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Persistence prevails: Dave shares his iOS developer journey After watching Dave Jacobsen’s story on YouTube, I found myself asking, “When would I have given up if I were in Dave’s shoes?” He shares about the...

Whyyy would I need an old version of Xcode? Valid question – it’s not often you’ll need one. Two reasons off the top of my head though: 1) To compare with your previous experience Perhaps you’re just wanting to...

Developing for iOS is a valuable and in-demand skill, but if you haven’t developed in the Apple world before, it can be surprisingly different. In this course, iOS 14: Getting Started, you’ll quickly get up and running using...

This is merely a breadcrumb for finding the Apple Developer documentation page where all of the possible SwiftUI Environment keys are listed. Resources Apple Documentation ➡️ SwiftUI ➡️ State and Data Flow ➡️ EnvironmentValues

June is an invigorating time for iOS developers worldwide. Invigorating… And exhausting. Me personally? The flurry of new-ness often has me feeling overwhelmed. WWDC - The Worldwide Developer Chase When it comes time for WWDC,...

Manually Testing StoreKit Code Development Workflow Changes The previous workflow for setting up in-app purchases was a bit disjointed. You’d have to create your app in Xcode… then jump out to App Store Connect to define...

Monetizing apps is challenging. In this course, Implementing In-App Purchases on iOS, you’ll learn to offer digital products and services directly within your app as in-app purchases. Resources Implementing...

Setting the stage with a use case for checking the original_application_version The task appears to be simple. Suppose that… You have an existing app on the app store that’s currently at version 1.2 You want to shift to...

Privacy Notice This privacy notice discloses the privacy practices for and applies solely to information collected by the following websites and apps (SERVICE): www.andrewcbancroft.com Ten Read Ten Said This page is used to inform...

CPU cannot execute an instruction Sometimes we developers don’t play fair with the CPU. Suppose that I wrote some code that ended up telling the CPU to divide by zero. That’s… impossible… for you and the...

Never change code without reproducing the problem first Reproducing the problem is a critical first step in debugging. Before you start scouring your code… Before you start setting breakpoints… Before you start using tools...

Does it ever help you to narrow the scope of overwhelming topics like “debugging”? It helps me. When you’re new to something like iOS development, you may find yourself stepping into a world of problems. Everyone...

Bugs are bound to happen. Getting rid of them is an essential skill if you want to keep your sanity when building apps. In this course, you will learn a set of thinking skills to couple with the fundamental tools that Xcode provides you...

Once you’ve passed an NSManagedObjectContext instance to your SwiftUI View, you’ll need to pull data out of your Core Data persistent store with a fetch request. First Things First The remainder of this how-to assumes that...

Step one to using Core Data with SwiftUI is to initialize the Core Data stack and pass an instance of your NSManagedObjectContext to your view. First Things First The remainder of this how-to assumes that you’ve already got a way...

How does Apple intend for us to use Core Data with SwiftUI? They gave us a path forward with the most recent beta release of iOS 13 (Beta 5 at the time of this writing)! Resources Blog Idea List SwiftUI Example Xcode Project ...

NSPersistentCloudKitContainer is brand new with Xcode 11 and iOS 13. It works… kind of… sometimes… I’m keeping this list of buggy behavior to help keep my head straight. I’ve also filed bug reports on...

Resources SwiftUI Essentials Tutorials as Playgrounds Apple’s SwiftUI tutorials Why Playgrounds? I’ve been making my way through Apple’s SwiftUI tutorials. If you’re anything like me, you learn by...

Imagine writing some Swift code. You want to share it across multiple apps, so you build a framework. You compile it with the Swift 4.0 compiler. Now imagine Apple announces Swift 4.1. Sweet! You decide to build a new app and compile...

If you constantly run the same set of commands at the command line, why not automate that? I found myself typing the same things over and over to deploy this website. Here’s how I encapsulated it into a script that saves me...

“ABI” stands for “Application Binary Interface”. The word “interface” means the same as it does in other places where you hear the word. If a human wants to interact with a computer, s/he needs a way...

Apps aren’t “dumb”. Apps do things. Smart things. The question is: Where do the “smart parts” go? So how you smart or how dumb should NSManagedObject subclasses be? What code should you write in one of...

Setting the Stage Suppose one of the NSManagedObject subclasses from your Core Data data model looked like this: 1 2 3 4 5 6 public class BlogIdea: NSManagedObject { @NSManaged public var ideaTitle: String? @NSManaged public...

If you’re looking for a quicker way to iterate while you’re building SwiftUI views, and you don’t have macOS Catalina installed, you might enjoy the Playground experience more than you enjoy pressing command + R every...

First Things First In order to use NSPersistentCloudKitContainer in your app, you need to be targeting iOS 13+. The CloudKit syncing portion only works on physical devices (not in the simulator). That being the case, you’ll need...

A new SceneDelegate was introduced for Storyboard-based apps in iOS 13, and with it came some changes in how you’re able to access your app’s root view controller at app launch. The Old Way AppDelegate Swift file used to be...

Capabilities Search In your project settings, you can search for capabilities you want to add (instead of scrolling down the list and turning things “on” or “off”). Editor Quick Actions Holding the command key...

You’ve done the work to get your Core Data model ready, but right when you hit run, wham. Your debug output log shows: Failed to load model named ModelName You you may experience one of these when you attempt to access your...

Resources Using Core Data With CloudKit - WWDC 2019 Session 202 Sample Project from Apple How NSPersistentCloudKitContainer Helps I suppose the first question everyone should ask is, “What’s the big deal? How...

“Declarative” is one of Swift UI’s four core principles. Aside from taking for granted that declarative is just “better” than whatever else, how about a visual to understand the declarative way of...

Resources Tutorial Reference Enabling SwiftUI Opting in to using SwiftUI is as easy as creating a new project with Xcode 11 and clicking the “Use SwiftUI” checkbox. Starting Point Xcode will give you two structs...

Resources Right-click -> Save as… Swift Playground Setup 1import UIKit 2import PlaygroundSupport 3 4class MyViewController : UIViewController { 5 6 var currencyLabel = UILabel() 7 override func...