Hacking with iOS: SwiftUI Edition
Project 1: WeSplit
Learn the basics of SwiftUI with your first project
Overview
- WeSplit: Introduction
- Understanding the basic structure of a SwiftUI app
- Creating a form
- Adding a navigation bar
- Modifying program state
- Binding state to user interface controls
- Creating views in a loop
Implementation
- Reading text from the user with TextField
- Creating pickers in a form
- Adding a segmented control for tip percentages
- Calculating the total per person
- Hiding the keyboard
Challenges
Project 2: Guess the Flag
Build a game with stacks, images, and alerts
Overview
- Guess the Flag: Introduction
- Using stacks to arrange views
- Colors and frames
- Gradients
- Buttons and images
- Showing alert messages
Implementation
Challenges
Project 3: Views and Modifiers
Dive deep into Swift's rendering system
Overview
Concepts
- Why does SwiftUI use structs for views?
- What is behind the main SwiftUI view?
- Why modifier order matters
- Why does SwiftUI use “some View” for its view type?
Advanced Usage
- Conditional modifiers
- Environment modifiers
- Views as properties
- View composition
- Custom modifiers
- Custom containers
Challenges
Project 4: BetterRest
Use machine learning to improve sleep
Overview
- BetterRest: Introduction
- Entering numbers with Stepper
- Selecting dates and times with DatePicker
- Working with dates
- Training a model with Create ML
Implementation
Challenges
Project 5: Word Scramble
Build a letter rearranging game with List
Overview
- Word Scramble: Introduction
- Introducing List, your best friend
- Loading resources from your app bundle
- Working with strings
Implementation
Challenges
Project 6: Animation
Spruce up your UI with springs, bounces, and more
Overview
Basics
- Creating implicit animations
- Customizing animations in SwiftUI
- Animating bindings
- Creating explicit animations
Advanced Usage
- Controlling the animation stack
- Animating gestures
- Showing and hiding views with transitions
- Building custom transitions using ViewModifier
Challenges
Project 7: iExpense
Bring in a second view with this expense tracking app
Overview
- iExpense: Introduction
- Why @State only works with structs
- Sharing SwiftUI state with @StateObject
- Showing and hiding views
- Deleting items using onDelete()
- Storing user settings with UserDefaults
- Archiving Swift objects with Codable
Implementation
- Building a list we can delete from
- Working with Identifiable items in SwiftUI
- Sharing an observed object with a new view
- Making changes permanent with UserDefaults
- Final polish
Challenges
Project 8: Moonshot
Teach users about space history with scroll views, Codable, and more
Overview
- Moonshot: Introduction
- Resizing images to fit the screen using GeometryReader
- How ScrollView lets us work with scrolling data
- Pushing new views onto the stack using NavigationLink
- Working with hierarchical Codable data
- How to lay out views in a scrolling grid
Implementation
- Loading a specific kind of Codable data
- Using generics to load any kind of Codable data
- Formatting our mission view
- Showing mission details with ScrollView and GeometryReader
- Merging Codable structs
- Finishing up with one last view
Challenges
Project 9: Drawing
Use shapes, paths, colors, and more to create custom art for your app
Paths and Shapes
- Drawing: Introduction
- Creating custom paths with SwiftUI
- Paths vs shapes in SwiftUI
- Adding strokeBorder() support with InsettableShape
Customization and Performance
- Transforming shapes using CGAffineTransform and even-odd fills
- Creative borders and fills using ImagePaint
- Enabling high-performance Metal rendering with drawingGroup()
Special Effects and Animation
- Special effects in SwiftUI: blurs, blending, and more
- Animating simple shapes with animatableData
- Animating complex shapes with AnimatablePair
- Creating a spirograph with SwiftUI
Challenges
Project 10: Cupcake Corner
Build an app that sends and receives JSON from the internet
Overview
- Cupcake Corner: Introduction
- Adding Codable conformance for @Published properties
- Sending and receiving Codable data with URLSession and SwiftUI
- Loading an image from a remote server
- Validating and disabling forms
Implementation
- Taking basic order details
- Checking for a valid address
- Preparing for checkout
- Encoding an ObservableObject class
- Sending and receiving orders over the internet
Challenges
Project 11: Bookworm
Use Core Data to build an app that tracks books you like
Overview
- Bookworm: Introduction
- Creating a custom component with @Binding
- Accepting multi-line text input with TextEditor
- How to combine Core Data and SwiftUI
Implementation
- Creating books with Core Data
- Adding a custom star rating component
- Building a list with @FetchRequest
- Showing book details
- Sorting fetch requests with SortDescriptor
- Deleting from a Core Data fetch request
- Using an alert to pop a NavigationLink programmatically
Challenges
Project 12: Core Data
Take an in-depth tour of how SwiftUI and Core Data work together
Basics
- Core Data: Introduction
- Why does \.self work for ForEach?
- Creating NSManagedObject subclasses
- Conditional saving of NSManagedObjectContext
- Ensuring Core Data objects are unique using constraints
Advanced Techniques
- Filtering @FetchRequest using NSPredicate
- Dynamically filtering @FetchRequest with SwiftUI
- One-to-many relationships with Core Data, SwiftUI, and @FetchRequest
Challenges
Project 13: Instafilter
Learn to link SwiftUI, UIKit, and Core Image in one app
Overview
- Instafilter: Introduction
- How property wrappers become structs
- Responding to state changes using onChange()
- Showing multiple options with confirmationDialog()
- Integrating Core Image with SwiftUI
- Wrapping a UIViewController in a SwiftUI view
- Using coordinators to manage SwiftUI view controllers
- How to save images to the user’s photo library
Implementation
- Building our basic UI
- Importing an image into SwiftUI using PHPickerViewController
- Basic image filtering using Core Image
- Customizing our filter using confirmationDialog()
- Saving the filtered image using UIImageWriteToSavedPhotosAlbum()
Challenges
Project 14: Bucket List
Embed maps and make network calls in this life goals app
Overview
- Bucket List: Introduction
- Adding conformance to Comparable for custom types
- Writing data to the documents directory
- Switching view states with enums
- Integrating MapKit with SwiftUI
- Using Touch ID and Face ID with SwiftUI
Implementation
- Adding user locations to a map
- Improving our map annotations
- Selecting and editing map annotations
- Downloading data from Wikipedia
- Sorting Wikipedia results
- Introducing MVVM into your SwiftUI project
- Locking our UI behind Face ID
Challenges
Project 15: Accessibility
Learn how to make your apps available to everyone
Overview
- Accessibility: Introduction
- Identifying views with useful labels
- Hiding and grouping accessibility data
- Reading the value of controls
Fixing Projects
Challenges
Project 16: Hot Prospects
Build an app for conferences with tabs, context menus, and more.
Overview
- Hot Prospects: Introduction
- Reading custom values from the environment with @EnvironmentObject
- Creating tabs with TabView and tabItem()
- Manually publishing ObservableObject changes
- Understanding Swift’s Result type
- Controlling image interpolation in SwiftUI
- Creating context menus
- Adding custom row swipe actions to a List
- Scheduling local notifications
- Adding Swift package dependencies in Xcode
Implementation
- Building our tab bar
- Sharing data across tabs using @EnvironmentObject
- Dynamically filtering a SwiftUI List
- Generating and scaling up a QR code
- Scanning QR codes with SwiftUI
- Adding options with swipe actions
- Saving and loading data with UserDefaults
- Adding a context menu to an image
- Posting notifications to the lock screen
Challenges
Project 17: Flashzilla
Use gestures and haptics to build a learning app.
Overview
- Flashzilla: Introduction
- How to use gestures in SwiftUI
- Making vibrations with UINotificationFeedbackGenerator and Core Haptics
- Disabling user interactivity with allowsHitTesting()
- Triggering events repeatedly using a timer
- How to be notified when your SwiftUI app moves to the background
- Supporting specific accessibility needs with SwiftUI
Implementation
- Designing a single card view
- Building a stack of cards
- Moving views with DragGesture and offset()
- Coloring views as we swipe
- Counting down with a Timer
- Ending the app with allowsHitTesting()
- Making iPhones vibrate with UINotificationFeedbackGenerator
- Fixing the bugs
- Adding and deleting cards
Challenges
Project 18: Layout and Geometry
Explore the inner workings of SwiftUI's layout system.
Positioning
- Layout and geometry: Introduction
- How layout works in SwiftUI
- Alignment and alignment guides
- How to create a custom alignment guide
- Absolute positioning for SwiftUI views
GeometryReader
Challenges
Project 19: SnowSeeker
Build an app for ski resorts that works great on iPad.
Overview
- SnowSeeker: Introduction
- Working with two side by side views in SwiftUI
- Using alert() and sheet() with optionals
- Using groups as transparent layout containers
- Making a SwiftUI view searchable
Implementation
- Building a primary list of items
- Making NavigationView work in landscape
- Creating a secondary view for NavigationView
- Searching for data in a List
- Changing a view’s layout in response to size classes
- Binding an alert to an optional string
- Letting the user mark favorites
