The Result enum is available since Swift 5 and allows us to define a success and failure case. The type is useful for defining the result of a failable operation in which we want to define both the value and error output type. The standard Swift library adds more functionality to the result type which …
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Xcode Mark Line to improve readability using // Mark: comments
Xcode Mark Lines allows us to create a better overview of sections within our classes or structs. A so-called mark comment adds both a chapter title and linebreak in the Xcode method navigator. This chapter split makes it easier to quickly navigate through a relative big object. Even-though this technique is great and allows us …
App Launch Time: 7 tips to increase performance
App Launch Time is the time it takes before your app becomes responsive after startup. As the first experience of your user it’s important that it’s smooth and as fast as possible. A slow startup time could mean losing a lot of users which can result in less usage in your app. Even-though today’s devices …
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I’m Antoine van der Lee, an iOS engineer since 2009 and currently a Staff iOS Engineer at WeTransfer. I’ve published new Swift articles weekly since 2019 and curated 200+ newsletter issues and I frequently speak at conferences all around the world. A weekly newsletter containing unique content: I promise I’ll never send you anything besides …
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Welcome, and thank you for joining my newsletter. I’ll make sure to keep you up to date on the latest Swift, SwiftUI, and app development evolution. P.S. Remember to check your email — I just sent you something! Other newsletters I recommend
Data validation on insertion, update, and deletion in Core Data
Data validation in apps is important to make sure we save data conforming to the business rules. A name should be of a certain length and can’t contain invalid characters. It’s tempting to write all this logic in a new “Validator” class while we do a lot of this directly in our Core Data model …
Derived Attributes to improve Core Data Fetch Performance
Derived attributes are available since iOS 13 and aim to improve fetch performance in many different scenarios. Although we have great performance with the latest devices it’s good to be prepared for scaling up to fetching a large number of items from your database. Your memory footprint might look good now but once you start …
Constraints in Core Data Entities explained
Constraints in Core Data are part of an entity configuration. Settings like the entity name and Spotlight display name might be easy to understand while constraints are a bit less known. However, they can be super useful to maintain a unique set of data. Constraints can take away the need to filter out for existing …
NSManagedObject events: handling state in Core Data
An NSManagedObject lifecycle goes from insertion and updates until deletion in the end. All those events come with their own common related modifications and can be used in many different ways. Managing state in Core Data from within the NSManagedObject class itself is a great way to keep logic centralized. Updating a creation date, modified …