Animating changes in UITableView and UICollectionView

Most of our apps present lists or grids of some data by using UITableView or UICollectionView. Often users can update this list by using Pull-to-Refresh technique or by pressing the update button. Everybody knows how to update UITableView by calling the reloadData method on the tableView instance. But what about animation? ReloadData method is invalidating the current items provided by data source and draws new ones without any animation. Today we will talk about animating data changes in UITableView and UICollectionView.

Dependency Injection in Swift with Protocols

There are a lot of third-party libraries which provide Dependency Injection for Swift apps. In my opinion, Swift has a powerful type system which gives us the ability to create type-safe Dependency Injection techniques easily. Today we will talk about creating Dependency Injection in Swift with the power of protocols.

Building complex screens with Child ViewControllers

Container view controllers are a way to combine the content from multiple ViewControllers into a single user interface. Child ViewControllers are one of the undervalued features of iOS SDK. We use it every day by use of UINavigationController or UITabBarController. Last week we talked about using ViewController containment feature to create FlowControllers. But today we are going to discuss how to use this feature to build complex screens.

Navigation with Flow Controllers

Last month I started refactoring navigation flow in my pet project. I’ve been using Coordinator pattern for a while, but now I decide to switch to a more native and simple approach like Flow Controllers. Today we will talk about Flow Controllers and why it is more native than Coordinators.

Hiding third-party dependencies with protocols and extensions

There are plenty of discussions on the Internet about using third-party dependencies in your apps. The first part of developers suggest ignoring the usage of libraries and write all the code yourself. The second part recommends using third-party dependencies to speed up app development.

Pattern Matching with case let

Today we will talk about Pattern Matching, one of my favorite features in Swift. Pattern Matching is the act of checking a given sequence of tokens for the presence of the constituents of some pattern. Swift has a particular keyword for applying Pattern Matching: case let. Let’s dive into examples.

Creating DSL in Swift

This week we will talk about creating DSL in Swift. Let’s start with the understanding of DSL acronym. Domain Specific Language is a language hosted by parent language to solve any specific area. An excellent example of DSL can be HTML which is DSL for creating web page markup.

Using protocols as composable extensions

Today we will talk about using Protocols as composable pieces for our ViewControllers. Protocols and Protocol Extensions are my second favorite Swift feature after Optionals. It helps us to create highly composable and reusable codebase without inheritance. For years we were using inheritance as a gold programming standard. But is it so good? Let’s take a look for simple BaseViewController which we used to have in every project.