Updating to Swift 4.2

Swift 4.2 is a major release and shipped with Xcode 10. It comes with a lot of code improvements for which the best way to start is to watch the WWDC 2018: What’s New in Swift session. Some of the improvements are easy to implement in your existing code. Replace strongSelf with self SE-0079 makes … 

 

Defer usage in Swift

Although the defer keyword was already introduced in Swift 2.0, it’s still quite uncommon to use it in projects. Its usage can be hard to understand, but using it can improve your code a lot in some places. The most common use case seen around is opening and closing a context within a scope How … 

 

Where usage in Swift

Where is a powerful keyword within Swift to easily filter out values. It can be used in many different variants from which most of them are listed in this post. Usage in a switch Consider having the following enum: enum Action { case createUser(age: Int) case createPost case logout } Using where you can easily … 

 

Typed notifications using custom extensions

The Swift API contains a lot of notifications sent out by the system like NSManagedObjectContextObjectsDidChange in Core Data or the AppDelegate events like UIApplicationDidBecomeActive. Some of these notifications contain rich data in their user info dictionary. Reading the user info data using typed notifications can clean up your code, especially if you use these notifications … 

 

Controlling Progress children by adding remove

Controlling Progress children by default makes it only easy to add children to a Progress instance, but removing is not possible by default. This could have been useful when you want to use a single Progress instance which can have different children over time. Using a custom class MutableProgress makes this possible. Controlling Progress children … 

 

Updating to Swift 4.1

Swift 4.1 is released on the 29th of March and will be shipped with Xcode 9.3. Although it’s a minor language release, it did bring some improvements. How to get started? First of all, Swift 4.1 is source compatible with Swift 4.0. So no need to rush! Before you start, get yourself up to date …