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Core Data Aggregate Functions

Learn from a Google Developer Expert: Core Data is a beautifully designed object mapping and persistence framework -- big kudos to the Apple engineers.

This tutorial zooms in on an important topic for anyone working with Core Data, faulting. Faulting is a concept that often confuses developer new to Core Data. Before I explain what faulting is, I want to show it to you.

Code generation using Swift Package Plugins

How to build a Swift Package Plugin to automatically generate unit tests from input Swift files.

When to Use Combine's Filter and CompactMap Operators

Combine's filter and compactMap operators share a few similarities and it is possible to use them interchangeably in some scenarios. That said, there are a number of key differences we discuss in today's episode of Combine Essentials.

Variable WidgetBundle configuration based on conditions

Use control flow statements inside a WidgetBundle to return a different set of widgets base on a if-statement condition.

@ViewBuilder usage explained with code examples

The @ViewBuilder attribute allows you to create compact code and improve readability. SwiftUI forces you already to use the result builder.

SwiftUI MVVM clean architecture

In this tutorial I will try to present you how to use clean, testable and maintainable architecture when using SwiftUI. We start with diagram depicting this architecture and then we dive deep into…

Save Custom Codable Types in AppStorage or SceneStorage

Add RawRepresentable conformance to a custom type that represents a setting or a view state in SwiftUI to be able to save it in AppStorage or SceneStorage.

How to create custom SF Symbols with Sketch

Since Apple introduced SF Symbols in 2019, many product designers for iOS, including myself, have been asking themselves when it will

The Ultimate Guide to the SwiftUI 2 Application Life Cycle

Everything you need to know about the new application life cycle in SwiftUI 2

Avoiding singletons in Swift

There seems to almost be a consensus in the community that singletons are

Dependency injection using factories in Swift

Dependency injection is an essential tool when it comes to making code more testable. This week, let's take a look at a dependency injection technique that lets us enable testability without forcing us to write massive initializers or complicated dependency management code.