Typed throws are new since Xcode 16 and allow you to define the type of error a method throws. Instead of handling any error, you can handle exact cases and benefit from compiling time checks for newly added instances. They were introduced and designed in Swift Evolution proposal SE-413. I encourage you to read Try …
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Async await in Swift explained with code examples
Async await is part of the new structured concurrency changes that arrived in Swift 5.5 during WWDC 2021. Concurrency in Swift means allowing multiple pieces of code to run at the same time. This is a very simplified description, but it should give you an idea already how important concurrency in Swift is for the …
Swift 6: Incrementally migrate your Xcode projects and packages
Apple announced Swift 6 during WWDC 2024 as a major release of their programming language. It aims to create a fantastic development experience, and many of the latest features we know today are part of the road toward this major version bump. The Swift development team shared their focus areas for 2023 and released a …
Swift Package Manager framework creation in Xcode
Swift Package Manager (SPM) is Apple’s answer for managing dependencies. We’re all familiar with tools like CocoaPods and Carthage, but we’ll likely all use Swift Package Manager soon instead of those. If you’re deciding which package manager to use, it’s recommended to start using SPM today. By switching to the Swift Package Manager, we also …
ChatGPT for Swift: Top 5 code generation prompts
Using ChatGPT for Swift code generation can drastically increase your productivity. While I’m uncertain whether AI will take over our jobs as developers, I’m certain developers without knowledge of using AI to their advantage will become much slower in writing code. Today, we will look at a few of my favorite ways of using ChatGPT …
MVVM: An architectural coding pattern to structure SwiftUI Views
MVVM (Model-View-ViewModel) is an architectural coding pattern for structuring SwiftUI views. The goal of the pattern is to separate the view definition from the business logic behind it. Your views will not depend on any specific model type if done correctly. While MVVM was mostly used in the UIKit/AppKit days, it’s still a commonly used …
Repository design pattern in Swift explained using code examples
The repository design pattern allows you to create an accessible data layer that’s easy to mock for tests. By using common design patterns, you’ll be able to create a consistent project structure, separate concerns, and increase the chances for the project to be easier to understand by outside contributors. One of my favorite design patterns …
Xcode Build Insights: Keep track of project compilation times
Xcode Build Insights lets you keep track of compilation times to ensure your project doesn’t suddenly become slow to build. You’re likely building your project tens of times per day, so compilation times that become slower can significantly impact your overall productivity. While Xcode keeps a history of your builds, it only briefly retains it. …
Solve Missing API declaration using required reason (ITMS-91053)
Apps submitted to the App Store must define API declarations using the required reasons. Apps that don’t will be rejected until they do. This requirement counts for APIs declared in your app’s code and third-party libraries. For the latter, you might be dependent on the library maintainers. While Apple provides rich documentation, it’s hard to …
Statistical significance and its importance with app experiments
Statistical significance tells you whether the result from an experiment is likely attributable to the specific change you did. It’s an essential quantification when running app experiments, and it prevents you from concluding too early about a change you’ve made. I’ve been running hundreds of experiments throughout my career and only a few of the …