Codakuma
iOS apps and more

Posts

Adding privacy-first analytics to Personal Best

Intro

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Adding polylines to maps in SwiftUI

As of March 2021, SwiftUI has a built-in map view but it’s quite simple, only supporting basic annotations.

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Adding haptic feedback to buttons in SwiftUI

Haptic feedback is a huge part of iOS and many apps use it well to add subtle feedback to certain actions.

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Accessing the photo library in SwiftUI

SwiftUI doesn’t yet have an easy way to access the camera or photo library. hackingwithswift.com already has a great tutorial on how to access the camera from SwiftUI.

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Using DispatchGroup in Swift for asynchronous loops

Occasionally in an iOS app you’ll do something asynchronous, calling a completion handler when it’s done, like this:

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Making your own errors in Swift

Swift’s Error protocol is commonly used across Apple’s APIs to represent failure states.

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Going indie: 2020 in review

Note: This post has embedded tweets which may set cookies. The rest of this website doesn’t use cookies at all.

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Creating images from SwiftUI views

Recently while developing a workout sharing feature for my app Personal Best, I needed to figure out how to turn a SwiftUI view into an image that people could share.

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Static maps in SwiftUI with MKMapSnapshotter

Since iOS 14, SwiftUI has included components for adding maps to your apps.

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Optional view arguments in SwiftUI

I came to SwiftUI from the React world, where it’s common to pass views (components in React terminology) to other views:

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Declaring unnamed arguments in SwiftUI

Swift has long had the ability to omit argument labels to aid readability:

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Adventures in SwiftUI 2's MapKit support

SwiftUI 2 comes with a Map component, for displaying views from Apple Maps in your apps.

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iOS 14's bizarre text casing behaviour in List headings

Here’s a SwiftUI list with a section header:

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Multiline text in SwiftUI

I keep running into an issue in SwiftUI where some text truncates where I don’t expect it to. Here’s an example from Personal Best’s onboarding screen:

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Building a more generic page control in SwiftUI

Note: This article was written for iOS 13. iOS 14 has support for page controls built in. There is also now iPages, a great third-party library you can use for this.

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SwiftUI view modifers and dark mode

In SwiftUI, you can achieve most UI needs without ever explicitly checking for dark mode, thanks to semantic colours built into the platform and the ability to define our own semantic colours that automatically adapt to dark mode.

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Personal Best 3

I know, I know. Two major version bumps in seven days. It wasn’t intentional.

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Earliest sample dates in HealthKit

When building a watchOS extension for my iPhone app Personal Best, I couldn’t figure out why querying the HealthKit store for workouts was only returning 25 results, as opposed to over 700 on iPhone.

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Running HealthKit queries in the background

Recently I’ve been trying to use HKObserver to monitor queries from HealthKit in the background. I wrote a simple integration where my app would print to the console every time a new workout was recorded. However, it was never triggered, except when I opened my app in the foreground.

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Personal Best 2

Personal Best started as a small project to learn SwiftUI and ship an app. I never really intended to ship a 2.0, I figured it would just be a fun proof of concept I could share with my friends.

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Making SwiftUI navigation bar buttons bigger

Apple’s human interface guidelines specify that tap targets should be at least 44x44pt to ensure they’re easily tappable.

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SwiftUI sheets and environment objects

@EnvironmentObject is handy for passing data between views in SwiftUI. Hacking With Swift has an excellent guide on how to use it, but when I followed it, one some of my views it just wasn’t working correctly.

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