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import UIKit

class FourColumnsContainerViewController: UIViewController {
    let outerSplitViewController = UISplitViewController(style: .tripleColumn)
    let innerSplitViewController = UISplitViewController(style: .doubleColumn)

    let primary = makeContentViewController("App")
    let secondary = makeContentViewController("Files")
    let mainContent = makeContentViewController("File Content")
    let inspector = makeContentViewController("Inspector")

alemar11

CFRunLoopSource is cool. It lets you build behavior similar to the mechanisms that drive setNeedsLayout and setNeedsDisplay in UIKit.

I found myself in need of something like this a couple of times. It's great to know that no matter how many times I say I need to update something, I will get a single callback at the end of the run loop that gives me a chance to perform my work.

Here is a little Swift wrapper that makes the API easier to deal with.

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//
//  ProgrammerAssertions.swift
//  Assertions
//
//  Created by Mohamed Afifi on 12/20/15.
//  Copyright © 2015 mohamede1945. All rights reserved.
//

import Foundation

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/// This is a list of Hypertext Transfer Protocol (HTTP) response status codes. 
/// It includes codes from IETF internet standards, other IETF RFCs, other specifications, and some additional commonly used codes.
/// The first digit of the status code specifies one of five classes of response; an HTTP client must recognise these five classes at a minimum.
enum HTTPStatusCode: Int, Error {
    
    /// The response class representation of status codes, these get grouped by their first digit.
    enum ResponseType {
        
        /// - informational: This class of status code indicates a provisional response, consisting only of the Status-Line and optional headers, and is terminated by an empty line.
        case informational

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// UICollectionView Objective-C example

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
        
    NSIndexPath *selectedIndexPath = [[self.collectionView indexPathsForSelectedItems] firstObject];
    if (selectedIndexPath != nil) {
        id<UIViewControllerTransitionCoordinator> coordinator = self.transitionCoordinator;
        if (coordinator != nil) {
            [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {

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import Foundation

final class TypingThrottler {
  typealias Handler = (String) -> Void
  let interval: TimeInterval
  let handler: Handler

  private var workItem: DispatchWorkItem?

  // handler will be called after the user has stopped typing for the given `interval` (seconds)

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// Run any SwiftUI view as a Mac app.

import Cocoa
import SwiftUI

NSApplication.shared.run {
    VStack {
        Text("Hello, World")
        	.padding()
            .background(Capsule().fill(Color.blue))

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// a.swift
public dynamic func f() {
    print("original")
}

// b.swift
import a

@_dynamicReplacement(for: f())
public func f_b() {

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NSDate *date = [NSDate new];

NSDateFormatter *dateFormatter = [NSDateFormatter new];
dateFormatter.locale = [NSLocale localeWithLocaleIdentifier:@"nl_NL"];
dateFormatter.dateStyle = NSDateFormatterFullStyle;
dateFormatter.formattingContext = NSFormattingContextDynamic; // this is the important setting

NSString *dateString = [dateFormatter stringFromDate:date];

NSString *s1 = [NSString stringWithFormat:@"Foo %@", dateString]; // "Foo dinsdag 13 december 2016"

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import SwiftUI

struct SizeKey: PreferenceKey {
    static func reduce(value: inout CGSize?, nextValue: () -> CGSize?) {
        value = value ?? nextValue()
    }
}
struct ContentView: View {
    @State var width: CGFloat? = nil
    var body: some View {