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Written by Mattt October 14th, 2019 This article has been translated into: 한국어 Working on a large iOS codebase often involves a lot of waiting: Waiting for Xcode to index your files, waiting for Swift and Objective-C code to compile, waiting for the Simulator to boot and your app to launch… And after all of that, you spend even more time getting your app into a particular state and onto a particul

Written by Mattt November 12th, 2019 This article has been translated into: 한국어 One of the great unsolved questions in iOS development is, “How do I store secrets securely on the client?” Baked into this question is the assumption that, without taking proper measures, those secrets will be leaked in one way or another — either in source revision control (GitHub and the like), from analysis tools r

Apple announced a lot at WWDC this year. During the conference and the days that followed, a lot of us walked around in a daze, attempting to recover from have our minds “hashtag-mindblown’d” (#🤯). But now a few months later, after everything announced has launched (well, almost everything) those very same keynote announcements now elicit far different reactions: Although the lion’s share of atte

Today is Labor Day in the United States (and Labour Day in Canada), a day to celebrate the achievement of the workers who organized to bring about fair and safe conditions for employees — protections that serve as the foundation for the modern workplace. Labor Day is also the unofficial end of summer; the long weekend acting as a buffer between the lemonades, sunburns, and trashy romance novels of

Years ago, we remarked that the “at sign” (@) — along with square brackets and ridiculously-long method names — was a defining characteristic of Objective-C. Then came Swift, and with it an end to these curious little 🥨-shaped glyphs …or so we thought. At first, the function of @ was limited to Objective-C interoperability: @IBAction, @NSCopying, @UIApplicationMain, and so on. But in time, Swift

Apple’s press release announcing the company’s annual developer conference featured an illustration of a robot head (🤖) bursting with code symbols, emoji, and Apple iconography. All last week, attendees saw this motif in slides and signage throughout McEnery Convention Center, with variations featuring heads of monkeys (🐵), aliens (👽), skulls (💀), and other Animoji characters. Beyond presentin

Software development best practices prescribe strict separation of configuration from code. Yet developers on Apple platforms often struggle to square these guidelines with Xcode’s project-heavy workflow. Understanding what each project setting does and how they all interact with one another is a skill that can take years to hone. And the fact that much of this information is buried deep within th

UITableView is the bread and butter of iOS apps. This is as true today as it was with the first iPhone over a decade ago. Back in those early days, developers worked hard to achieve smooth scroll performance — often resorting to extreme measures. For example, to achieve 60FPS on a table view with custom cells on an iPhone 3G you’d often have to draw text directly to a cell’s Core Graphics context,

I just left a hipster coffee shop. It was packed with iOS devs, whispering amongst each other about how they can’t wait for Apple to release an official style guide and formatter for Swift. Lately, the community has been buzzing about the proposal from Tony Allevato and Dave Abrahams to adopt an official style guide and formatting tool for the Swift language. Hundreds of community members have wei

Importing Dependencies Start by creating a new .swift file with a shebang at the beginning (more on that later). $ echo '#!/usr/bin/swift sh' > bridge.swift Next, add import declarations for three modules: DeckOfPlayingCards, PlayingCard, and Cycle. import DeckOfPlayingCards // @NSHipster ~> 4.0.0 import PlayingCard import Cycle // @NSHipster == bb11e28 The comment after the import declaration for

Visual Studio Code (VSCode) is a cross-platform text and source code editor from Microsoft. It’s one of the most exciting open source projects today, with regular updates from hundreds of contributors. VSCode was among the first tools to support Language Server Protocol (LSP), which has played a large part in providing a great developer experience, in a variety of languages and technologies. With

Written by Mattt October 22nd, 2018 This article has been translated into: 한국어 SwiftSyntax is a Swift library that lets you parse, analyze, generate, and transform Swift source code. It’s based on the libSyntax library, and was spun out from the main Swift language repository in August 2017. Together, the goal of these projects is to provide safe, correct, and intuitive facilities for structured e

In October 2018, Apple announced on the Swift.org forums that it was starting work to adopt the Language Server Protocol (LSP) for Swift and C languages. At Apple we are making it a priority to support high-quality tooling for all Swift developers, including those working on non-Apple platforms. We want to collaborate with the open-source community and focus our efforts on building common infrastr

If we want to learn more, we’ll need to roll up our sleeves and get our hands dirty with some low-level APIs. Digging Deeper with CoreGraphics Let’s start our investigation by creating a new Xcode Playground. For simplicity, we can hard-code a URL to the “Mojave.heic” file on our system. import Foundation import CoreGraphics // macOS 10.14 Mojave Required let url = URL(fileURLWithPath: "/Library/D

Written by Mattt September 17th, 2018 This article has been translated into: español , français , 한국어 , and 中文 If you tuned in to this year’s WWDC Keynote, you’ll know all about the big features in iOS 12: Siri Shortcuts, ARKit 2, and Core ML 2 — not to mentioned the bombshell pre-announcement of the long-rumored iOS / Mac bridge, codenamed “Marzipan”. And if you watched this year’s Platforms Stat

Like everyone else in the Pacific Northwest, we got snowed-in over the weekend. To pass the time, we decided to break out our stash of board games: Carcassonne, Machi Koro, Power Grid, Pandemic; we had plenty of excellent choices available. But cooped up in our home for the afternoon, we decided on a classic: Cluedo. Me, I’m an avid fan of Cluedo — and yes, that’s what I’m going to call it. Becaus

Written by Nate Cook March 16th, 2015 This article has been translated into: 中文 Dates. More than any other data type, the gulf between the initial banality of dates and their true, multifaceted complexity looms terrifyingly large. Combining sub-second precision, overlapping units, geopolitical time zone boundaries, localization differences in both language and grammar, and Daylight Saving shifts a

With 2015 behind us and the new year begun, it’s time again for an NSHipster tradition: reader submissions! As in year’s past, this installment is chock full of tips and tricks that can help ease your days working with Xcode, Swift, and Objective-C. Many thanks to Cédric Luthi, Josip Ćavar, Juraj Hilje, Kyle Van Essen, Luo Jie, Mathew Huusko V, Nicolás Jakubowski, Nolan O’Brien, Orta Therox, Ray F

Written by Mattt January 7th, 2019 (revised) This article has been translated into: 中文 This week’s article is about dictionaries. No, not the Dictionary / NSDictionary / CFDictionaryRef we encounter every day, but rather those distant lexicographic vestiges of school days past. Though widely usurped of their ‘go-to reference’ status by the Internet, dictionaries and word lists serve an important r

Written by Nate Cook & Mattt August 1st, 2018 (revised) This article has been translated into: español , français , and 中文 “We should do (as wise programmers aware of our limitations) our utmost best to … make the correspondence between the program (spread out in text space) and the process (spread out in time) as trivial as possible.” —Edsger W. Dijkstra, “Go To Considered Harmful” It’s a shame t

Written by Nate Cook April 13th, 2015 This article has been translated into: 中文 APIs do more than just exposing functionality to developers. They also communicate values about how the API should be used and why. This communication is what makes naming things one of the Hard Parts of computer science; it’s what separates the good APIs from the great. A reading of Swift’s standard library shows a cl

Written by Croath Liu June 29th, 2015 This article has been translated into: 中文 As an iOS developer, if you want to make an application on your own, you sometimes need to write back-end code. Even for the developer who can take that on, there is more than just the code, there’s also maintenance. Your worst fear becomes not that people might not like your application, but that your server might fai

Written by Nate Cook June 22nd, 2015 This article has been translated into: 中文 WWDC 2015 may not have packed quite as many fireworks as its predecessor, but neither was it short on the new and shiny. The introduction of watchOS 2, including a revamped WatchKit, access to the Apple Watch hardware, and support for complications. Major changes to the Swift language and the announcement of open source

On April 9th, the first-ever NSHipster Pub Quiz was held in Berlin. Think of your traditional pub quiz crossed with “Stump the Experts”, with questions about things that you know and care about: computers, programming, Apple trivia—that sort of thing. The event was hosted by UIKonf, and made possible by its organizers Chris Eidhof, Matt Patterson, and Peter Bihr. Thanks again to Chris, Matt, and P

Conversion is a tireless errand in software development. Most programs boil down to some variation of transforming data into something more useful. In the case of user-facing software, making data human-readable is an essential task — and a complex one at that. A user’s preferred language, calendar, and currency can all factor into how information should be displayed, as can other constraints, suc

Written by Nate Cook March 30th, 2015 This article has been translated into: 中文 Debugging can be an exercise in irony. We create programs that tell our pint-sized supercomputers to complete infinitely varied and incalculable tasks on our behalf, yet when trying to understand those same programs, we tell the computers to wait for us. For example, suppose I’m trying to figure out why the UINavigatio

Written by Nate Cook February 9th, 2015 This article has been translated into: 中文 Swift, true to its name, is moving fast. This week marks the beta release of Swift 1.2, a major update to the language. The Swift team has responded to so many of the community’s requests in one fell swoop, we’re overflowing with new and exciting features. Every line-item in this announcement is a big advancement: in

Written by Nate Cook February 2nd, 2015 This article has been translated into: 中文 Show, don’t tell. Seeing is believing. A picture is worth a thousand emails words. Whatever the cliché, replacing an interface that requires us to memorize and type with one we can see and manipulate can be an enormous improvement. Xcode 6 makes just such a substitution, building new interactions on top of old techno