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03 December 2021
As many of you know, this site is open source. Most of the time, this does not cause any trouble. But occasionally, it does.
turing complete with a stack of 0xdeadbeef
I mostly write about Swift, Objective-C, iOS, open source, and other software development topics. Sometimes I write about the ethics of tech, labor, and politics. I also write personal essays and notes on what I'm currently reading.
As many of you know, this site is open source. Most of the time, this does not cause any trouble. But occasionally, it does.
Everyone in tech seems to have a “terrible tech interview” story. The topic quietly orbits in the ether of our industry and periodically bursts through the atmosphere in the form of a tweet or blog post that goes viral. Despite universal loathing of our industry’s impetuous and heedless interview processes, few seem willing to improve the current standard. A recent tweet in my timeline reminded me of a story that I’ve never told.
Sometimes living in the Bay Area, the home of Dreamforce, is like sleep walking through life. Mostly because you want to fall asleep when a nearby stranger starts talking about their new startup idea or how cryptocurrency is definitely not a pyramid scheme.
Bob Black published his essay The Abolition of Work in 1985, though it is as prescient as ever. You can find it freely available at The Anarchist Library. As you might anticipate, it is a critique and criticism of work. The first sentence of the essay is “No one should ever work.” — a sentiment I fully endorse and which I suspect the careerist workaholics in Silicon Valley will shun as sacrilege.
A few weeks ago, I wrote about this bizarre Xcode 13 crash when running tests. I just discovered the root cause for one of the issues I mentioned in that post — I think. At the very least, I have a “fix”. The issue happens when running unit tests. Sometimes the full test suite will complete, sometimes not, and then LLDB will crash. This occurs with all of my projects. It doesn’t seem to matter what I do, the crash always happens. It has been driving me crazy.
Peter Kropotkin wrote and first published The Wage System in La Revolte in 1888. It was translated for Freedom newspaper in 1889. Surprisingly, the essay is not available at The Anarchist Library. However, you can find it in Why Work? Arguments for the Leisure Society, a collection of essays (re)published by PM Press. The essays focus on dissecting “work”, its form under capitalism, and the possibilities for an alternative society.
If you are working on a multiplatform SwiftUI project, you will start accumulating #if os() checks and #if canImport() checks. Overtime, these start to accumulate and — in addition to being unsightly — they make your code much more difficult to read. When possible, I have started to encapsulate these preprocessor directives to improve code organization and readability.
As of iOS 14 and macOS 11, you can define the entry-point and app lifecycle of your app in SwiftUI with the App protocol instead of using the traditional UIApplicationDelegate protocol from UIKit. However, SwiftUI is still missing the majority of APIs from UIKit. For any serious app, you’ll need to provide an app delegate.
This post started out as a “how to” for SwiftUI, but as I started testing and verifying I realized it is just an Xcode 13 bug. Historically, if you wanted to restrict your iOS app to specific device orientations, you would check or uncheck the various “Device Orientation” options in your project settings. You can find these by selecting your Xcode Project > App Target > “General” tab.
I’ve spent this past week diving into SwiftUI, seriously, for the first time. As you know, I’ve been keeping my eye on it since it was released, but I’ve avoided it due to a combination of hesitancy, apprehension, and just being too busy with other projects and work. However, while taking some time off from contracting work, I decided to dive in.
I’ve decided to deprecate one of my open source libraries, PresenterKit. The library has been in a sort of “maintenance mode” for awhile now. It never really became what I hoped and anticipated. I think it implemented some neat ideas and helped removed some boilerplate from UIKit, but I don’t think what it provided necessarily justified a library anymore — at least not given the lack of activity around the project.
I discovered a bug in Xcode 13 where tests crash for framework projects, preventing unit tests from successfully running on CI. The issue is due to some obscure code signing or debugger error that did not occur on Xcode 12. Fortunately, I have found a workaround.
I came across a situation today where I needed to run an iOS test suite for a Swift Package. Previously, this required you to have an Xcode project but it no longer does.
Ever so often an iOS developer asks me how to get started with making their own blog or portfolio website. Or, I’ll see a software developer from another community on Twitter ask the same thing. Often they are earlier in their career, or unfamiliar with web development, or unsure whether to build from scratch or use a platform, or all of the above. I find myself consistently making the same recommendations to folks. For this post, I want to share what I think is a great approach to get started, and how you can dive deeper once you master the basics.
In last week’s issue of iOS Dev Weekly, Dave linked to this tweet from Mohammad Azam, which linked to this StackOverflow post on resetting your app between UI tests by completely deleting it. It’s a very clever idea! This post offers an improved version of the code and some thoughts on when to use this.
After the second worst fire season ever recorded, we are now facing unprecedented disastrous storms in California. I was watching reports last night from various local Bay Area news stations. In one segment, a reporter casually mentioned that police would be doing extra patrols to prevent looting. The same thing happened in Louisiana. Don’t let them loot, they said, as their streets became rivers.
Using git aliases came up at work the other day. It’s been awhile since I’ve written about git, so I thought it might be a good time to share all the aliases I’ve built up over the years.
Periodically, I go back to add updates to older posts. I’ve been doing this for some time now, although not as often as I would like. I aspire to be as good and diligent as Michael Tsai, but that’s an incredibly high bar. (How does he do it?!)
This post continues from my earlier post on label-based GitHub Actions workflows. A common and tedious task in a typical pull request workflow is updating your branch with changes from the default branch of your repo. In many scenarios, you may want to rebase your pull request on the main branch or merge the main branch into your pull request.
Here in Oakland and the rest of the Bay Area, more and more restaurants, bars, venues, and various events are requiring that people show proof of vaccine before entering. (As it should be.) Thankfully, all businesses and events allow showing proof digitally rather than carrying around your physical COVID-19 Vaccination Record Card from the CDC. This means you can take a photo with your phone and present that instead of your singular paper copy. This is great, but the tediousness of tapping around my phone to find and display it has been annoying. So, I made an iOS shortcut to present it instantly.
My current team has started using GitHub Actions to automate some tedious tasks for pull requests. In particular, we use labels on GitHub to categorize pull requests or highlight important metadata about them. Most of the time, a machine can figure out which labels are appropriate to add or remove. This is a great use case for GitHub Actions.
When GitHub actions first launched, the recommended way to cache your Bundler dependencies was to use GitHub’s cache action. However, that is no longer the case. You should be using the Ruby team’s setup-ruby action instead.
After I wrote and released Foil, my library for implementing a property wrapper for UserDefaults, one of the criticisms on Twitter was that a mechanism for observing such properties should have been included. I disagreed. In the post I argued that this was easy enough for clients to handle on their own, but more importantly that there are too many options for how to do this and I didn’t think Foil should impose any one of them on clients.
I previously wrote about implementing Dark Mode in an older codebase, specifically how Dark Mode works (or doesn’t) with CGColor. I recently fixed a bug in the same project that was difficult to track down because it manifested in such a strange way. After finding the problematic code, I realized that it is an extremely common scenario in iOS codebases — so you might have this bug in your code as well!
I was recently working on a project that uses modern collection views on iOS — that is, using diffable data sources, snapshots, and cell providers. I hooked up all the components and my collection view was working, or so I thought. I started to notice some very odd, unpredictable behavior when the collection view was updated. Some of the time, the cells were updated correctly. Other times, I would see duplicates and missing data. Here’s what went wrong.
This year at WWDC, some significant improvements and changes were announced for UICollectionView and UITableView. You can watch 10252: Make blazing fast lists and collection views for all the details, but I want to highlight some of them here.
I’ve been following what’s going on with SwiftUI since it was released with iOS 13 at WWDC 2019 and have even taken extensive notes, but I have avoided using it. As I wrote before, I mainly wanted to avoid dealing with bugs and workarounds that might make me less productive compared to using UIKit, which I know quite well. I’m very interested in learning and using it, I’m just hesitant given some of Apple’s history, like early years of Swift. I have no doubt that SwiftUI will be the future of Apple platform development, the question is when that future will arrive. This year the framework is debuting its third major release in iOS 15. How far has SwiftUI come, and is it ready for building serious apps?
I recently became acquainted with The United Front Against Displacement at an event in Oakland. UFAD is an anti-gentrification organization and there is a Bay Area chapter along with chapters in a few other major cities.
I was very excited at this year’s WWDC when Apple announced DocC, their new “Documentation Compiler” tool that generates documentation from comments in your source code. Unfortunately, it’s not going to work for the majority of open source authors.