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The lectures for the Spring 2020 version of Stanford University's course CS193p (Developing Applications for iOS using SwiftUI) were delivered to our students in an on-line fashion due to the novel coronavirus outbreak.  Stanford has made these lecture videos available to all by posting them on its YouTube channel (links below).  This website was set up to give everyone access to the supporting material that was distributed to students during the quarter (homework, demo code, etc.).

For more, check out the About page.

Demo Screen Capture
Lecture 1

Course Logistics and Intro to SwiftUI

After going over the mechanics of how the course works, this first lecture dives right into creating an iOS application (a card-matching game called Memorize).  The Xcode development environment is used to demonstrate the basics of SwiftUI's declarative approach to composing user-interfaces.

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Slides
MVVM Graphic
Lecture 2

MVVM and the Swift Type System

Conceptual overview of the architectural paradigm underlying the development of applications for iOS using SwiftUI: MVVM.  In addition, a key underpinning of the Swift Programming Language, its type system, is explained.  The Memorize demonstration continues, incorporating MVVM.

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Slides

Reading 1

Assignment 1
Reactive Coding Example
Lecture 3

Reactive UI Protocols Layout

Now that MVVM has been applied to Memorize, we can use the reactive nature of SwiftUI to make the cards flip over by processing multitouch events, updating our Model through our ViewModel and having our UI stay in sync with our Model at all times.  An important concept, protocols, is covered in more detail as well as the basics about how to lay out Views in the UI.

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Slides
Memorize App Laid Out in Grid
Lecture 4

Grid enum Optionals

The survey of the Swift type system completes with a discussion of enum.  An important language construct, Optionals, is both explained in slides and then demonstrated in Memorize as we fully implement the logic of the game.

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Slides

GridLayout.swift

Reading 2

Assignment 2
Cardified Circle
Lecture 5

ViewBuilder Shape ViewModifier

Access Control.  More about drawing, including the @ViewBuilder construct for expressing a conditional list of Views, the Shape protocol for custom drawing and ViewModifier, a mechanism for making incremental modifications to Views.

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Slides
Animated Cards
Lecture 6

Animation

@State (temporary state in a View) and property observers.  Deep dive into animation, including implicit vs. explicit animations, transitions, Shape animations, animating ViewModifiers and more.  Animate flipping of cards, new game and “pie” bonus countdown.

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Slides

Reading 3

Assignment 3
Lecture 7

Multithreading EmojiArt

A brand new demo, EmojiArt, is embarked upon, starting off with a review of MVVM and then employing API such as ScrollView, UIImage and Drag & Drop.  After the concept of multithreading is covered, it is used to prevent blocking the UI while fetching a background image from the network.

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Slides

EmojiArtExtensions.swift

Demo Code
Lecture 8

Gestures JSON

A couple of persistence topics (UserDefaults API and JSON encoding/decoding) are covered as well as the conceptual underpinnings of multi-touch gesture handling.  EmojiArt is then enhanced to persist changes and to support pinching and dragging multi-touch gestures to zoom in and out and pan on the document.

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Slides

AnimatableSystemFontModifier.swift

Demo Code

Assignment 4

Assignment 5
Lecture 9 Still
Lecture 9

Data Flow

Property wrappers (like @Published, @EnvironmentObject, @Binding) are discussed along with Publishers.  EmojiArt then uses these to autosave itself and to support choosing between multiple palettes of emoji.

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Slides

EmojiArtDocumentPalette.swift

Demo Code
Picker Demo
Lecture 11

Enroute Picker

The first of (the final) four lectures to cover topics for students to use in their final projects.  Picker.  Introduction of the Enroute demo code-base.

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Slides

Demo Code
Emoji Art Document Viewer
Lecture 13

Persistence

CloudKit and filesystem access.  Store EmojiArt documents in the filesystem.

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Slides

Demo Code
Sunset view from Stanford Campus