Intro to free functions in Swift
Functional programming might be a strange beast for Cocoa veterans. This tutorial helps to understand how & why you should compose functions together.…
Animating UICollectionView updates with self-sizing cells the Rx way
UICollectionView is one of the most flexible and powerful, but also mysterious and tricky components in UIKit toolbelt. I've learned it the hard way when trying to build a simple, Facebook-like feed. Here're my lessons learned.…
Imperative shell, functional core
Imperative shell, functional core is one of the concepts that influenced my programming career the most. It perfectly formulates how to write clean, easily testable code and always keeps you wondering whether you did enough to extract the functional pieces. During my preparations for the Mobile Warsaw #62 talk I…
Practical functional programming in Swift
Recently, I came across a couple of real-world examples that illustrate functional programming usage in Swift. All those examples have a single thing in common - they have been initially written in an imperative manner, which made them harder to read and extend. The article provides an in-depth description of…
UIView providers for Swift unit testing
As you might already know, I deliberately chose not to use storyboards for my Swift code. Instead, I build all of the views programmatically and inject them through initializers into suitable controllers. Although this approach works really nice, it has drawbacks when it comes to unit testing. Imagine having a…
Adding iMessage integration to your app
So you already have an app and you are trying to engage users even more... What is a better way to do that than using one of the coolest iOS 10 features - iMessage integration? This Tuesday Apple rolled out iOS 10 together with Messages framework. It provides building blocks…
UI database bindings with Realm & ReactiveKit
UITableView is truly a heart of iOS user interface. It does not matter whether you are changing settings, going through unread emails or sending messages. Provided that you have used your iOS device recently, it is almost certain that you have stumbled upon a table view. Rendering a table with…
To storyboard or not to storyboard?
Storyboards are known to "divide" iOS developers since their introduction in iOS 5. Almost five years have passed and the consensus about when to (not) use them still remains. It is probably because of the fact that using storyboards has as many benefits as drawbacks[1] so it…