Learn Swift and iOS Development
Master iOS development through in-depth tutorials and comprehensive courses on Swift, SwiftUI, UIKit, Core Data, and more.
Meet the URLSession Family
In addition to being a class, URLSession is a technology that provides the infrastructure for networking, exposed through a modern and elegant API. In this series, I introduce you to the URLSession stack. You learn how easy it is to get started with URLSession and you discover that URLSession exposes a flexible API that should meet anyone's networking needs.
in Networking
Building the Perfect Core Data Stack With NSPersistentContainer
In June of this year, Apple revealed an impressive list of additions and improvements to the Core Data framework. The NSPersistentContainer class is one of the additions developers have been asking for since the framework was introduced more than a decade ago. The NSPersistentContainer class encapsulates the Core Data stack. Setting up and managing a Core Data stack has never been easier.
in Core Data
Seven Podcasts for Swift Developers
I love podcasts. It is a fantastic medium that continues to grow in popularity. I am subscribed to a bunch of podcasts, ranging from business podcasts to podcasts about development and technology. Today, I list seven of my favorite podcasts for Cocoa developers.
Where to Store a Core Data Persistent Store
Where do you store the persistent store of your Core Data application? If you are using the Core Data stack Xcode created for you, then chances are that you haven't changed the location of the persistent store. In this tutorial, I show you where you can keep the persistent store of your Core Data application and I highlight the pros and cons of each option.
in Core Data
Key-Value Observing (KVO) and Swift 3
Key-Value Observing, KVO for short, is an important concept of the Cocoa API. It allows objects to be notified when the state of another object changes. That sounds very useful. Right?
in Cocoa
What Does the Dynamic Keyword Mean in Swift
You probably know that the Swift language defines a number of attributes, such as objc, escaping, and available. It also defines a range of declaration modifiers.
in Swift
What Is Application Sandboxing
Privacy and security have always been top priorities for Apple. Sandboxing is a result of that commitment. On iOS, applications have been sandboxed from day one. This isn't true for macOS applications. Sandboxing was added to macOS with the announcement of the Mac App Store in 2010.
in Security
Using Fatal Errors to Add Clarity and Elegance to Swift
A few months ago, I stumbled upon a discussion in the thoughtbot guides about the use of fatal errors in Swift. It seems every developer has an opinion about fatal errors and a consensus hasn't been reached yet in the Swift community. The only mention in The Swift Programming Language is in the section that discusses the guard statement and early exit.
in Swift
When Should You Use Implicitly Unwrapped Optionals
When should you use implicitly unwrapped optionals? The short answer to this question is "Never." But the answer is more nuanced than that. Implicitly unwrapped optionals were added to the Swift language for a reason.
in Swift
Build That Application
Do you have a folder on your machine that is filled with unfinished projects? Be honest. I know you do. I have dozens of unfinished projects. Each of these projects started its life as an exciting idea, an idea I absolutely needed to execute on.
in Inspiration
Configuring Table Views With Model-View-ViewModel and Protocols
Yesterday, you learned how to use view models in a view controller that isn't driven by data. We refactored the settings view controller of Cloudy. But there is room for improvement. We are repeating ourselves in the tableView(_:cellForRowAt:) method of the UITableViewDataSource protocol. We can improve this using protocol-oriented programming.
Simplifying Table Views With Model-View-ViewModel
In Mastering Model-View-ViewModel With Swift, we explore how you can use the Model-View-ViewModel pattern to simplify table views. The example we use in the course is Cloudy, a weather application powered by the Dark Sky API. The settings view of the application contains a handful of settings.