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  • ⭐features
    • ⭐Swift
      • ⭐️ Swift 5.6
        • any
        • type placeholders
      • ⭐️ Swift 5.7
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      • ⭐SwiftUI 4.0
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      • Xcode 14
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      • ⭐️ iOS 15
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      • ⭐️ iOS 16
    • Global Variables
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  • 👔custom
    • 🌀extension
      • 🌀View+
        • 👔view.if(_:then:)
        • 👔view.if(let:then:)
        • 👔view.inverseMask()
        • 👔view.overlayText()
        • 👔view.resizableFont()
        • 👔view.watermark()
        • 🚫view.foreground()
      • 🌀Color+
        • 🌀system colors
          • 🖼️SystemColorsView
          • 🖼️Swatch_0
        • 🌀Color.rgb()
        • 🌀color.hue
      • 🌀Gradient+
        • 🌀Gradient.linear()
        • 🌀Gradient + View
      • 🌀Image+
        • 🌀Image(playground:)
      • 🌀Formatter+
      • 🌀RoundedRectangle+
      • 🌀Text+
        • 🌀Text(symbol:)
    • 🔰snippets
      • 💾view + previews
      • 💾view modifier (template)
    • 🎁package
      • 📕如何自製 Swift package
      • 🏛️GeometryKit
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        • 🅿️Vector2D
        • 🅿️Frame
    • 🅿️protocol
      • 🅿️Repeatable
    • 🖼️view
      • 👔HLine / VLine
      • 👔Swatch
      • 👔ShapeStyleView
    • 🎛️control
      • 🎛️SlidersForSize
      • 🎛️SliderWithLabel
  • 🐦Swift
    • 🎲math functions
      • abs()
      • .rounded()
      • .squareRoot()
      • pow()
    • 🔰scope
      • 🔸global scope
      • 🔸local scope
      • 🔸module
      • 🔹import
      • 🔸framework
        • 🧩built-in frameworks
          • 🧩Foundation
            • 📦Calendar
            • 📅Date
              • .sevenDaysOut
              • Date.from(year:month:day:)
              • Date.roundedHoursFromNow(hours)
            • 📦URL
              • 🌀 URL+ext
              • .isImage
            • 🗃️FileManager
              • 🌀 FileManager+ext
              • .documentDirectory
            • 🎁Bundle
            • 🅿️FormatStyle
          • 🧩Core Graphics
            • 🌀CGRect
              • rect.inset(by:)
            • 🌀CGSize
            • 🌀CGVector
            • 🌀CGPoint
          • 🧩SpriteKit
          • 🧩Combine
            • 🅿️Publisher
              • 🐶Future
              • 📦URLSession.DataTaskPublisher
            • ⚙️ Promise
            • 🔸Result
            • ⏰Timer
              • ✨cancellable timer
              • 👔TimerView
              • 👔TimerView (scheduledTimer)
          • 🧩AVFoundation
          • 🧩Swift Charts
          • 🧩Metal
          • 🧩WeatherKit
    • ➕operator
      • 🔸compound assignment operator
      • ✖️Character * Int
      • ✖️a^^n
      • ➕ternary conditional operator (a ? b : c)
    • 🍀type
      • 🍀type category
        • 🍀basic types
          • ✅Bool
            • .iOS14
          • ⁉️Optional
            • optional binding
            • optional chaining
            • nil coalescing
            • compare with Optional
          • 🔤String
            • 🔰String Interpolation
              • Custom String Interpolation
              • Expressible by String Interpolation
              • specifier / formatter
            • 📦AttributedString
            • 😃Emojis
            • String.Index
            • str.capitalized
            • str.split()
            • str.trim()
            • str[i], str[i..<j], str[i...j]
            • str.pad()
          • 📦Int
          • 📦Array
            • 🌀arr.split(size:)
            • 🌀arr.first()
            • arr.split(where:)
            • arr.index(of:)
            • arr.allElementsEqual
            • .allElementsSameLength
          • 📦enum
            • ⭐Comparable Enums
            • compound cases
            • 💡filter cases
            • 💡用 enum 封裝不同型別
          • 🚥tuple
          • 🔰function
            • 🔸default parameter
            • 🔸argument label
            • 🔸return value
              • #️discardable result
            • 🔰function as variable
            • 🔰fully qualified name
          • 🔰closure
            • 🔰closure expression
            • 🔰escaping closure
          • 🍄class
            • 🔰weak self
          • 🔢Numbers
            • 🅿️FloatingPoint
              • 🌀floating +−⨉÷ int
              • .decimalPlaces()
            • 🅿️BinaryFloatingPoint
              • .binaryBitPattern
              • 🖼️BinaryBitPatternView
            • 🅿️BinaryInteger
              • .binary(digits:)
            • range.contains()
          • ⚖️struct vs. class
        • 🅿️protocol
          • 🔰protocol inheritance
            • 🔰protocol hierarchy
            • 🚫can't change builtin hierarchy
          • 🔰protocol requirements
          • 🔴Protocol Extensions
          • 🔰generic protocol
            • 📘some, any
          • 🔰associated type
          • 🔴Conditional Conformance
          • 🔴Combining Protocols
          • 🔰Typecasting with Protocols
          • ⚠️retroactive conformance
          • 🅿️Any
          • 🅿️Comparable
            • .clamped(in:)
          • 🅿️Hashable
          • 🅿️Identifiable
          • 🅿️CaseIterable+ext
          • 🎬POP 介紹
          • ExpressibleByLiteral
        • ⚖️some╱any╱generics
          • 🔸some (opaque type)
          • 🔸any (boxed protocol type)
        • 🍀nested types
          • extension of nested types
          • ❓to nest or not to nest❓
        • 🍀generics
          • ⚠️generics & subtypes
          • ❗specialize generic function
          • ❓default type parameter
        • 🍀non-nominal types
      • 🔰property
        • 🔸public property
        • 🔸stored property
          • 🔸property observer (willSet/didSet)
        • 🔰computed property (get/set)
          • local computed variables
          • mutating getter / nonmutating setter
        • ⚖️stored vs. computed
        • ⚖️willSet/didSet vs. get/set
        • 🔰property wrapper
          • ✨Clamped
          • ✨Trimmed
          • ✨UnitInterval
      • 🐣inheritance
        • 🔸Self
      • 🔰type alias
      • 🔰extension
        • extension of typealias❓
      • ⭐implicit return
      • 🔰type erasure
      • 🔰initialization
        • 🔰initializers
          • 🔸required initializer
        • 🔰class initializer inheritance
          • 兩階段初始化
          • 自動繼承初始化程序
    • 🔰statement
      • 📘do
      • 🔤semicolon (;)
      • 🔰simple statement
        • 🔰expression
          • 🔰primary expressions
        • 🔰declaration
      • 🔰compiler control statement
    • 🔰flow control
      • 🔄loop
        • 📘for...in
        • 🔰for...in vs. forEach
      • 🔀branch
        • 📘if
        • 📘guard
        • 🔹switch
      • ↩️control transfer
        • 📘break
        • 📘continue
        • 📘return
        • 📘throw
        • 📘fallthrough
    • 🔰Collections
      • 🅿️Sequence
        • seq.forEach()
        • seq.reduce(_:_:)
        • seq.reduce(into:_:)
        • reduce() vs. reduce(into:)
        • seq.grouped(by:)
        • seq.sorted()
        • seq.sorted(by:)
        • seq.sorted(_:)
        • seq.foldMap(_:_:)
        • seq.stateMap(_:_:)
        • seq.sum
      • 🅿️Collection
        • collection[safe: index]
        • collection.allElementsEqual
        • collection.allElementsSameLength
        • collection.lengthsOfElements
        • collection.columnWidths
      • 🅿️IteratorProtocol
      • 🅿️OptionSet
      • Collection Types
    • 🔰Subscripts
      • Subscripts with Default Arguments
    • 🔰Attributes
      • ⭐Result Builders
        • result-building methods
        • various result types
        • result builder transform
        • custom result-builder attributes
    • 🔰Pattern Matching
      • 🔴Sentence Patterns
        • ... as! ...
        • (... as? ...)?.method()
        • if let ... as?
        • if/guard case let
        • for case let ... where
        • switch case
        • switch case is ...
        • switch case let ... where
        • switch case let ... as
        • switch on other types
      • operator (~=)
      • enum case pattern
    • 🔰Exceptions
    • 🏛️Standard Library
      • 🅿️Codable
    • 🔰Concurrency
      • 🅿️Sendable
        • 🐞has non-Sendable type
    • 🔰File System
    • 🔰Networking
    • 🐞Debugging
      • 🔮Mirror
        • Mirror.handleChildren()
      • 👔Logger
      • 👔HasMirrors
      • 👔log()
      • 👔CaseReflectable
      • 👔NonNominalTypeWrapper
      • Metatype
    • 🔰Input/Output
    • 🔰Regex
    • 🔰Access Control
  • 🔰SwiftUI
    • 🔰SwiftUI terms
      • 🔸built-in view
    • 🔰introduction
      • SwiftUI Essentials
    • 🚩app
      • 🅿️App
      • 🔰scenes
        • 🅿️Scene
      • 🔰windows
        • 📦WindowGroup
    • 🔰views
      • 🔰view hierarchy
        • 🔸container view
        • 🔸composed view
        • 🔸root view
        • 🔸child view
        • 🔸parent view
        • 🔸destination view
      • 🔰view state
        • 🔸state value
          • @State
            • 🔰init State
            • ✨dynamic underline
        • 🔸state object
          • @StateObject
        • 🔸observable object
          • 🅿️ObservableObject
          • 🔸published value
          • 🔸observer
          • @Published
        • 🔰animate state changes
        • 🔸binding
          • @Binding
            • 🔰Binding State
            • 🔰Binding from StateObject
            • 🔰init Binding
            • ❗return Binding
      • 🔰view layout
        • 🔹.padding( )
        • 🔴Position
        • 🔸frame
          • 🌀view + .frame()
          • 🔹.frame()
            • ✨TestIdealSizeView
            • ✨TestFrameView
        • 🔸view size
          • 🔴Size Classes
          • 🔴Dynamic Type Sizes
            • 🌀DynamicTypeSize+ext
          • 🔸ideal size
        • 🎁stacks
          • 📦ZStack
          • 👔AdaptiveHStack
          • 👔StackForEach
        • 🎁grids
          • 📦LazyVGrid
            • 🖼️StandardGradientGrid
          • 🟠grid layout algorithm
          • 📦GridItem
            • 🔰adaptive column
            • 🔰flexible column
            • ✨NColumns
          • 👔VGridForEach
            • ✨TestLittleSquares
          • 👔ScrollVGridForEach
            • ✨TestSVGFE
          • ✨Grids ⟩ examples
            • ✨Smileys
            • ✨Grid
              • 📦GridLayout
            • ✨MyGrid
              • ⛔Generic parameter '...' could not be inferred.
            • 🐞problem with .readSize()
            • ✨ItemsView
              • 🖼️TestItemsView
              • 📦RatioRetainingLayout
              • 🎛️SizeRatioControl
              • 🅿️IndexedGridLayout
        • Adaptive Layout
        • Alignment
          • Implicit Alignment
          • Custom Alignment within ZStack
          • 🔰各種對齊 (alignment)
        • 🌿Layout ⟩ Types
          • 📦TimelineView
        • ⛔Cannot convert value of type 'Self' to expected argument type 'Binding<C>'
      • 🔰view actions
        • 🔰delete item from list
        • 🔰add item to list
      • 🔰view environment
        • 🔸environment object
        • 🔸environment value
          • 📦dismiss
        • @Environment
          • .editMode
        • @EnvironmentObject
      • 🔰view groupings
        • 🖼️ForEach
          • 🔹.onDelete
          • ⚖️List vs. ForEach
          • ✨ForEach examples
      • 🔰navigation
        • 🔸navigation bar
        • 📦NavigationStack
        • 📦NavigationSplitView
        • 📦NavigationLink
      • 🔰view modifier
        • ✨examples
          • .nsfw()
          • .roundedBorder()
          • .neumorphic()
        • 🔰add modifiers to Xcode
        • 🔰conditional modifier
        • 🔰layout modifier
        • 🔰rendering modifier
        • 🔰adjusting text
        • 🅿️ViewModifier
      • 🔰drawing views
        • 🔸foreground
          • 🔸foreground element
          • 🔸foreground style
            • 🔹view.foregroundStyle()
            • 🔹ShapeStyle.foreground
        • 🔸background
          • 🔸background style
          • 🔹.background()
        • 🔸blend mode
          • ✨.destinationOut
        • 🔸mask
          • 🔹view.mask()
        • 🔸shadow
          • 🔰container + shadow
          • 📦ShadowStyle
          • 🔹view.shadow()
        • 🔹view.clipShape()
          • 🐞mismatching types
        • 🔹veiw.compositingGroup()
      • 🔰measuring views
        • 📦GeometryProxy
          • 🌀GeometryProxy+ext
        • 📦 GeometryReader
          • 🔰GeometryReader 的對齊方式
      • 🔰Configuring Views
      • 🔰events
        • 🔹.allowsHitTesting()
      • 📦ViewBuilder
        • ViewBuilder transforms
        • support for stored properties
      • 🔰Optional Views
      • 🅿️View
        • .dimension()
          • 🌀Path+
          • 👔DimensionPositions
          • 👔WidthDimension
          • 👔HeightDimension
          • 👔LeftArrow
          • 👔LeftArrowShape
          • 👔UpArrow
          • 👔UpArrowShape
        • id(_:)
        • .badge()
        • .border(), .borderLeft() ...
        • .hideIf()
        • .logType()
        • .getSize()
        • .grids()
        • .offset()
        • .onChangeSize()
        • .onDrag
        • ❌.readSize()
        • resizableFont()
        • .show(if:)
        • .shadowedBorder()
        • .testFrame()
        • view.actOnSelfWidth()
      • 📦Link
      • 🔰Swipe Actions
      • 🔰3D transform
      • ⭐Live Activites
      • 🔰life cycle
    • 🔰styles
      • 🔸current style
    • 🔰lists
      • 📦List
        • 🅿️ListStyle
        • ⭐list background color
    • 🎛️controls
      • 🔰pickers
        • 🎛️Picker
        • 🎛️DatePicker
      • 🔰toolbar
      • 🔰FocusState
      • 📦Divider
      • 📦Text
        • 📦Font
          • 🔰custom font
        • 🔰text formats
          • 🔸no wrap
        • 🔰Markdown
        • ❓math equations❓
        • ⭐number of lines
      • 📦Image
        • 🔹image.renderingMode()
        • 🔸template image
        • 🔰SF Symbols
        • 🍄ImageRenderer
      • 📦Label
        • Label Styles
          • Label ⟩ custom styles
      • 📦GroupBox
      • 📦ControlGroup
      • 📦Section
      • 📦ScrollView
      • ⭐ShareLink
      • 🎛️Button
        • 🔰Button Roles
        • 🔰Button Styles
          • 🅿️PrimitiveButtonStyle
          • 🔰Button with Materials
          • Button ⟩ custom styles
      • 🎛️EditButton
      • 🎛️ProgressView
      • 🎛️TextField
        • TextField ⟩ formats
          • ✨.currency
        • TextField ⟩ styles
          • textField.style(_:)
      • 🎛️Toggle
        • 🔰Toggle Styles
      • 🎛️SecureField
      • 🎛️Slider
        • 🔰Slider label position
      • 🎛️Gauge
    • 🔰shapes
      • 🔰transform shape
        • 🔹shape.stroke()
          • 🌀StrokeStyle
          • ✨MarchingAnts
      • 💈正圓變成正五邊形
      • 🅿️Shape
        • 📦AnyShape
        • 🔸fill
          • ✨even-odd fill mode
          • .evenOddFill
        • 🌀Shape + ext
          • shape.outlined()
        • ✨RoundedCorners
        • ✨Helper Shapes
          • 💜LineShape
          • 💜GridLinesShape
          • 🖼️GridLines
          • 🖼️Line
          • 🖼️Pin
          • 🖼️Point
        • ✨Sports Car in Sunset
          • 💜Vehicle.CarBodyShape
          • 🖼️Vehicle
        • 👔Polygon
      • 🅿️ShapeStyle
        • 📦Color
          • 🔸color.gradient
          • 🔰Theme
        • 📦Gradient
        • 📦ImagePaint
        • ♦️.shadow()
        • .white()
        • ShapeStyle+LinearGradient
        • 📦Material
      • 🔰Matched Geometry Effect
        • ✨MGE ⟩ animation
      • 📦Path
        • path.fit()
        • path.line()
        • path.transform
      • 📦Canvas
      • 📦Anchor<T>
    • 🎁container
      • 🎁collection
      • 🎁layout
        • ⭐Grid
        • ⭐ViewThatFits
        • ⭐AnyLayout
        • ⭐Layout
      • 🎁presentation
        • ⭐bottom sheet
        • 🎁TabView
          • ✨tabs with tag
    • 🚦data flow
      • 🚥Preferences
        • 👔ViewPreference
        • 🅿️PreferenceKey
          • FirstNonNil<T>
          • AllValues<T>
          • MaxValue<T>
        • 🚥Anchor Preferences
        • ✨Preferences ⟩ examples
          • ✨views with same width
            • .reportWidth() ...
          • ✨selected button with underline
    • 🏎️animations
      • 🔰implicit vs. explicit
      • 🅿️Animatable
        • 🅿️GeometryEffect
        • 🔸Animatable Modifiers
          • ✨.tapToShake()
      • 📦Animation
      • 🔰delay
      • 🔸Animation Curves
        • 🔸Bezier Curves
        • easeInOutExp
      • ✨Animations ⟩ examples
        • ✨Spinner
        • ✨Wheel of Fortune
        • ✨Loading Indicators
      • 🔰Transitions
        • 🔰custom transitions
        • 📦AnyTransition
          • AnyTransition.combined()
        • ✨transition ⟩ scale
        • ✨combining transitions
    • 👆Gestures
      • 🔰update gesture states
      • 🔰update view states
      • 🚥GestureState
      • 👆Long Press
      • 👆Drag
        • 👔.draggable()
          • 🖼️HandlePoint
      • 🔰Combining Gestures
        • 👆.sequenced()
          • ✨long press + drag
    • 🔰Presentations
      • 🔰Launch Screen
      • 🔰External Screens
      • 🔰Refreshable Views
      • 🔰Alert
      • 🎛️Confirmation Dialog
    • 🔰Debugging in SwiftUI
    • 🎹keyboard
    • 🔰for mac
    • 🚫deprecated
      • 🎁NavigationView
        • .navigationViewStyle(_:)
  • 🎛️widgets
  • 🎁Data Structures
    • Graph
      • Tree
  • 🧠Algorithms
    • Searching
      • Binary Search
    • Hashing
    • Sorting
      • sort using key paths
      • ranking list
      • Merge Sort
    • Filtering
    • Path Finding
      • A*
  • ⛱️Swift Playgrounds
    • Playground Book
      • Structuring Content
    • 檔案結構
      • 💾Manifest.plist
    • 使用模組
    • 📚Learn to Code 2
      • 型別
        • 🔸CharacterName
        • 🍄NodeWrapper
        • 👔ItemID
        • 🅿️Learn to Code 2 ⟩ Animatable
        • 🅿️Item
        • 🍄Actor
        • 🍄Expert
        • 🍄Portal
      • 關卡
        • Variables
          • 檢查相等值
          • 計算開關數量
          • 收集總數
        • Types
          • 開啟與關閉傳送門
          • 關閉傳送門
        • 創造世界
    • 編碼社群
    • Swift Playgrounds Subscription
  • 🥁Audio / Video
    • .speak()
    • Language Tags
  • ⛔Errors
    • ⛔CompileDylibError: Failed to build XXX.swift
    • ⛔Fatal error: String index is out of bounds
    • ❌Internal error: missingPackageDescriptionModule
    • ❌Argument type 'xxx' does not conform to expected type '_FormatSpecifiable'
    • ⛔️ escaping closure captures mutating 'self' parameter
    • ❓iPad/iPhone is Busy: Fetching debug symbols for ...
    • ❓Class _PointQueue is implemented in both ...
    • ⛔Protocol '...' can only be used as a generic constraint because it has Self or associated type
    • ⛔non-nominal type `...` cannot be extended
    • ⛔cannot assign value of type 'T' to type 'T'
  • 附錄
    • 🧩Swift Package
      • Package.swift
      • version number
      • Swift Package Index
      • 3rd party packages
    • 🔰Design Patterns
      • MVC
      • MVVM
      • DIP
    • 🛠️Xcode
      • 🔰build schemes
      • 🔧Instruments
      • 🤖Compiler Directives
        • @available, #available
        • #if ... #else ... #endif
        • #file, #line, #function
      • 🎹shortcuts
      • 🔰Documentation
        • 🔰DocC
      • Source Control
        • Merge
      • Preview
        • Preview Devices
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  1. SwiftUI
  2. animations

Animatable

Previousimplicit vs. explicitNextGeometryEffect

Last updated 5 months ago

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⟩ ⟩ ⟩

Animatable describes how to animate a view with respect to some change in the view's data.

  • : required computed property (with default implementation by doing nothing)

  • conforms to Animatable

Use Animatable when you are unable to achieve the animation you want with or .

// ⭐️ 一維的 `animatableData`
var animatableData: CGFloat {
    get { return sides }
    set { sides = newValue }    // ⭐️ set new animation value
}
// ⭐️ 二維的 `animatableData` (AnimatablePair)
var animatableData: AnimatablePair<CGFloat, CGFloat> {
    get { AnimatablePair(sides, scale) }
    set {                        // ⭐️ set new animation value
        sides = newValue.first
        scale = newValue.second
    }
}

👉 see: Polygon

Text("\(animatableData)")

這樣的寫法,並不會產生任何動畫❗️

related protocol: `Animatable`

  • `AnimatablePair<First, Second>`: animate ove 2 parameters

  • `Animatable`: Angle, CGPoint, CGRect, CGSize, EdgeInsets, StrokeStyle, UnitPoint.

  • `VectorArithmetic`: AnimatablePair, CGFloat, Double, EmptyAnimatableData, Float.

  • When you use the animation(_:) modifier on an equatable view, SwiftUI animates any changes to animatable properties of the view. A view’s color, opacity, rotation, size, and other properties are all animatable.

  • When the view isn’t equatable, you can use the animation(_:value:) modifier to start animations when the specified value changes.

  • Polygon

  • Vehicle - tap to animate.

  • MGE ⟩ animation - matched geometry effect.

  • shapes

  • Animatable Modifiers is animatable.

並不是 @State 屬性,所以如果在 view 中使用類似:

By conforming to , you are able to effectively decouple the animation of your view from the concept of duration, as you give SwiftUI the ability to interpolate arbitrarily between two different values for . This is also the reason why must conform to , which provides the runtime means to add, subtract and scale the animated values as necessary to generate data points for each frame of the animation over an arbitrary time interval.

To expose two properties as animatable, wrap them in an .

nest inside each other to support any number of properties.

To examine how SwiftUI interpolates between different values during an animation, we can add log statements to the setter of or the body method of the .

QVIK ⟩ #todo

Hacking with Swift ⟩

Zak ⟩

Big Mountain Studio ⟩ - animating Shape.

SwiftOnTap ⟩ ⭐️

SwiftUI Tutorials ⟩ ⟩

⟩

⟩

(protocol)

- conforms to (protocol).

(struct)

⟩

(struct)

View ⟩ ⟩

- applied to equatable view

- applied to equatable value (non-equatable view)

Shape can be animated. (👉 )

Animations ⟩ examples - use .

🔰
🏎️
🅿️
SwiftUI
animations
Animatable
animatableData
Shape
animation(_:)
withAnimation(_:_:)
animatableData
Animatable
animatableData
AnimatableData
VectorArithmetic
AnimatablePair
AnimatablePairs
animatableData
animatable modifier
Part 1: Paths
Part 2: GeometryEffect
Part 3: AnimatableModifier
Basics of SwiftUI Animation
Customizing animations in SwiftUI
Mastering transitions in SwiftUI
Trapezium - Part 3: Animating
SwiftUI Animations Mastery (iOS 14)
Animatable
Animating Views & Transitions
Add Animations to Individual Views
SwiftUI
Animations
Animatable
animatableData
VectorArithmetic
AnimatablePair
Drawing and Animation
Animation
withAnimation(::)
Graphics and Rendering
.animation(_:)
.animation(_:value:)
Mark
animatableData