SwiftUI provides the type-erased view AnyView that can be used as a wrapper for any other SwiftUI view, for example to be able to return multiple view types from a function. While using AnyView might be a good choice in some cases, Apple recommends using alternatives when possible. That’s because…

Learn how to support multiple languages in your SwiftUI iOS app. — Supporting multiple languages is a common task when developing iOS applications. Xcode and SwiftUI make it easy for us to implement localization. Adding localization to the SwiftUI project To add localization to a SwiftUI project, perform the following steps: Create a new empty file called Localizable.strings in the project. Select the Localizable.strings file and open the…

Learn how to use Swift actors to prevent data races when working with concurrency. — At the WWDC 2021, Apple introduced Swift actors as a new synchronization tool to prevent data races when working with concurrent code. This feature is part of other concurrency developments like Swift’s async/await syntax. Let’s take a look on how Swift actors work to prevent data races. How do Swift actors prevent data races?

Learn how use async/await for asynchronous tasks. — During the WWDC21, Apple introduced the new async/await syntax in Swift version 5.5, allowing us to write asynchronous code in a shorter and safer way. Let’s directly jump into an example and look at a scenario where we are creating a view model that depends on two API requests. The callback solution To…

Learn how to use the Swift Package Manager with Xcode to add dependencies to your iOS project — It was exciting to hear Apple’s announcement of the Swift Package Manager in 2015, entering the world of dependency managers like CocoaPods and Carthage. However, it was not until the release of Xcode 11 in 2019 that Swift Package Manager became a first class citizen for iOS projects by finally…

Learn the basics for using the Core Data framework with SwiftUI in iOS — When it comes to persisting complex data structures in iOS, Apple provides us with the Core Data framework. With Core Data, we can model entities and their relationships, save data for offline use, add undo functionality and more. The easiest way to see how Core Data works with SwiftUI is…

Quick reference and cheatsheet for Swift developers learning Objective-C — Swift is a powerful programming language that was released at the WWDC 2014 as a replacement for Objective-C. But with many existing apps written in Objective-C still out there, knowing or at least having a basic understanding of Objective-C can be useful. This post serves as a quick reference on…

Check your knowledge on automated tests in Swift and iOS — I recently got into the position of leading the technical interviews when my client was searching for a new senior iOS developer. It’s a challenging task to evaluate the skills and knowledge of another developer. In this post, I share my results of the most useful iOS and Swift questions…

Learn to use the power of bitwise operations and option sets in iOS. — Recently, I had to solve the following task at work. The server sends an integer value between 0 and 127 that represents the state of a weekdays selection. When the server sends a 0, no checkbox should be selected. For a 127, all check boxes should be selected. The numbers…