kylehughes

// Copyright 2021 Kyle Hughes
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
// documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
// Software.
//

andymatuschak

A composable pattern for pure state machines with effects

State machines are everywhere in interactive systems, but they're rarely defined clearly and explicitly. Given some big blob of code including implicit state machines, which transitions are possible and under what conditions? What effects take place on what transitions?

There are existing design patterns for state machines, but all the patterns I've seen complect side effects with the structure of the state machine itself. Instances of these patterns are difficult to test without mocking, and they end up with more dependencies. Worse, the classic patterns compose poorly: hierarchical state machines are typically not straightforward extensions. The functional programming world has solutions, but they don't transpose neatly enough to be broadly usable in mainstream languages.

Here I present a composable pattern for pure state machiness with effects,

deanlyoung

Note

Apple will reject apps that are using private url schemes (Ugh, Apple....) if they are pretty much obvius. Some apps are rejected and others are not, so, be aware of this issue before implementing any of those URL's in your app as a feature.

Updates

• [UPDATE 4] iOS 10 update: apparently settings now can be reached using App-Pref instead of prefs
• [UPDATE 3] For now you just can use url schemes to open your apps's settings with Swift 3.0 (Xcode 8). I'll keep you informed when OS preferences can be reached
• [UPDATE 2] The openURL() method of UIApplication is now deprecated. You should use application(_:open:options:) instead
• [UPDATE 1] Not yet tested in iOS 10. It will fail because of policies changes in URL scheme handling.

tclementdev

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

truizlop

import SwiftUI

let LINE_LENGTH: Double = 500.0
let N = 720
let LINES = 18
let WAVES: Double = 18.0
let WAVE_HEIGHT: Double = 20
let SPACING: Double = 27.0
let CURL_AMOUNT: Double = 12.0

IanColdwater

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

chockenberry

import UIKit
import Foundation

// NOTE: This playground shows how to use Swift's AttributedString with Markdown.
//
// This code was used to display Markdown content in the Tot iOS Widget <https://tot.rocks>

// MARK: - Helpful Links

// NOTE: The following links helped me figure this stuff out.

MasonSlover

//The following file has 20 arrays, allSymbols[] has the title of every SFSymbol, and the remaining 19 arrays have the following categories:
//communication, weather, objectsAndTools, devices, connectivity, transportation, human, nature, editing, textFormatting, media, keyboard, commerce, time, health, shapes, arrows, indicies, math

private var allSymbols = ["0.circle", "00.circle", "0.circle.fill", "00.circle.fill", "0.square", "00.square", "0.square.fill", "00.square.fill", "1.circle", "01.circle", "1.circle.fill", "01.circle.fill", "1.magnifyingglass", "1.square", "01.square", "1.square.fill", "01.square.fill", "2.circle", "02.circle", "2.circle.fill", "02.circle.fill", "2.square", "02.square", "2.square.fill", "02.square.fill", "3.circle", "03.circle", "3.circle.fill", "03.circle.fill", "3.square", "03.square", "3.square.fill", "03.square.fill", "4.alt.circle", "4.alt.circle.fill", "4.alt.square", "4.alt.square.fill", "4.circle", "04.circle", "4.circle.fill", "04.circle.fill", "4.square", "04.square", "4

steipete

// Taken from the commercial iOS PDF framework http://pspdfkit.com.
// Copyright (c) 2014 Peter Steinberger, PSPDFKit GmbH. All rights reserved.
// Licensed under MIT (http://opensource.org/licenses/MIT)
//
// You should only use this in debug builds. It doesn't use private API, but I wouldn't ship it.

// PLEASE DUPE rdar://27192338 (https://openradar.appspot.com/27192338) if you would like to see this in UIKit.

#import <objc/runtime.h>
#import <objc/message.h>

EthanLipnik

//
//  Blur.swift
//
//
//  Created by Ethan Lipnik on 11/21/22.
//

import SwiftUI

private struct BlurModifier: ViewModifier {