestor of 2 views.

// Input

hlung

find /Applications -name "*.app" -user old-user -maxdepth 1 | tr \\n \\0 | xargs -0 sudo chown -R $USER

hlung

import Foundation

// Allows defining CodingKey from String
struct DynamicCodingKey: CodingKey {
  var intValue: Int?
  var stringValue: String

  init?(intValue: Int) {
    assertionFailure("Not implemented")
    return nil

hlung

import Foundation

public extension Array {
  // Iterate through all elements in pair tuples
  // e.g. [1, 2, 3, 4].allPairs = [(1, 2), (2, 3), (3, 4)]
  var allPairs: [(Element, Element)] {
    var array: [(Element, Element)] = []
    for i in 0..<self.count - 1 {
      array.append((self[i], self[i+1]))
    }