If you’ve ever wanted to decode a bunch of JSON data into NSManagedObject instances you’ve probably noticed that this isn’t a straightforward exercise. With plain structs, you can conform your struct to Codable and you convert the struct from and to JSON data automatically. For an NSManagedObject subclass it’s not Read more…
Unit testing is an important skill in the toolbox of any engineer. Knowing how to write a reliable, robust test suite helps you write reliable and robust code. If you’ve followed my introduction to unit testing part one and part two, or if you’re experienced with unit testing you know Read more…
This article covers beta technology and it’s up to date for Xcode 12 beta 3 In WWDC2020’s session Lists in UICollectionView a slide is shown where a UICollectionViewListCell’s separator inset is updated by assigning a new leading anchor to separatorLayoutGuide.leadingAnchor. Unfortunately, this doesn’t work in when you try to do Read more…
This article covers beta technology and it’s up to date for Xcode 12 beta 3 Apple provides several accessory types that you can use to apply certain affordances to a UICollectionViewListCell. However, sometimes these options don’t suit your needs and you’re looking for something more customizable. To add a custom Read more…
This article covers beta technology and it’s up to date for Xcode 12 beta 3 In iOS 14 Apple added the ability for developers to create collection views that look and feel like table views, except they are far, far more powerful. To do this, Apple introduced a new UICollectionViewCell Read more…
This article covers beta technology and it’s up to date for Xcode 12 beta 3 In iOS 14 Apple added the ability for developers to create collection views that look and feel like table views, except they are far, far more powerful. To do this, Apple introduced a new UICollectionViewCell Read more…
This article covers beta technology and it’s up to date for Xcode 12 beta 2 In iOS 14 you can use the new UICollectionView.CellRegistration class to register and configure your UICollectionViewCell instances. So no more let cellIdentifier = "MyCell", no more collectionView.dequeueReusableCell(withReuseIdentifier: "MyCell", for: indexPath) and best of all, you Read more…
A Double and Float are both used to represent decimal numbers, but they do so in slightly different ways. If you initialize a decimal number in Swift using as shown below, the Swift compiler will assume that you meant to create a Double: let val = 3.123 // val is Read more…
Property wrappers are a feature that was introduced in Swift 5.1 and they play a huge role in SwiftUI and Combine which are two frameworks that shipped alongside Swift 5.1 in iOS 13. The community was quick to create some useful examples that were embraced by folks relatively quickly. As Read more…
Swift’s type system is (mostly) fantastic. Its tight constraints and flexible generics allow developers to express complicated concepts in an extremely safe manner because the Swift compiler will detect and flag any inconsistencies within the types in your program. While this is great most of the time, there are times Read more…