Nick Thompson inickt

A collection of information about accessing raw MultiTouch events on MacOS.

Compiled while building mtif (a MultiTouch interface for common lisp).

Useful URLS

1. Run Software Update

Make sure everything is up to date in the App Store

2. Install Homebrew

Open a terminal window and execute the Homebrew install script:

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

	import UIKit

	class RootViewController: UIViewController {
	override func viewDidAppear(_ animated: Bool) {
	super.viewDidAppear(animated)

	let text = "Cute cat"
	let image = UIImage(named: "cat.jpg")!

	// Note: you can't wrap the text and image into a single "TextImage" object and selectively return both or one as UIActivityItemSource doesn't like holding arrays

	class FirebaseCoordinator {
	static let shared = FirebaseCoordinator()
	static let initialize: Void = {
	/// We modify Google Firebase (and eventually Analytics) to load the mac-specific plist at runtime.
	/// Google enforces that we have a file named "GoogleService-Info.plist" in the app resources.
	/// This is unfortunate since we need two different files based on iOS and Mac version
	/// One solution is a custom build step that copies in the correct file:
	/// https://stackoverflow.com/questions/37615405/use-different-googleservice-info-plist-for-different-build-schemes
	/// However, this is basically impossible since Catalyst doesn't set any custom build variables, so detection is extremely difficult.
	/// We swizzle to modify the loading times.

	Mute these words in your settings here: https://twitter.com/settings/muted_keywords

	ActivityTweet
	generic_activity_highlights
	generic_activity_momentsbreaking
	RankedOrganicTweet
	suggest_activity
	suggest_activity_feed
	suggest_activity_highlights
	suggest_activity_tweet

	import UIKit

	#if canImport(SwiftUI) && DEBUG
	import SwiftUI
	struct UIViewControllerPreview<ViewController: UIViewController>: UIViewControllerRepresentable {
	let viewController: ViewController

	init(_ builder: @escaping () -> ViewController) {
	viewController = builder()
	}

	#include "scheme.h"
	#include "base.c"

	static int run(Scheme_Env* e, int argc, char* argv[]) {
	scheme_env = e;

	declare_modules(e);

	scheme_namespace_require(scheme_intern_symbol("racket/base"));

	class FairPlayer: AVPlayer {

	private let queue = DispatchQueue(label: "com.icapps.fairplay.queue")

	func play(asset: AVURLAsset) {
	// Set the resource loader delegate to this class. The `resourceLoader`'s delegate will be
	// triggered when FairPlay handling is required.
	asset.resourceLoader.setDelegate(self, queue: queue)

	// Load the asset in the player.

	// Created by Tony Mann on 3/22/15.
	// Copyright (c) 2015 7Actions. All rights reserved.
	//
	// Adapted from http://ossh.com.au/design-and-technology/software-development/implementing-rich-text-with-images-on-os-x-and-ios/

	import UIKit

	class ImageAttachment: NSTextAttachment {
	var verticalOffset: CGFloat = 0.0