Recent articles

When you have an Array of elements, and you want to drop all elements that don’t match specific criteria from the Array, you’re looking for Array’s filter(isIncluded:) method. Let’s say you have an array of words and you only want to keep the words that are longer than three characters: let words = ["hello", "world", […]

We all write the dreaded // TODO: and // FIXME: comments every once in a while. Sometimes we do it because we know our code can be better but we’re not sure how, other times we don’t have the time to write an optimal solution because of deadlines, and other times we just want to […]

The Combine framework. Silently introduced, yet hugely important for iOS. It didn’t get any attention during the big Keynote at WWDC 2019, but as soon as folks were in the sessions they knew that Combine was going to be huge. It implements a Functional Reactive Programming (FRP) paradigm that’s similar to that of Rx which […]

Swift grants developers the ability to shadow certain types with an alternative name using the typealias keyword. We can use this feature to create tuples and closures that look like types, or we can use them to provide alternative names for existing objects. In this post, we’ll look at five ways in which typealiases can […]

You can reverse an Array, and any other Collection in Swift using the reverse method. For example var input = [1, 2, 3] print(input) // [1, 2, 3] input.reverse() print(input) // [3, 2, 1] The code above takes an array (input) and reverses it in-place using the reverse() method. This only works if your array […]

It’s the end of the year, and that means that we should all take a little bit of time to reflect on the past year. Some people like to reflect on their past year in a very statistical manner, they set measurable goals and they decide whether they met their goals at the end of […]

You’ve done all the work to build your app, your UI looks amazing, animations are smooth and you’re ready to put your app in the hands of other people. Maybe you’re even ready to start offering your app on the App Store! This is a huge achievement if you are currently at this stage in […]

For years I have had a bit of a love and hate relationship with Storyboards. I love how easy they make it for me to set up my AutoLayout constraints, but they can quickly grow unwieldy and for large projects with multiple developers Storyboards are hard to use because of merge conflicts that occur when […]

Ever since iOS 6, developers have been able to use collection views and to build interesting custom layouts by subclassing the UICollectionViewLayout or UICollectionViewFlowLayout classes. I even wrote an article about building custom collection view layouts a while ago. Today, I would like to introduce you to a new way of defining collection view layouts […]

At WWDC 2019 Apple announced a couple of really cool features for table views and collection views. One of these cool features comes in the form of UITableViewDiffableDataSource and its counterpart UICollectionViewDiffableDataSource. These new diffable data source classes allow us to define data sources for collection- and table views in terms of snapshots that represent […]