Learn more about Combine

In my previous post you learned about some different use cases where you might have to choose between an async sequence and Combine while also clearly seeing that async sequence are almost always better looking in the examples I’ve used, it’s time to take a more realistic look at how you might be using each […]

Swift 5.5 introduces async/await and a whole new concurrency model that includes a new protocol: AsyncSequence. This protocol allows developers to asynchronously iterate over values coming from a sequence by awaiting them. This means that the sequence can generate or obtain its values asynchronously over time, and provide these values to a for-loop as they […]

The biggest features in Swift 5.5 all revolve around its new and improved concurrency features. There’s actors, async/await, and more. With these features folks are wondering whether async/await will replace Combine eventually. While I overall do not think that async/await can or will replace Combine on its own, Swift 5.5 comes with some concurrency features […]

If you’ve worked with Combine in your applications you’ll know what it means when I tell you that you should always retain your cancellables. Cancellables are an important part of working with Combine, similar to how disposables are an important part of working with RxSwift. Interestingly, Swift Concurrency’s AsyncSequence operates without an equivalent to cancellable […]

When Apple announced their own Functional Reactive Programming framework at WWDC 2019 I was super excited. Finally, a simplified, easy to use framework that we could use to dip our toes in FRP. What made it even better is that SwiftUI makes heavy use of Combine, which means that Apple had to buy in to […]

I love posts where I get to put write about two of my favorite frameworks at the moment; Combine and Core Data. When you’re working with Core Data, it’s common to perform save operations asynchronously using a background context. You could even perform an asynchronous save on the main managed object context. Consider the following […]

Refreshing access tokens is a common task for many apps that use OAuth or other authentication mechanisms. No matter what your authentication mechanism is, your tokens will expire (eventually) and you’ll need to refresh them using a refresh token. Frameworks like RxSwift and Combine provide convenient ways to build pipelines that perform transformation after transformation […]

Remote configuration is a common practice in almost every app I have worked on. Sometimes these configurations can be large and the implications of a configuration change can be far-reaching while other times a configuration is used to change the number of items shown in a list, or to enable or disable certain features. You […]

A common pattern in Core Data is to fetch objects and show them in your UI using one managed object context, and then use another context to update, insert or delete managed objects. There are several ways for you to update your UI in response to these changes, for example by using an NSFetchedResultsController. I […]

When you’re using Combine for an app that has iOS 13 as its minimum deployment target, you have likely run into problems when you tried to apply a flatMap to certain publishers in Xcode 12. To be specific, you have probably seen the following error message: flatMap(maxPublishers:_:) is only available in iOS 14.0 or newer. […]