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//
//  Activity.swift
//
//  Created by Zachary Waldowski on 8/21/16.
//  Copyright © 2016 Zachary Waldowski. Licensed under MIT.
//

import os.activity

private final class LegacyActivityContext {

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//
//  FacebookReactions.swift
//
//  Created by Fabio Giolito on 10/06/2019.
//  Follow me: https://twitter.com/fabiogiolito
//

import SwiftUI

struct FacebookReactions : View {

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//
//  InstaStories.swift
//  SwiftUITests
//
//  Created by Fabio Giolito on 23/06/2019.
//  Copyright © 2019 Fabio Giolito. All rights reserved.
//

import Combine
import SwiftUI

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public struct NilError: Error, CustomStringConvertible {

	let file: String

	let line: Int

	public init(file: String = #file, line: Int = #line) {
		self.file = file
		self.line = line
	}

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//
//  Switch.swift
//  Re-Engineering UISwitch
//
//  Created by Nathan Tannar on 15/12/18.
//  Copyright © 2018 Nathan Tannar. All rights reserved.
//

import UIKit

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import UIKit

/// A wrapper view controller that makes the horizontal size class
/// be based on both the Dynamic Text size and the width available.
class AdaptiveTraitsContainer: UIViewController {
    let wrappedViewController: UIViewController

    init(wrappedViewController: UIViewController) {
        self.wrappedViewController = wrappedViewController
        super.init(nibName: nil, bundle: nil)

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extension UIView {
    /// Example: call someView.nudge(0, 30)
    func nudge(_ dx: CGFloat, _ dy: CGFloat) {
        self.frame = self.frame.offsetBy(dx: dx, dy: dy)
        CATransaction.flush()
    }
}

extension UIView {
    /// Example: po UIView.root

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Hacking UIView animation blocks for fun and profit

In this article, I'm going to explore a way that we can create views that implement custom Core Animation property animations in a natural way.

As we know, layers in iOS come in two flavours: Backing layers and hosted layers. The only difference between them is that the view acts as the layer delegate for its backing layer, but not for any hosted sublayers.

In order to implement the UIView transactional animation blocks, UIView disables all animations by default and then re-enables them individually as required. It does this using the actionForLayer:forKey: method.

Somewhat strangely, UIView doesn't enable animations for every property that CALayer does by default. A notable example is the layer.contents property, which is animatable by default for a hosted layer, but cannot be animated using a UIView animation block.

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import Foundation

// Alternatives to `Scanner` (before: `NSScanner`).


// A scanner only needs a way to peek and to move to the next token.
protocol ScannerProtocol {
    associatedtype Token: Equatable
    var peek: Token? { get }
    mutating func moveToNextToken()

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// Douglas Hill, December 2018

import UIKit

/// A table view that allows navigation and selection using a hardware keyboard.
/// Only supports a single section.
class KeyboardTableView: UITableView {
    // These properties may be set or overridden to provide discoverability titles for key commands.
    var selectAboveDiscoverabilityTitle: String?
    var selectBelowDiscoverabilityTitle: String?