Mark Leonard markcleonard

Automatic build versions from git in Xcode (and other goodies)

Installation procedure for pre-build actions to automatically populate Xcode Info.plist with dynamic data.

1. Xcode Scheme pre-action

Edit Xcode Scheme and add a pre-action script. Copy the contents of preaction.sh into the pre-action script box.

1. The Layer Tree

Core Animation's original name is Layer Kit

Core Animation is a compositing engine; its job is to compose different pieces of visual content on the screen, and to do so as fast as possible. The content in question is divided into individual layers stored in a hierarchy known as the layer tree. This tree forms the underpinning for all of UIKit, and for everything that you see on the screen in an iOS application.

In UIView, tasks such as rendering, layout and animation are all managed by a Core Animation class called CALayer. The only major feature of UIView that isn’t handled by CALayer is user interaction.

There are four hierarchies, each performing a different role:

	enum PresentedSheet: String, Identifiable {
	case sticky, standard

	var id: String {
	return self.rawValue
	}
	}

	extension String: Identifiable {
	public var id: String {

	// Copyright © 2019 Alexey Naumov. MIT License

	import Combine

	typealias CancelBag = Set<AnyCancellable>

	extension CancelBag {
	mutating func collect(@Builder _ cancellables: () -> [AnyCancellable]) {
	formUnion(cancellables())
	}

	//
	// Combine+WithLatestFrom.swift
	//
	// Created by Shai Mishali on 29/08/2019.
	// Copyright © 2019 Shai Mishali. All rights reserved.
	//

	import Combine

	// MARK: - Operator methods

	// The MIT License (MIT)
	//
	// Copyright (c) 2017 Alexander Grebenyuk (github.com/kean).

	import Foundation
	import RxSwift
	import RxCocoa


	extension ObservableType {

	extension UIImage {

	func fixedOrientation() -> UIImage {

	if imageOrientation == UIImageOrientation.Up {
	return self
	}

	var transform: CGAffineTransform = CGAffineTransformIdentity