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  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))

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How to connect PS3 controller on Mac OSX, PC, etc.

This is how you connect PS3 controller to Mac OSX, PC, etc. when previously connected to a PS3. You will need a Mini USB cable. Overcome your laziness, get up of your chair, and go get one!

A big misconception is that keep holding PS button will reset the controller's pairing. It DOES NOT! From my testings, the controller keeps paring with the last machine it was CONNECTED VIA A USB CABLE.

Here are the steps:

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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: -

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import RxSwift // Version 3.2.0
import RxCocoa // Version 3.2.0

typealias KeyboardHeightInfo = (CGFloat, TimeInterval)

func keyboardHeight() -> Driver<KeyboardHeightInfo> {
  return Observable
    .from([
      NotificationCenter.default.rx.notification(NSNotification.Name.UIKeyboardWillShow)
        .map { notification -> KeyboardHeightInfo in

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    // Make subviews touchable even if it is outside its superview bounds.
    
    // ** Add more views here **
    lazy var touchableViews: [UIView] = {
        return [self.voteUpButton, self.voteDownButton, self.authorDetailButton]
    }()
    
    // Boilerplate
    override func hitTest(point: CGPoint, withEvent event: UIEvent?) -> UIView? {
        for view in touchableViews {

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import UIKit

/// A UITextView subclass with placeholder text support.
/// It uses another UILabel to show the placeholder, shown when text is empty.
class PlaceholderTextView: UITextView {

  lazy var placeholderLabel: UILabel = {
    let label = UILabel()
    label.textColor = UIColor(white: 0.5, alpha: 0.85)
    label.backgroundColor = .clear

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import UIKit

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

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  // 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

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  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))

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struct LossyArray<Element: Decodable>: Decodable {
  private(set) var elements: [Element]

  init(from decoder: Decoder) throws {
    var container = try decoder.unkeyedContainer()
    var elements = [Element]()

    if let count = container.count {
      elements.reserveCapacity(count)
    }