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Translation
A browsable archive of writing and notes across the site.
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Method dispatch in Swift
What is method dispatch? Method dispatch is the process by which the program, at runtime, decides which concrete instruction to use when a particular method is called. Dispatch is …
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Protocol Extension
Protocol is the most important building block in the Swift ecosystem — the scaffolding that holds everything else together. A few of the obvious wins of using protocols over …
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Using a C file in a Swift Framework: an exploration
The problem While building a diagnostics tool, we shipped it as a single Pod containing only pure Swift code. The Swift code needed to call into a few system C library features — …
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Making a "Send to 2Do" Safari bookmarklet
Drag the link below onto your Favorites Bar. The default click behaviour simulates navigation on the current page, and the destination URL is whatever you put after …
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My reading workflow
I’ve been tightening up my reading workflow lately, so here’s an update. The tools involved: DEVONThink Pro PDFExpert MarginNote (1) is the inbox and archive; (3) is …
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Testing Swift code that uses system singletons in 3 easy steps
Original: Testing Swift code that uses system singletons in 3 easy steps Original author @johnsundell Most apps built on Apple platforms lean on singleton-based APIs. From …
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Avoiding singletons in Swift
Original: Avoiding singletons in Swift Original author & Copyright @johnsundell “I know singletons are bad, but…” — you hear it all the time when developers are …
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Different flavors of dependency injection in Swift
Original: Different flavors of dependency injection in Swift Original author & copyright: @johnsundell In previous posts we’ve looked at several ways of using dependency …
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My favourite Mac apps
A running list of the Mac apps I reach for. Every time I reinstall macOS, I forget to grab one or two of these and only notice once I actually need them (I don’t always …
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What is LLVM
What is LLVM? The secret behind Swift, Rust, Clang, and more Understanding how a compiler emits native machine code makes it dramatically easier to invent a new language or enhance …
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In-app purchase
If your app ships on the App Store, in-app purchase (IAP) is something you can’t really avoid. Last year’s spat between WeChat tipping and Apple put IAP in the …
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Dependency injection using factories in Swift
Original: Dependency injection using factories in Swift Original author & copyright: @johnsundell Dependency injection is one of the key tools for making code more testable. …
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Modularising Xcode projects
Original: Modular Xcode projects Author & Copyright @pepibumur Translator: @OgreMergO Building a modular Xcode project takes a real understanding of project structure and the …
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Handling non-optional optionals in Swift
Original: Handling non-optional optionals in Swift Original author & copyright @johnsundell Optionals are arguably one of the most important features of Swift, and one of the …
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Understanding responders and the responder chain
Apps receive and handle events through responder objects. A responder is an instance of the UIResponder class — and UIView, UIViewController, and UIApplication, all the usual …
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Capturing objects in Swift closures
Original: Capturing objects in Swift closures Original author @johnsundell Ever since blocks were introduced to Objective-C in iOS 4, they’ve been a core part of the most …
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@autoclosure && @escape
Closures are first-class citizens in Swift, which means you can pass them around as arguments. While learning Swift, you keep running into keywords that decorate these closure …
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Everything you need to know about iOS 10 notifications
Overview Push notifications are something we’re all familiar with — pretty much anyone with a smartphone gets interrupted by them every day. The right notification is a …
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Building an elastic view animation with UIBezierPath
Original: Elastic view animation, or how I built DGElasticPullToRefresh Author: @gontovnik DGElasticPullToRefresh demonstrates a springy elastic effect. Here’s what it looks …
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A bit about Category in Objective-C
A category in Objective-C is a compile-time mechanism that lets you tack extra methods onto an existing class. There’s one catch: you can’t add new instance variables …
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Understanding the Objective-C runtime
The Objective-C runtime is one of those language features that’s easy to overlook when you’re just stepping into Cocoa/Objective-C land. The reason is simple: …
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How we built the Guillotine menu animation for iOS
Original: How We Created Guillotine Menu Animation for iOS Author: @johnsundell Ever wondered why nearly every app’s menu is a sidebar? Why isn’t it a topBar, a …