Author Archives: Matteo Manferdini

JSON Decoding in Swift with Codable: A Practical Guide

 JSON Decoding in Swift with Codable: A Practical Guide

Encoding and decoding data is a fundamental part of iOS apps.

That is especially true for the JSON data we get from REST APIs.

In the past, decoding JSON in iOS apps required a lot of boilerplate code and sometimes fancy techniques.

But thanks to the Codable protocols introduced of Swift 4, today we have a native and idiomatic way to encode and decode data.

The Codable protocols allow for simple JSON decoding that can sometimes take only a couple of lines of code. But they also allow for more sophisticated techniques when you have special needs.

We will explore all that in this article.

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The Essential Guide to Unit Testing in iOS

The Essential Guide to Unit Testing in iOS

Many developers find unit testing confusing. This is made worse by the advanced techniques you need to test classes or asynchronous code, like the one for network requests.

In reality, at the base of unit testing, there are simple fundamental concepts. Once you grasp those, unit testing suddenly becomes more approachable.

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Master Swift Generics: A practical guide to code reuse

Master Swift Generics: A practical guide to code reuse

Generics are a great feature of Swift that allow you to generalize and reuse code in ways that would not be possible otherwise.

They are also a quite advanced feature and become a roadblock for many developers. The iOS SDK uses generic extensively, something that is especially true in SwiftUI.

In this article, I will show why generics exist and how to use them in your apps.

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A Practical SwiftUI Kickstart

A Practical SwiftUI Kickstart How to Create Complete iOS App Interfaces

SwiftUI is a revolutionary way to create user interfaces on iOS and other Apple platforms.

It introduces a new declarative syntax that allows you to build user interfaces packed with features quickly.

In this article, I will show you an overview of the SwiftUI features you will need in every iOS app you will ever build.

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Weak Self in Swift Made Easy: What it is and why it’s needed

When developing iOS apps in Swift, you are bound, sooner or later, to encounter weak self references. That’s especially true in the callbacks of network requests.

At first, weak self references might seem puzzling and, sometimes, annoying. In this article, we will see why they are needed and how you can fix them in your code.

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Model-View-Controller in iOS: A Blueprint for Better Apps

Model View Controller in iOS A Blueprint for Better Apps

Since the introduction of SwiftUI, I have seen many developers write all their code inside views. Unfortunately, the simplicity of the framework seems to encourage a return of many poor practices.

But you do not build robust, maintainable apps by gluing together random pieces of code.

Sure, you can search on Google for specific tasks, copy and paste some code into your project and make it work, somehow.

That works if your app is small and simple. But as soon as you go beyond basic tutorials, you inevitably get serious problems.

That’s why the MVC and MVVM patterns exist. In this article, we will see how they apply to SwiftUI.

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