objc.io

We add support for more algorithms, like zip and combineLatest, and clean up our code.

Episode 305 · May 20

We add drag gestures to make the input streams interactive.

Episode 304 · May 13

We transform arrays of events into async streams, run the merge algorithm on them, and visualize the result.

Episode 303 · May 06

We start a new project to visualize the algorithms from the new Swift Async Algorithms package.

Episode 302 · Apr 29

We use type-level programming to specify the alignment for each level of the tree diagram separately.

Episode 293 · Feb 25

We use a custom alignment ID to control the positioning of parent nodes in our tree.

Episode 292 · Feb 18

We prepare a tree diagram view in SwiftUI to experiment with advanced alignment techniques.

Episode 291 · Feb 11

We show how animations in SwiftUI are implemented using transactions.

Episode 285 · Dec 17 2021

We detect the dates in our graph that are onscreen and use this to control a date picker.

Episode 280 · Nov 12 2021

We refine our graph view and add the ability to programmatically control the scroll view.

Episode 279 · Nov 05 2021

We start building a scrolling graph view that can display large amounts of data smoothly.

Episode 278 · Oct 29 2021

We finish our reimplementation of the matched geometry effect and discuss the discrepancies between SwiftUI's variant and ours.

Episode 260 · Jun 25 2021

We continue to work on our matched geometry implementation, adding the ability to the position as well as the size.

Episode 259 · Jun 18 2021

We look at SwiftUI's new AsyncImage API and reimplement it using async/await.

Episode 258 · Jun 11 2021

We start reimplementing SwiftUI's matched geometry effect to gain a better understanding of how it works.

Episode 257 · Jun 04 2021

We complete the pinch to open and pinch to close transitions from the last episode.

Episode 256 · May 28 2021

We combine magnification gestures with matched geometry effects to create smooth transitions.

Episode 255 · May 21 2021

We look at a technique similar to SwiftUI's ScrollViewReader to access the underlying MKMapView of a SwiftUI map.

Episode 254 · May 14 2021

We revisit our SwiftUI flow layout implementation from 1.5 years ago and write a simpler and more correct version.

Episode 253 · May 07 2021

We implement a row of buttons with equal widths and dynamic content based on the available space.

Episode 243 · Feb 26 2021

We implement a horizontal bar chart with labels at both ends of the bars.

Episode 242 · Feb 19 2021

We implement a real-world layout that looks simple but is not so simple in SwiftUI.

Episode 241 · Feb 12 2021

We create a wrapper view to easily test animations with previews.

Episode 240 · Feb 05 2021

We refactor our SwiftUI views to be testable in previews without mocking the model.

Episode 239 · Jan 29 2021

We provide the current slide number and total slide count via the environment and display them in the footer.

Episode 222 · Sep 25 2020

We add custom animations and use SwiftUI's matched geometry effect for animations between slides.

Episode 221 · Sep 18 2020

We create a wrapper view for slide headers that allows us to style all headers via the environment.

Episode 220 · Sep 11 2020

We scale our slides to fit any screen size and use SwiftUI Previews to render previews of all slides.

Episode 219 · Sep 04 2020

We implement a custom function builder to enable writing slides with the same syntax as SwiftUI views.

Episode 218 · Aug 28 2020

We start building a SwiftUI library for creating presentation slides.

Episode 217 · Aug 21 2020

We rebuild the model layer with structs instead of classes and use bindings to provide mutable access to the views.

Episode 202 · May 08 2020

We use published properties and property observers to clean up our model code, and we fix some issues on the iPad.

Episode 201 · May 01 2020

We take a callback-based model API and refactor it into an observable object.

Episode 200 · Apr 24 2020

We create a lazy wrapper for observable objects and use dynamic member lookup to ease its use.

Episode 199 · Apr 17 2020

We wrap a UIKit alert in a SwiftUI-like API to present an alert with a text field.

Episode 198 · Apr 10 2020

We continue working on the recording and playback screens while reusing existing model and helper classes from the MVC app.

Episode 197 · Apr 03 2020

We start to implement the MVC sample app from our App Architecture book in SwiftUI reusing the original model.

Episode 196 · Mar 27 2020

We wrap an MKMapView, using a diff on the annotations to properly animate insertions and removals.

Episode 195 · Mar 20 2020

We create a view that automatically scales a text view to fill the available space.

Episode 194 · Mar 13 2020

We add labels to the analog clock face, and we make it configurable to reuse it for counting the minutes.

Episode 193 · Mar 06 2020

We draw an analog clock face and add moving pointers.

Episode 192 · Feb 28 2020

We add lap times to the model, show them in a list, and highlight the shortest and longest laps.

Episode 183 · Dec 20 2019

We add the data model for the stopwatch to make it functional.

Episode 182 · Dec 13 2019

We enable our stopwatch buttons to self-size to fit their labels.

Episode 181 · Dec 06 2019

We use a custom button style to imitate the appearance of the stopwatch buttons on iOS.

Episode 180 · Nov 29 2019

We refactor our use of geometry readers and preferences to make our code more expressive.

Episode 179 · Nov 22 2019

We implement the drop functionality and work around several obstacles we encounter along the way.

Episode 178 · Nov 15 2019

We make our shopping cart interactive by adding drag and drop.

Episode 177 · Nov 08 2019

We use a view modifier with local state to animate views onto the screen.

Episode 176 · Nov 01 2019

We use anchors, preferences, and transitions to animate items from a grid into a cart.

Episode 175 · Oct 25 2019

We examine SwiftUI's animation curves using a custom view modifier.

Episode 174 · Oct 18 2019

We explore SwiftUI's rendering and animation model while building a shake animation.

Episode 173 · Oct 11 2019

We use drag gesture recognizers to add reordering capabilities to our SwiftUI collection view.

Episode 169 · Sep 13 2019

We implement single-line and flow layouts for our SwiftUI collection view.

Episode 168 · Sep 06 2019

As a first step toward a collection view, we enable child views to communicate their sizes to a parent view.

Episode 167 · Aug 30 2019

We further refine the animation from last episode and refactor it using a geometry effect.

Episode 166 · Aug 23 2019

We start building a custom animation of a shape that moves along a path.

Episode 165 · Aug 16 2019

We experiment with paths and shapes to create a triangular preview badge.

Episode 164 · Aug 09 2019

We integrate Apple's web authentication framework to enable logging in with GitHub and then store the credentials using a keychain property wrapper.

Episode 163 · Aug 02 2019

We create a two-way binding from the play position of the video player to a bindable model object.

Episode 162 · Jul 26 2019

We integrate an AVPlayerViewController, expose its play state as a binding, and use a SwiftUI view as an overlay.

Episode 161 · Jul 17 2019

We look at different ways to load data from the network less eagerly.

Episode 160 · Jul 12 2019

We explore different approaches to passing data around in our SwiftUI app.

Episode 159 · Jul 05 2019

We start building a Swift Talk app using SwiftUI.

Episode 158 · Jun 28 2019

We integrate the tiny networking library into a SwiftUI project and wrap AppKit's progress indicator in a SwiftUI view.

Episode 157 · Jun 21 2019

We build a simple currency converter to experiment with SwiftUI's state-driven view updates.

Episode 156 · Jun 14 2019