SwiftUI First Look: Building a Simple Table View App
WWDC 2019 was one of the more exciting keynotes in terms of advancements in developer tools. One of the biggest and the best announcements was the release of SwiftUI. SwiftUI is a brand new framework that allows you to design and...
RESTful API Tutorial: How to Upload Files to a Server
Welcome to a new, hopefully exciting tutorial! In a previous post I showed to you the process of creating a custom class that manages web requests and RESTful APIs. Today, we will keep building on it, as I would like to focus on...
Advanced Animations with UIViewPropertyAnimator
Animations are cool. They are an important part of iOS Human Interface Guidelines. Animations help you to draw user’s attention to important things or just add some fun to your app. There are few ways to implement animations in...
How to Resolve “Couldn’t instantiate class named WKWebView” Error When Using WebKit
I got a question from a reader about the following error when using WKWebView in storyboard: Could not instantiate class named WKWebView because no class named WKWebView was found; the class needs to be defined in source code or...
How USDZ Enables New Experiences for ARKit
At WWDC 2018, Apple announced various improvements to its support for Augmented Reality experiences and one of those was the support of a new file format, USDZ. USDZ enables new experiences and adds new ways in which users can...
macOS Programming Tutorial: Working with Custom Views and Cocoa Controls
Great apps have great user interfaces, and chances to build a great interface entirely inside the views of the view controllers in the storyboard file(s) are small. Usually, complex views are being designed in separate Xib...
How to Add Apple Pencil Support to your iPad Apps
In October 2018, Apple announced the brand new iPad Pro and the all-new Apple Pencil 2.0. Unlike the previous generation of the Apple Pencil, this utensil offers developers some extra fun APIs to play around with in order to...
RESTful APIs Tutorial: Creating Your Own Lightweight REST Library in Swift
Most applications nowadays communicate with servers to exchange data, and they do so by consuming RESTful APIs, also called RESTful web services. Using REST, applications can send requests to servers, and servers send responses...
How to Use Git Pull Requests to Improve Code Quality and Developer Participation
Today, we’ll talk about a feature of several well-known Git tools that I prefer to call a “merge request,” but tends often to be referred to as a “pull request,” for example, on sites like GitHub and...
Interview with Steven Chan, Founder of GoodNotes: How He Turned an App Idea into a Profitable Business
In his last semester of university, Steven Chan registered for as many bird courses as possible and staked all his efforts into a new app. Since then, he has built his product GoodNotes into an award-winning app featured on...