objc.io

We try to improve the performance and energy usage of the marquee view — with mixed results.

Episode 377 · Oct 20

We add smooth velocity transitions to our marquee component and clean up the code.

Episode 376 · Oct 13

We change our marquee animation to a tick-based approach and add a drag gesture.

Episode 375 · Oct 06

We start building a marquee component using SwiftUI's timeline view.

Episode 374 · Sep 29

We implement Catmull-Rom splines to interpolate smoothly between multiple cubic keyframes.

Episode 373 · Sep 22

We add automatic smooth transitions between linear and cubic keyframes.

Episode 372 · Sep 15

We implement the start and end velocity parameters for cubic keyframes.

Episode 371 · Sep 08

We integrate our custom Bézier function from last episode to implement cubic keyframes.

Episode 370 · Sep 01

We start implementing cubic keyframes by defining our own Bézier function.

Episode 369 · Aug 25

We use a timeline view to animate views using our own keyframe implementation.

Episode 368 · Aug 18

We implement the keyframe timeline type and add the possibility of having multiple keyframe types.

Episode 367 · Aug 11

We reimplement SwiftUI's new keyframe-based animations, starting with linear keyframes.

Episode 366 · Aug 04

We continue the macro implementation with generating getters and setters for the observed properties.

Episode 365 · Jul 28

We implement a macro to automatically generate the code necessary for observation.

Episode 364 · Jul 21

We make one-time observation calls work by working with observer IDs.

Episode 363 · Jul 14

We begin reimplementing Swift's new observation mechanism by tracking access to observable objects.

Episode 362 · Jul 07

We explore multiple ways to draw dotted lines between two points in SwiftUI.

Episode 356 · May 19

We refactor our connecting lines code, disentangling the anchor logic from the content.

Episode 355 · May 12

We use SwiftUI's anchors to draw connecting lines between multiple views in the view hierarchy.

Episode 354 · May 05

We refactor our anchor implementation to support transforms like scaling and rotation.

Episode 353 · Apr 28

We continue the anchor implementation, adding support for point anchors.

Episode 352 · Apr 21

We reimplement SwiftUI's anchors to better understand what they do, starting with the bounds anchor.

Episode 351 · Apr 14

We add support for vertical alignment to our Layout protocol-based Flow layout implementation.

Episode 350 · Apr 07

To conclude this series, we render the result of our attributed string builder to a PDF file.

Episode 342 · Feb 10

We add support for Markdown and make it styleable using a custom stylesheet.

Episode 341 · Feb 03

We add support for images and SwiftUI embeds to our attributed string builder.

Episode 340 · Jan 27

We add modifiers to apply various kinds of attributes and integrate Swift syntax highlighting.

Episode 339 · Jan 20

We refactor the attributed string builder to support joining with a configurable separator.

Episode 338 · Jan 13

We begin implementing an attributed string builder to replace the legacy infrastructure for rendering our books.

Episode 337 · Jan 06

We make sure to restore the scroll position when switching tabs while keeping the picker stationary.

Episode 336 · Dec 23 2022

We use our sticky modifier to implement a tabbed scroll view with a sticky picker.

Episode 335 · Dec 16 2022

We improve our sticky header implementation with a nicer API and a subtle bug fix.

Episode 334 · Dec 09 2022

We implement a sticky modifier that makes views in a scroll stick to the top.

Episode 333 · Dec 02 2022

We use an animatable view to control the staggered animation with one common timing curve.

Episode 332 · Nov 25 2022

We use SwiftUI's semi-private variadic view API to create a better interface for our staggered animations.

Episode 331 · Nov 18 2022

We investigate different ways to create staggered animations, starting with delayed animations.

Episode 330 · Nov 11 2022

We clean up the async image caching code from the last episode to end up with a nicer interface.

Episode 329 · Nov 04 2022

We look at two different ways of improving the caching behavior of our AsyncImage implementation.

Episode 328 · Oct 28 2022

We create two versions of our async image implementation for more control over the data's lifetime.

Episode 327 · Oct 21 2022

We tackle the shape of the notch, make the clock auto update, and add the Home indicator.

Episode 326 · Oct 14 2022

We build a view modifier to make any view look like it’s rendered within an iPhone simulator.

Episode 325 · Oct 07 2022

We work on the accessibility of our custom stepper component.

Episode 324 · Sep 30 2022

We make the custom stepper styleable via the environment and create a hold-to-increment/decrement stepper style.

Episode 323 · Sep 23 2022

We introduce a stepper style protocol that allows us to create a wide range of appearances for our custom stepper.

Episode 322 · Sep 16 2022

We start building a custom stepper component and make it adapt to SwiftUI's control size.

Episode 321 · Sep 09 2022

We’re joined by Kasper to take a look at building custom components, beginning with exploring SwiftUI's built-in component styling.

Episode 320 · Sep 02 2022

We use the layout inspection wrapper from the last episode to examine how HStack's layout works.

Episode 319 · Aug 26 2022

We use SwiftUI's new Layout protocol to inspect the proposed and reported sizes in the layout process.

Episode 318 · Aug 19 2022

On selection of a search result, we jump to the relevant page and highlight the search term.

Episode 317 · Aug 12 2022

We add a search field to our SwiftUI workshop app and prepare the content to be searchable.

Episode 316 · Aug 05 2022

We add a search field to our SwiftUI workshop app and prepare the content to be searchable.

Episode 315 · Jul 29 2022

We clean up the code of the last few episodes by splitting our large view into smaller parts.

Episode 314 · Jul 22 2022

We implement some vector math to calculate the initial animation velocity from the drag gesture.

Episode 313 · Jul 15 2022

We lay the foundation for using a spring animation with the initial velocity for the drag gesture.

Episode 312 · Jul 08 2022

We add a drag gesture to close the detail view when it's being pulled down.

Episode 311 · Jul 01 2022

We add smooth animations from the photo grid to the detail view and back.

Episode 310 · Jun 24 2022

We start to build a photo grid view like in the stock Photos app, including gestures and transitions.

Episode 309 · Jun 17 2022

We take a first look at SwiftUI's new Layout protocol and integrate the flow layout we previously built.

Episode 308 · Jun 10 2022

We build a UI for creating chains of async algorithms and visualizing the results.

Episode 307 · Jun 03 2022

We refactor our code to support combining multiple async algorithms.

Episode 306 · May 27 2022

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

Episode 305 · May 20 2022

We add drag gestures to make the input streams interactive.

Episode 304 · May 13 2022

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

Episode 303 · May 06 2022

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

Episode 302 · Apr 29 2022

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

Episode 293 · Feb 25 2022

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

Episode 292 · Feb 18 2022

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

Episode 291 · Feb 11 2022

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