How do you tell if a string is empty in Swift? That depends on what you mean by “empty”. You might mean a string with zero length, or maybe also an optional string that is nil. What about a “blank” string that only contains whitespace. Let’s see how to test…

Calculating diffs in Swift just got a whole lot easier.

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This week, let’s take a look at how well the new 3.0 version of the Swift Playgrounds app for iPad walks the balance between simplicity and power, and how some of its new features really improves the ways it can be used as a highly portable, advanced Swift…

One of my biggest concerns as a developer is how a project is structured. Defining a good and clean architecture with helpful names and nice design patterns is very important. It helps you and other developers to easily understand how different components…

Have you found yourself stuck trying to make sense of a framework or library and wished you could see the source code? Apple does not share the source for UIKit but if the method you are struggling to understand is part of the Swift standard library you are…

Core Data has been in iOS and macOS going back as far as anyone can recall. Nonetheless, there is no widely adopted strategy of storing images and videos in Core Data. In this article let's implement and benchmark most popular Core Data persistence strategies…

Most of our apps are REST clients for some backends. During the development of this kind of apps, we want to keep it working offline. In this case, we have to cache data somewhere locally on the device to make it readable without an internet connection.

I have tried sending push notification to the app running on iPhone and it was sent successfully. But when I upload the app to Testflight for testing, no push notification is shown! Ever encounter the situation above? The reason why the push notification…

Learn the Swift Standard Library analyzing its source code.

A beautiful animation will improve the UX of your app. In this tutorial, we will teach you how to create interactive animation with UIViewPropertyAnimator.

Calculating diffs in Swift just got a whole lot easier.

One of Swift’s greatest features, and one of my favorites, are enums with associated values. The language itself uses them for its fundamentals, like Optional<T>, which either has a .some(T) or is .none. Another example is the new since Swift 5 Result<T,…

Learn how to use an NSBatchDeleteRequest to delete batches in Core Data. Know when not to use it and how to update in-memory managed objects.

Try catch explained. Learn how to catch specific error types with error handling in Swift. Code examples show all possible statements.

Debugging is such an important aspect of any programmer’s life but we usually take it for granted. In this article, I am going to help you…

In a typical iOS app that uses MVC as the architecture, the View Controller has to handle the navigation between other View Controllers…