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Toomas Vahter

Sidebar layout on macOS in SwiftUI

A common UI layout on macOS has a sidebar and detail view side by side. The sidebar contains a list of items, where the selected item is displayed on the right and displays details of it. One would expect that creating such a view hierarchy in SwiftUI should be pretty easy to set up. In this post, we’ll take a look at how to create a basic view with sidebar which supports selection. Building the layout We’ll build a simple sample app which shows a list of fruits in the… Read more Sidebar layout on macOS in SwiftUI

Adding async await to existing completion handler based code

Xcode 13 with Swift 5.5 toolchain brings async-await to the Swift language. The aim of this blog post is not to cover everything it brings, but instead concentrate on seeing how completion handler based code can be wrapped with async await. In the end, we have reused existing code but made it available to be called from async task contexts. For demonstrating this, we’ll take my IndexedDataStore Swift package and add async await supported methods to existing completion handler based API. The IndexedDataStore package has async methods for loading data… Read more Adding async await to existing completion handler based code

Flow layout with self-sizing items and fixed spacing in UIKit

One of the really common layouts I have needed to implement with collection view is a simple flow layout but with fixed spacings. Apple provides us UICollectionViewFlowLayout, but the sad part is that it has dynamic spacing between items. Everything is there but not quite. Before UICollectionViewCompositionalLayout, one needs to create a subclass of the flow layout and then fixing spacings manually, which is pretty cumbersome to do. Therefore, let’s instead see what it takes to implement a simple self-sizing flow layout with fixed spacings when using UICollectionViewCompositionalLayout. The end… Read more Flow layout with self-sizing items and fixed spacing in UIKit

Height fitting collection view

I have numerous times needed to show some sort of collection view which adjusts its height based on the content. Most of the time it has been a dynamic list within some more complex scrollable UI. Therefore, in this post, we’ll take a look at how to set up a collection view which has its height set to the content height. On the screenshot below, we have a collection view with light grey background and two sections. The approach for making this working is pretty simple, which involves adding a… Read more Height fitting collection view

Signal Path 2.6 for macOS, iOS and iPadOS

Signal Path version 2.6 is out. Signal Path now supports wav files in addition to the existing raw IQ data format. Audio recordings are now saved as wav files, and it means that audio recordings can be played with other music player apps. Additionally, some audio quality issues related to playing audio recordings were fixed along with it.

Image converter with AsyncSequence

WWDC’21 brought us a new protocol named AsyncSequence. As the name stands, it represents a sequence of asynchronous elements. For trying out the new API we’ll build a tiny ThumbnailSequence which takes in a list of image names and by iterating the sequence, we’ll get back scaled thumbnails for those image names one by one. The image scaling runs on a background thread. The AsyncSequence protocol comes with two associated types: Element and AsyncIterator. Element represents the type which is produced by the sequence, and AsyncIterator is the type responsible… Read more Image converter with AsyncSequence

Requiring min code coverage in Swift packages with GitHub actions

I have written before about running tests and getting code coverage data for Swift packages in Running tests in Swift package with GitHub actions and Code coverage for Swift Packages with Fastlane. In this post, I am going to revisit the problem and use only tools from Xcode: xcodebuild and xccov. One downside of the approach in Code coverage for Swift Packages with Fastlane is that it required to generate Xcode project which is a deprecated feature in Xcode 12.5, and also it used xcov for forcing code coverage which does not seem… Read more Requiring min code coverage in Swift packages with GitHub actions