Hackingwithswift.com

Catalog

• #Availability checking in Swift: backwards compatibility the smart way

• #I screwed up one key accessibility behavior, and now I'm on a mission to do better

• #Learn essential Swift in one hour

• #Swift Concurrency by Example

  • #Concurrency vs parallelism
  • #Dedication
  • #How to call an async function using async let
  • #How to call async throwing functions
  • #How to cancel a Task
  • #How to cancel a task group
  • #How to control the priority of a task
  • #How to convert an AsyncSequence into a Sequence
  • #How to create a custom AsyncSequence
  • #How to create a task group and add tasks to it
  • #How to create and call an async function
  • #How to create and run a task
  • #How to create and use an actor in Swift
  • #How to create and use async properties
  • #How to create and use task local values
  • #How to create continuations that can throw errors
  • #How to download JSON from the internet and decode it into any Codable type
  • #How to fix the error “async call in a function that does not support concurrency”
  • #How to follow this guide
  • #How to get a Result from a task
  • #How to handle different result types in a task group
  • #How to loop over an AsyncSequence using for await
  • #How to make a task sleep
  • #How to make async command-line tools and scripts
  • #How to make function parameters isolated
  • #How to make parts of an actor nonisolated
  • #How to manipulate an AsyncSequence using map(), filter(), and more
  • #How to run tasks using SwiftUI’s task() modifier
  • #How to store continuations to be resumed later
  • #How to use @MainActor to run code on the main queue
  • #How to use continuations to convert completion handlers into async functions
  • #How to voluntarily suspend a task
  • #Important: Do not use an actor for your SwiftUI data models
  • #Is it efficient to create many tasks?
  • #Main thread and main queue: what’s the difference?
  • #This stuff is hard
  • #Understanding how global actor inference works
  • #Understanding how priority escalation works
  • #Understanding threads and queues
  • #What are tasks and task groups?
  • #What calls the first async function?
  • #What is a synchronous function?
  • #What is actor hopping and how can it cause problems?
  • #What is an actor and why does Swift have them?
  • #What is an asynchronous function?
  • #What’s the difference between a task and a detached task?
  • #What’s the difference between actors, classes, and structs?
  • #What’s the difference between async let, tasks, and task groups?
  • #What’s the difference between await and async let?
  • #What’s the difference between Sequence, AsyncSequence, and AsyncStream?
  • #What’s the performance cost of calling an async function?
  • #Where is Swift concurrency supported?
  • #Why can’t we call async functions using async var?

• #SwiftData by Example

  • #Creating, editing, and deleting model objects
  • #Dedication
  • #Defining a data model with SwiftData
  • #Filtering the results from a SwiftData query
  • #Frequently asked questions about SwiftData
  • #How SwiftData works with Swift concurrency
  • #How SwiftUI tracks changes in SwiftData objects
  • #How to access a SwiftData container from widgets
  • #How to add minimum and maximum constraints to relationships
  • #How to add multiple configurations to a ModelContainer
  • #How to add support for undo and redo
  • #How to animate changes to SwiftData queries
  • #How to batch insert large amounts of data efficiently
  • #How to change SwiftData’s underlying storage filename
  • #How to check whether a SwiftData model object has been deleted
  • #How to check whether a SwiftData model object has been deleted
  • #How to completely reset a SwiftData ModelContainer
  • #How to configure a custom ModelContainer using ModelConfiguration
  • #How to connect SwiftData to SwiftUI
  • #How to count results without loading them
  • #How to create a background context
  • #How to create a complex migration using VersionedSchema
  • #How to create a custom FetchDescriptor
  • #How to create a document-based app with SwiftData
  • #How to create cascade deletes using relationships
  • #How to create derived attributes with SwiftData
  • #How to create many-to-many relationships
  • #How to create one-to-many relationships
  • #How to create one-to-one relationships
  • #How to define SwiftData models using the @Model macro
  • #How to delete a SwiftData object
  • #How to delete all instances of a particular model
  • #How to discard changes to a SwiftData object
  • #How to dynamically change a query's sort order or predicate
  • #How to enable or disable autosave for a ModelContext
  • #How to encrypt SwiftData
  • #How to enumerate a fetch request to handle lots of data efficiently
  • #How to filter SwiftData results with predicates
  • #How to find a SwiftData object by its identifier
  • #How to follow this quick start guide
  • #How to get natural string sorting for SwiftData queries
  • #How to index SwiftData objects in Spotlight
  • #How to index SwiftData properties for faster searching
  • #How to make Core Data and SwiftData coexist in the same app
  • #How to make SwiftData models conform to Codable
  • #How to make transient attributes in a SwiftData model
  • #How to make unique attributes in a SwiftData mode
  • #How to merge two model contexts
  • #How to migrate an app from Core Data to SwiftData
  • #How to optimize the performance of your SwiftData apps
  • #How to pre-load an app with JSON
  • #How to pre-populate an app with an existing SwiftData database
  • #How to read the contents of a SwiftData database store
  • #How to read the contents of a SwiftData database store
  • #How to rollback changes without saving
  • #How to save a SwiftData object
  • #How to sort SwiftData queries using key paths or SortDescriptor
  • #How to stop SwiftData syncing with CloudKit
  • #How to store SwiftData attributes in an external file
  • #How to sync SwiftData with iCloud
  • #How to transfer an object between a background context and the main context
  • #How to use @Query to read SwiftData objects from SwiftUI
  • #How to use MVVM to separate SwiftData from your views
  • #How to use SwiftData in SwiftUI previews
  • #How to use SwiftData to store singletons
  • #How to use SwiftData with UIKit
  • #How to write UI tests for your SwiftData code
  • #How to write unit tests for your SwiftData code
  • #Inferred vs explicit relationships
  • #Lightweight vs complex migrations
  • #Lightweight vs complex migrations
  • #Migrating from Core Data to SwiftData
  • #Querying SwiftData objects in SwiftUI
  • #Should you learn SwiftData, Core Data, or both?
  • #Sorting query results
  • #SwiftData tutorial: Building a complete project
  • #SwiftData vs Core Data
  • #Using launch arguments to debug SwiftData and Core Data
  • #Using structs and enums in SwiftData models
  • #What is SwiftData?
  • #What kind of data can be a SwiftData property?
  • #What's the difference between @Bindable and @Binding?
  • #What's the difference between ModelContainer, ModelContext, and ModelConfiguration?
  • #When does SwiftData autosave data?
  • #Why are SwiftData models created as classes?
  • #Working with relationships
  • #Wrap up: our SwiftData project is complete

• #SwiftUI by Example

  • #Adding items to an order with @EnvironmentObject
  • #Adding swipe to delete and EditButton
  • #Adding TabView and tabItem()
  • #All SwiftUI property wrappers explained and compared
  • #Answering the big question: should you learn SwiftUI, UIKit, or both?
  • #Basic form design
  • #Bindings and forms
  • #Breaking forms into sections
  • #Building a complete project
  • #Building a menu using List
  • #Common SwiftUI errors and how to fix them
  • #Composing views to create a list row
  • #Customizing Button with ButtonStyle
  • #Customizing ProgressView with ProgressViewStyle
  • #Customizing Toggle with ToggleStyle
  • #Dedication
  • #Displaying a detail screen with NavigationLink
  • #Enabling and disabling elements in forms
  • #Formatting interpolated strings in SwiftUI
  • #Frequently asked questions about SwiftUI
  • #How to access a Core Data managed object context from a SwiftUI view
  • #How to add a badge to TabView items and List rows
  • #How to add a border to a TextField
  • #How to add a gesture recognizer to a view
  • #How to add a placeholder to a TextField
  • #How to add a search bar to filter your data
  • #How to add a TextField to an alert
  • #How to add a toolbar to the keyboard
  • #How to add actions to alert buttons
  • #How to add advanced text styling using AttributedString
  • #How to add an AppDelegate to a SwiftUI app
  • #How to add an inspector to any view
  • #How to add and remove views with a transition
  • #How to add bar items to a navigation view
  • #How to add Core Data objects from SwiftUI views
  • #How to add custom activation commands for Voice Control
  • #How to add custom swipe action buttons to a List row
  • #How to add extra padding to the safe area
  • #How to add haptic effects using sensory feedback
  • #How to add horizontal and vertical scrolling using ScrollView
  • #How to add in-app purchases in SwiftUI
  • #How to add keyboard shortcuts using keyboardShortcut()
  • #How to add Metal shaders to SwiftUI views using layer effects
  • #How to add search tokens to a search field
  • #How to add sections to a list
  • #How to add spacing between letters in text
  • #How to add visual effect blurs
  • #How to adjust List row separator insets
  • #How to adjust List row separator visibility and color
  • #How to adjust text alignment using multilineTextAlignment()
  • #How to adjust the accent color of a view
  • #How to adjust the opacity of a view
  • #How to adjust the position of a view using its offset
  • #How to adjust the size of a view relative to its container
  • #How to adjust the way an image is fitted to its space
  • #How to adjust views by tinting, desaturating, and more
  • #How to align form text and controls neatly with LabeledContent
  • #How to allow row selection in a list
  • #How to animate changes in binding values
  • #How to animate SF Symbols
  • #How to animate the size of text
  • #How to apply multiple animations to a view
  • #How to ask the user to review your app
  • #How to automatically switch between HStack and VStack based on size class
  • #How to become a SwiftUI expert
  • #How to blend views together
  • #How to blur a view
  • #How to change the background color of List, TextEditor, and more
  • #How to change the order of view layering using Z index
  • #How to change the tint color for individual list rows
  • #How to clip a view so only part is visible
  • #How to color the padding around a view
  • #How to combine shapes to create new shapes
  • #How to combine text views together
  • #How to combine transitions
  • #How to configure Core Data to work with SwiftUI
  • #How to continue an NSUserActivity in SwiftUI
  • #How to control layout priority using layoutPriority()
  • #How to control spacing around individual views using padding
  • #How to control the tappable area of a view using contentShape()
  • #How to control which NavigationSplitView column is shown in compact layouts
  • #How to control which view is shown when your app launches
  • #How to convert a SwiftUI view to an image
  • #How to create 3D effects like Cover Flow using ScrollView and GeometryReader
  • #How to create a Core Data fetch request using @FetchRequest
  • #How to create a custom layout using the Layout protocol
  • #How to create a custom transition
  • #How to create a date picker and read values from it
  • #How to create a document-based app using FileDocument and DocumentGroup
  • #How to create a list of dynamic items
  • #How to create a list of static items
  • #How to create a List or a ForEach from a binding
  • #How to create a marching ants border effect
  • #How to create a picker and read values from it
  • #How to create a segmented control and read values from it
  • #How to create a slider and read values from it
  • #How to create a spring animation
  • #How to create a stepper and read values from it
  • #How to create a tappable button
  • #How to create a toggle switch
  • #How to create a toolbar and add buttons to it
  • #How to create a two-column or three-column layout with NavigationSplitView
  • #How to create an adaptive layout with ViewThatFits
  • #How to create an explicit animation
  • #How to create and compose custom views
  • #How to create asymmetric transitions
  • #How to create basic animations
  • #How to create constant bindings
  • #How to create custom animated drawings with TimelineView and Canvas
  • #How to create custom bindings
  • #How to create custom modifiers
  • #How to create different layouts using size classes
  • #How to create expanding lists
  • #How to create gesture chains using sequenced(before)
  • #How to create grouped and inset grouped lists
  • #How to create modifiers for a UIViewRepresentable struct
  • #How to create multi-column lists using Table
  • #How to create multi-line editable text with TextEditor
  • #How to create multi-step animations using phase animators
  • #How to create scrolling pages of content using tabViewStyle()
  • #How to create secure text fields using SecureField
  • #How to create stacks using VStack and HStack
  • #How to create static labels with a Text view
  • #How to create views in a loop using ForEach
  • #How to customize a view's width in NavigationSplitView
  • #How to customize stack layouts with alignment and spacing
  • #How to customize the background color of navigation bars, tab bars, and toolbars
  • #How to customize the display mode of NavigationSplitView
  • #How to customize the submit button for TextField, SecureField, and TextEditor
  • #How to customize the way links are opened
  • #How to delay an animation
  • #How to delete Core Data objects from SwiftUI views
  • #How to detect and respond to key press events
  • #How to detect dark mode
  • #How to detect device rotation
  • #How to detect shake gestures
  • #How to detect the location of a tap inside a view
  • #How to detect the Reduce Motion accessibility setting
  • #How to detect the user hovering over a view
  • #How to detect when your app moves to the background or foreground with scenePhase
  • #How to disable autocorrect in a TextField
  • #How to disable ScrollView clipping so contents overflow
  • #How to disable taps for a view using allowsHitTesting()
  • #How to disable the overlay color for images inside Button and NavigationLink
  • #How to dismiss the keyboard for a TextField
  • #How to dismiss the keyboard when the user scrolls
  • #How to display a bottom sheet
  • #How to display solid shapes
  • #How to draw a border around a view
  • #How to draw a border inside a view
  • #How to draw a checkerboard
  • #How to draw a custom path
  • #How to draw a shadow around a view
  • #How to draw images using Image views
  • #How to draw part of a solid shape using trim()
  • #How to draw polygons and stars
  • #How to dynamically adjust the appearance of a view based on its size and location
  • #How to dynamically adjust the color of an SF Symbol
  • #How to dynamically change between VStack and HStack
  • #How to embed a view in a navigation view
  • #How to embed views in a tab bar using TabView
  • #How to enable editing on a list using EditButton
  • #How to enable pull to refresh
  • #How to enable vertical page scrolling
  • #How to export files using fileExporter()
  • #How to fill and stroke shapes at the same time
  • #How to filter Core Data fetch requests using a predicate
  • #How to find which data change is causing a SwiftUI view to update
  • #How to fix “Ambiguous reference to member 'buildBlock()'”
  • #How to fix “Cannot assign to property: 'self' is immutable”
  • #How to fix “Cannot convert value of type '() -> ()' to expected argument type '() -> _'”
  • #How to fix “Cannot convert value of type 'String' to expected argument type 'Binding<String>'”
  • #How to fix “Cannot convert value of type 'String' to expected argument type 'Text'”
  • #How to fix “Fatal error: No ObservableObject of type SomeType found”
  • #How to fix “Function declares an opaque return type, but has no return statements in its body from which to infer an underlying type”
  • #How to fix “Initializer 'init(_:rowContent:)' requires that 'SomeType' conform to 'Identifiable'”
  • #How to fix “Missing argument for parameter 'content' in call”
  • #How to fix “Modifying state during view update, this will cause undefined behavior”
  • #How to fix “Property declares an opaque return type, but has no initializer expression from which to infer an underlying type”
  • #How to fix “Protocol 'View' can only be used as a generic constraint because it has Self or associated type requirements”
  • #How to fix “Referencing initializer 'init(wrappedValue:)' on 'ObservedObject' requires that 'SomeType' conform to 'ObservableObject'”
  • #How to fix a Form Picker or a NavigationLink that isn't tappable
  • #How to fix images not resizing
  • #How to flash the scroll bar indicators of a ScrollView or List
  • #How to follow this quick start guide
  • #How to force one gesture to recognize before another using highPriorityGesture()
  • #How to force views to one side inside a stack using Spacer
  • #How to format a TextField for numbers
  • #How to format dates inside text views
  • #How to format text inside text views
  • #How to get bordered buttons that stand out
  • #How to get custom colors and transparency with SF Symbols
  • #How to get translucent lists on macOS
  • #How to give a view a custom frame
  • #How to group views together
  • #How to group views together with ControlGroup
  • #How to group views visually using GroupBox
  • #How to handle pinch to zoom for views
  • #How to hide and reveal content using DisclosureGroup
  • #How to hide and show the sidebar programmatically
  • #How to hide and show the status bar
  • #How to hide the home indicator and other system UI
  • #How to hide the label of a Picker, Stepper, Toggle, and more using labelsHidden()
  • #How to hide the scroll indicators in ScrollView, List, and more
  • #How to hide the tab bar, navigation bar, or other toolbars
  • #How to indent the content or scroll indicators in a ScrollView
  • #How to insert images into text
  • #How to inset the safe area with custom content
  • #How to integrate SpriteKit using SpriteView
  • #How to layer views on top of each other using ZStack
  • #How to lazy load views using LazyVStack and LazyHStack
  • #How to let the user paste data into your app
  • #How to let the user select multiple dates
  • #How to let users customize toolbar buttons
  • #How to let users delete rows from a list
  • #How to let users edit your navigation title
  • #How to let users find and replace text
  • #How to let users import videos using PhotosPicker
  • #How to let users move rows in a list
  • #How to let users pick options from a menu
  • #How to let users select a color with ColorPicker
  • #How to let users select pictures using PhotosPicker
  • #How to let users select text
  • #How to let users share content using the system share sheet
  • #How to limit the number of items in a fetch request
  • #How to load a remote image from a URL
  • #How to load custom colors from an asset catalog
  • #How to make a fixed size Spacer
  • #How to make a scroll view move to a location using ScrollViewReader
  • #How to make a ScrollView snap with paging or between child views
  • #How to make a ScrollView start at the bottom
  • #How to make a TextField expand vertically as the user types
  • #How to make a TextField or TextEditor have default focus
  • #How to make a view dismiss itself
  • #How to make buttons that repeat their action when pressed
  • #How to make carousel lists on watchOS
  • #How to make SwiftUI modifiers safer to use with @warn_unqualified_access
  • #How to make TextField uppercase or lowercase using textCase()
  • #How to make two gestures recognize at the same time using simultaneousGesture()
  • #How to make two views the same width or height
  • #How to make views scroll with a custom transition
  • #How to make VoiceOver read characters individually
  • #How to mark content as a placeholder using redacted()
  • #How to mark content as private using privacySensitive()
  • #How to mask one view with another
  • #How to open a new window
  • #How to open web links in Safari
  • #How to override animations with transactions
  • #How to place content outside the safe area
  • #How to play movies with VideoPlayer
  • #How to position views in a fixed grid
  • #How to position views in a grid using LazyVGrid and LazyHGrid
  • #How to present a full screen modal view using fullScreenCover()
  • #How to present a new view using sheets
  • #How to present multiple sheets
  • #How to prevent a sheet from being dismissed with a swipe
  • #How to preview your layout at different Dynamic Type sizes
  • #How to preview your layout in a navigation view
  • #How to preview your layout in different devices
  • #How to preview your layout in light and dark mode
  • #How to preview your layout in portrait or landscape
  • #How to provide relative sizes using GeometryReader
  • #How to provide visual structure using foreground styles
  • #How to push a new view onto a NavigationStack
  • #How to push a new view when a list row is tapped
  • #How to read tap and double-tap gestures
  • #How to read text from a TextField
  • #How to read the Digital Crown on watchOS using digitalCrownRotation()
  • #How to read the red, green, and blue values from a Color
  • #How to read the user's location using LocationButton
  • #How to recommend another app using appStoreOverlay()
  • #How to reduce animations when requested
  • #How to render a gradient
  • #How to render a SwiftUI view to a PDF
  • #How to render images using SF Symbols
  • #How to render Markdown content in text
  • #How to respond to view lifecycle events - onAppear() and onDisappear()
  • #How to return different view types
  • #How to rotate a view
  • #How to rotate a view in 3D
  • #How to round the corners of a view
  • #How to run a completion callback when an animation finishes
  • #How to run an asynchronous task when a view is shown
  • #How to run code when your app launches
  • #How to run some code when state changes using onChange()
  • #How to save and load NavigationStack paths using Codable
  • #How to scale a view up or down
  • #How to scroll to a specific row in a list
  • #How to send state updates manually using objectWillChange
  • #How to set the background color of list rows using listRowBackground()
  • #How to show a context menu
  • #How to show a Map view
  • #How to show a menu when a button is pressed
  • #How to show a popover view
  • #How to show an action sheet
  • #How to show an alert
  • #How to show annotations in a Map view
  • #How to show different images and other views in light or dark mode
  • #How to show indeterminate progress using ProgressView
  • #How to show multiple alerts in a single view
  • #How to show progress on a task using ProgressView
  • #How to show text and an icon side by side using Label
  • #How to specify the Dynamic Type sizes a view supports
  • #How to stack modifiers to create more advanced effects
  • #How to start an animation immediately after a view appears
  • #How to stop system gestures from interfering with your own
  • #How to store views as properties
  • #How to style text views with fonts, colors, line spacing, and more
  • #How to support drag and drop in SwiftUI
  • #How to synchronize animations from one view to another with matchedGeometryEffect()
  • #How to take action when the user submits a TextField
  • #How to tell the user that no content is available
  • #How to tile an image
  • #How to use @EnvironmentObject to share data between views
  • #How to use @ObservedObject to manage state from external objects
  • #How to use @StateObject to create and monitor external objects
  • #How to use a timer with SwiftUI
  • #How to use decorative images to reduce screen reader clutter
  • #How to use Dynamic Type with a custom font
  • #How to use images and other views as a backgrounds
  • #How to use implicit stacking
  • #How to use Instruments to profile your SwiftUI code and identify slow layouts
  • #How to use programmatic navigation in SwiftUI
  • #How to use UIBezierPath and CGPath in SwiftUI
  • #How to wrap a custom UIView for SwiftUI
  • #Introduction to accessibility with SwiftUI
  • #Introduction to navigation
  • #Introduction to using Core Data with SwiftUI
  • #Learn once, apply anywhere
  • #Migrating from UIKit to SwiftUI
  • #Observable objects, environment objects, and @Published
  • #Pickers in forms
  • #Polishing designs with fonts and colors
  • #Presenting an alert
  • #Showing and hiding form rows
  • #SwiftUI tips and tricks
  • #SwiftUI vs Interface Builder and storyboards
  • #SwiftUI's built-in shapes
  • #Two-way bindings in SwiftUI
  • #Understanding property wrappers in Swift and SwiftUI
  • #What is SwiftUI?
  • #What is the @AppStorage property wrapper?
  • #What is the @Binding property wrapper?
  • #What is the @Environment property wrapper?
  • #What is the @EnvironmentObject property wrapper?
  • #What is the @FetchRequest property wrapper?
  • #What is the @FocusState property wrapper?
  • #What is the @GestureState property wrapper?
  • #What is the @ObservedObject property wrapper?
  • #What is the @Published property wrapper?
  • #What is the @ScaledMetric property wrapper?
  • #What is the @SceneStorage property wrapper?
  • #What is the @State property wrapper?
  • #What is the @StateObject property wrapper?
  • #What is the @UIApplicationDelegateAdaptor property wrapper?
  • #What's in the basic template?
  • #What's the difference between @ObservedObject, @State, and @EnvironmentObject?
  • #When should you use ContainerRelativeShape?
  • #Working with containers
  • #Working with forms
  • #Working with lists
  • #Working with presentations
  • #Working with state
  • #Wrap up: our SwiftUI project is complete

• #What's new in Swift 6.0?

• #What's new in Swift?

  • #1.1
    countElements() is now count()macOS apps can now use @NSApplicationMain
  • #1.2
    A new Set data structureClasses can now have static methods and propertiesClosures can now be marked @noescapeConstants no longer require immediate initializationImplicit bridging has been reducedMultiple if let bindingsThe flatMap() method transforms optionals and arraysThe zip() function joins two sequencesTypecasting now includes as!
  • #2.0
    Checking API availabilityMeasure strings using their character countMutability warningsThrowing errorsUse the defer keyword to delay work until your scope exitsUse the guard keyword for early returns
  • #2.1
    String interpolation can now include string literals
  • #2.2
    ++ and -- are deprecatedComparing tuplesCompile-time Swift version checkingMore keywords can be used as argument labelsRenamed debug identifiers: line, function, fileStringified selectors are deprecatedTraditional C-style for loops are deprecatedTuple splat syntax is deprecatedTupleVariable parameters have been deprecated
  • #3.0
    All function parameters have labels unless you request otherwiseOmit needless wordsSwifty importing of C functionsUpperCamelCase has been replaced with lowerCamelCase for enums and propertiesVerbs and nouns
  • #3.1
    Concrete constrained extensionsGenerics with nested typesSequences get prefix(while:) and drop(while:) methods
  • #4.0
    Encoding and decoding data using CodableImproved dictionary functionalityImproved keypaths for key-value codingMulti-line string literalsOne-sided rangesStrings are collections again
  • #4.1
    Build configuration import testingConditional conformancesflatMap is now (partly) compactMap()Key decoding strategies for CodableRecursive constraints on associated typesSynthesized Equatable and HashableTarget environment testing
  • #4.2
    Boolean togglingChecking sequence elements match a conditionDerived collections of enum casesDynamic member look upDynamic member look upIn-place collection element removalRandom number generation and shufflingSimpler, more secure hashingWarning and error diagnostic directives
  • #5.9
    Noncopyable structs and enums