How to edit a Swift package in an Xcode project that depends on the package.

This week I want to show you how to use Shape API in SwiftUI. We will take a look at ready to use shapes like Circle, Capsule, Rectangle, etc. We will learn how to draw super custom shapes by using Path and GeometryReader. In the end, we will build BarChart…

In this drag and drop tutorial you will build drag and drop support into UICollectionViews and between two separate iOS apps.

Get started with unit testing in Swift with XCTest. Learn advanced iOS unit testing principles and patterns with this tutorial and sharpen your knowledge by several practical examples.

Error handling in Swift Combine explained by covering operators like mapError, catch, replaceError, assertOnFailure, and how to map to the Never error type.

Some tips on squeezing Swift for speed

Out with #if DEBUG in and in with XCConfig

This article will be the first third of my investigation into Combine, covering an effort to re-implement the three key protocols of Combine: `Publisher`, `Subscriber` and `Subscription`

Thread Sanitizer is now available on Linux as part of Swift 5.1! Head over to Swift.org and grab a Swift 5.1 Development snapshot to try it out.

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Environment is one of the unique features of SwiftUI which we didn’t have before in UIKit. Today I would like to show you all the benefits of using Environment in your apps. Let’s start with describing the idea of Environment. We already discussed it previously…

Learn how Busy Assertion pattern can replace XCTestExpectation when unit testing asynchronous code on iOS in Swift 5.

The data persistence stack that is an appropriate decision today may not be an optimal solution when your app has grown. You would need to design your app to withstand the test of time and be exten…

Get started with the Swift Combine framework in this tutorial. Let's study what are Combine publisher, subscriber, operators, subject and publisher-subscriber life cycle; and implement several examples with the Combine framework in Swift 5.

Recently I have stumbled across a Reddit thread in r/swift, where a user is confused about why the output of his code does not match his expectation : class Member { var memberID: Int? = nil } // Array of "Member" class var members = [Member]() // temporary…