jeandavid

import UIKit

extension UIViewController {
    func add(_ child: UIViewController) {
        addChild(child)
        view.addSubview(child.view)
        child.didMove(toParent: self)
    }

    func remove() {

jeandavid

import UIKit

extension UIResponder {
    @objc 
    public var parentViewController: UIViewController? {
        return next as? UIViewController ?? next?.parentViewController
    }
}

jeandavid

import UIKit

// https://stackoverflow.com/a/50671026
extension UITextView {
    private class PlaceholderLabel: UILabel { }

    private var placeholderLabel: PlaceholderLabel {
        guard let label = subviews.first(where: { $0 is PlaceholderLabel }) as? PlaceholderLabel else {
            let label = PlaceholderLabel(frame: .zero)
            label.font = font

jeandavid

private class BundleFinder {}

public class MyView {
    let imageView = UIImageView()

    func setImage() {
        let frameworkBundle = Bundle(for: BundleFinder.self)
        let image = UIImage(named: "my_image", in: frameworkBundle, with: nil)
        imageView.image = image
    }

jeandavid

public class MyView {
    let imageView = UIImageView()
    
    func setImage() {
        let frameworkBundle = Bundle(identifier: "com.myframework")
        let image = UIImage(named: "my_image", in: frameworkBundle, with: nil)
        imageView.image = image
    }
}

jeandavid

import UIKit

/// A UILabel subclass that responds to links tap.
public class LinkableLabel: UILabel {

    // MARK: - Private
    
    private var touchedLink: URL?
    
    @objc

jeandavid

let syncOperation = SyncOperation()
let asyncOperation = AsyncOperation()
let queue = OperationQueue()
queue.addOperations([syncOperation, asyncOperation], waitUntilFinished: true)
print("Done")
// Outputs "Executing" twice then "Done"

jeandavid

let syncOperation = SyncOperation()
let asyncOperation = AsyncOperation()
let queue = OperationQueue()
queue.addOperation(syncOperation)
queue.addOperation(asyncOperation)

jeandavid

let first = BlockOperation {
  print("First")
}
let second = BlockOperation {
  print("Second")
}
first.start()
second.start()
print("Done")
// Output:

jeandavid

class AsyncOperation: Operation {
  // Only required when you want to manually start an operation
  // Ignored when an operation is added to a queue.
  override var isAsynchronous: Bool { return true }
  
  // This is not the OperationQueue!
  // This is the queue we use to read and write the operation state  in a safe thread way
  private let queue = DispatchQueue(label: "async_operation_private_queue", attributes: .concurrent)
  
  // State is accessed and modified in a thread safe and KVO   compliant way.