Konstantin Gonikman CocoaPriest

Following the tradition from last year, here's my complete list of all interesting features and updates I could find in Apple's OSes, SDKs and developer tools that were announced at this year's WWDC. This is based on the keynotes, the "What's New In ..." presentations and some others, Apple's release notes, and blog posts and tweets that I came across in the last few weeks.

If for some reason you haven't watched the talks yet, I really recommend watching at least the "State of the Union" and the "What's New In" intros for the platforms you're interested in. The unofficial WWDC Mac app is great way to download the videos and keep track of what you've already watched.

If you're interested, here are my WWDC 2015 notes (might be useful if you're planning to drop support for iOS 8 now and start using some iOS 9 APIs).

OSX → macOS 10.12 Sierra

A non-exhaustive list of WebGL and WebGPU frameworks and libraries. It is mostly for learning purposes as some of the libraries listed are wip/outdated/not maintained anymore.

Engines and libraries ⚙️

Name	Stars	Last Commit	Description
three.js	![GitHub

libdispatch efficiency tips

The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).

My take-aways are:

You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.
Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse

True Color (24-bit) and italics with alacritty + tmux + vim (neovim)

This should make True Color (24-bit) and italics work in your tmux session and vim/neovim when using Alacritty (and should be compatible with any other terminal emulator, including Kitty).

Testing colors

Running this script should look the same in tmux as without.

curl -s https://gist.githubusercontent.com/lifepillar/09a44b8cf0f9397465614e622979107f/raw/24-bit-color.sh >24-bit-color.sh

	// Swift Standard Librray - String
	// Keith Harrison http://useyourloaf.com

	// Import Foundation if you want to bridge to NSString
	import Foundation

	// ====
	// Initializing a String
	// ====

	# The trick is to link the DeviceSupport folder from the beta to the stable version.
	# sudo needed if you run the Mac App Store version. Always download the dmg instead... you'll thank me later :)

	# Support iOS 15 devices (Xcode 13.0) with Xcode 12.5:
	sudo ln -s /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/15.0 /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport

	# Then restart Xcode and reconnect your devices. You will need to do that for every beta of future iOS versions

	# (A similar approach works for older versions too, just change the version number after DeviceSupport)

	import Foundation
	import UIKit

	class UIDirectionAbidingCollectionView : UICollectionView {

	override init(frame: CGRect, collectionViewLayout layout: UICollectionViewLayout) {
	super.init(frame: frame, collectionViewLayout: layout)
	setupDelayRecognizer()
	}

	// First, install InjectionIII.app from the Mac AppStore
	// https://apps.apple.com/us/app/injectioniii/id1380446739?mt=12

	// Make these changes to your code:

	// add the following to application(didFinishLaunchingWithOptions:)
	#if DEBUG
	Bundle(path: "/Applications/InjectionIII.app/Contents/Resources/iOSInjection.bundle")?.load()
	#endif

	// How to:
	// 1. Open the Firebase Analytics Dashboard
	// 2. Scroll to bottom, where you see the "Users by Device model" widget
	// 3. Click "View device models" in that widget (this opens the "Tech details" Firebase Analytics page)
	// 4. Above the table shown in the new page, click on the “Device model” drop down menu and select “OS with Version”
	// 5. Make sure to select “OS with version” and not “OS Version”
	// 6. On the top right corner of the page, click on the “Share this report” icon (next to the date)
	// 7. Click “Download file” on the new side bar, then “Download CSV"
	// 8. Open the file and select the iOS/Android breakdown raw data
	// 9. Replace the sample data in this script with your data

	erase_sim:
	./reset_sim.sh 2>/dev/null; true