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Understanding @inlinable in Swift Understanding @inlinable in Swift December 22nd, 2020 The @inlinable attribute is one of Swift's lesser-known attributes. Like others of its kind, its purpose is to enable a...

DispatchSource: Detecting changes in files and folders in Swift DispatchSource: Detecting changes in files and folders in Swift November 24th, 2020 The DispatchSource family of types from GCD contains a series of...

How Swift API Availability Works Internally How Swift API Availability Works Internally September 29th, 2020 We use API availability checks all the time to provide fallbacks for users running older iOS versions, but...

UI Testing Deeplinks and Universal Links in iOS UI Testing Deeplinks and Universal Links in iOS September 15th, 2020 Did you know it's possible to terminate your app in the middle of an XCUITest and launch it again...

Improving Observer Pattern APIs in Swift With Weak Collections Improving Observer Pattern APIs in Swift With Weak Collections August 25th, 2020 Even if you don't know what the Observer pattern is, there's a good...

App Attest: (Properly!) Protecting iOS apps from Jailbreak Tweaks in iOS 14 App Attest: (Properly!) Protecting iOS apps from Jailbreak Tweaks in iOS 14 August 11th, 2020 When jailbreaking of iOS devices first became...

Entry Points in Swift: How @main and @UIApplicationMain work internally Entry Points in Swift: How @main and @UIApplicationMain work internally July 21st, 2020 In this article, we'll see how Swift determines the...

Adapting Objective-C APIs to Swift with NS_REFINED_FOR_SWIFT Adapting Objective-C APIs to Swift with NS_REFINED_FOR_SWIFT July 14th, 2020 If your iOS project uses Objective-C SDKs, you'll find that the compiler does...

Creating Debug Menus in Swift with UIContextMenuInteraction Creating Debug Menus in Swift with UIContextMenuInteraction June 30th, 2020 Debug menus in iOS are a very effective way to make your day more productive as...

How to create Widgets in iOS 14 in Swift How to create Widgets in iOS 14 in Swift June 23rd, 2020 Widgets existed in iOS for a long time, but iOS 14 completely revamped them. With the new Widget APIs, not you're...

Benefits of using throwing functions (try) - Swift's most underrated feature? Benefits of using throwing functions (try) - Swift's most underrated feature? June 16th, 2020 I've always found throwing functions...

How Random Numbers Work In Swift How Random Numbers Work In Swift May 12th, 2020 Before Swift 4.2, generating random numbers involved using raw C APIs. With the addition of the RandomNumberGenerator protocol in...

iOS Responder Chain: UIResponder, UIEvent, UIControl and uses iOS Responder Chain: UIResponder, UIEvent, UIControl and uses March 1, 2019 What on earth is this "first responder" thing when I'm dealing with...

Unit Testing Preprocessor Macros in Swift Unit Testing Preprocessor Macros in Swift May 5th, 2020 Preprocessor macros are used to bring context to a build, allowing you to transform how your app is compiled...

Discovering which DispatchQueue a method is running on Discovering which DispatchQueue a method is running on April 25th, 2020 The DispatchQueue class has lots of interesting and undocumented (unfortunately) hidden...

Weak Dictionary Values in Swift Weak Dictionary Values in Swift April 14th, 2020 When dealing with dictionaries and arrays in Swift, it's very important to know that any reference types used as a key or value will...

Understanding Swift's ObjectIdentifier Understanding Swift's ObjectIdentifier March 31st, 2020 ObjectIdentifier is one of these obscure Swift types that you only see when looking at the answers for very specific...

Useful Global Swift Functions Useful Global Swift Functions March 24th, 2020 Global functions, or functions that can be accessed from anywhere without the scope of a specific type is an old concept that was popular...

How Collection Diffing works in Swift How Collection Diffing works in Swift March 18th, 2020 Ordered Collection Diffing is a feature added in Swift 5.1 that allows you to calculate and apply the difference between...

Swift Codable: Decoding / Encoding With Context Swift Codable: Decoding / Encoding With Context February 5th, 2020 The Codable protocols are one of the coolest recent additions to Swift. Even though it works...

Reducing iOS Build Times by using Interface Modules Reducing iOS Build Times by using Interface Modules January 23rd, 2020 While dividing an app into several modules can improve the build time of an iOS app, the...

How Hashable works in Swift How Hashable works in Swift January 13th, 2020 Hashing algorithms are functions that map an arbitrary string to a seemingly "random" output with a fixed length. Commonly associated as a...

Using Type Erasure to Build a Dependency Injecting Routing Framework in Swift Using Type Erasure to Build a Dependency Injecting Routing Framework in Swift January 2nd, 2020 With Swift being a very type-safe and...

collection of a single element. While this sounds a bit weird, there's a good reason for this to exist. Let's check out why.--> Faster Array Operations With CollectionOfOne in Swift Faster Array Operations With...

How OptionSet works inside the Swift Compiler How OptionSet works inside the Swift Compiler December 3rd, 2019 Swift's OptionSet protocol is the bridged version of Objective-C's NS_OPTIONS enum -- a handy tool that...

NSCopying uses in Swift NSCopying uses in Swift November 5th, 2019 Even in apps written in full Swift, interfacing with Objective-C is still a very big part of iOS development. Many types and semantics from...

Swift's Sequence Inside The Compiler: How for loops work internally Swift's Sequence Inside The Compiler: How for loops work internally October 26, 2019 One of my favorite things about Swift is that almost every...

Building a Face Detecting Robot with URLSessionWebSocketTask, CoreML, SwiftUI and an Arduino Building a Face Detecting Robot with URLSessionWebSocketTask, CoreML, SwiftUI and an Arduino October 16, 2019 iOS 13 marks...

Using SIMD Vector Types in Swift Using SIMD Vector Types in Swift September 30, 2019 SIMD Vector Types is a feature added in Swift 5 that exposes Apple's <simd/simd.h> module to Swift, allowing you to calculate...

Timsort and Introsort: Swift's Sorting Algorithms Timsort and Introsort: Swift's Sorting Algorithms September 4, 2019 Have you ever asked yourself which algorithm is used by Swift's sorting method? There are many...

Advanced lldb tricks for Swift - Injecting and changing code on the fly Advanced lldb tricks for Swift - Injecting and changing code on the fly August 8, 2019 While Xcode provides several visual abstractions for...

Swift ExpressibleBy protocols: What they are and how they work internally in the compiler Swift ExpressibleBy protocols: What they are and how they work internally in the compiler July 17, 2019 ExpressibleBy...