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Introducing Function Builder
potatotips #267
2019/12/17
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Akihisa Sengoku
@akihisasen
גࣜձࣾαΠόʔΤʔδΣϯτ
AmebaʢΞϝʔόʣ
iOSΤϯδχΞ
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Function Builderͱʁ
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4XJGU6*ͰΘΕ͍ͯΔΫϩʔδϟʔతͳͷʁ
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%4-Λॻ͘͜ͱ͕Ͱ͖ΔΑ͏ʹͳͬͨʁ
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4XJGUͰՃ͞Εͨ৽ػೳ
1SPQPTBM 'PSVN
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BuilderͷϧʔϧʹैͬͯؔΛ
҉తʹม͢Δ͜ͱ͕Ͱ͖Δ
#VJMEFSΛ
దԠͨؔ͠
#VJMEFSϧʔϧʹ
Ԡͯؔ͡Λม
#VJMEFSΛఆٛ
#VJMEFSΛ
దԠ
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Function BuilderʹΑΓ
ಠࣗͷDSLΛΑΓ࡞͘͢͠ͳͬͨ
- Structure Data (json, XML)
- UI View Hierarchies
- HTML DOM Hierarchies
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࡞Γํ!
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#VJMEFSͷ࡞ํ๏ʹ͍ͭͯ
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Builderͷ࡞ํ๏
1. struct or classͷલʹ`@_functionBuilder`Λ͚ͭͯ
ఆٛ͢Δɻ
2. static func Ͱ `buildBlock(_ components:
Component...) -> Component` Λఆٛ͢Δɻ
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ͦͷଞͷbuildͷ࣮
• buildExpression(_ expression: Expression) ->
Component
• buildFunction(_ components: Component...) -
> Return
• buildDo(_ components: Component...) ->
Component
• buildOptional(_ component: Component?) ->
Component
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'VODUJPO#VJMEFSͷ༻ํ๏
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Function Builderͷ༻ํ๏
1. Function BuilderΛ༻͍ͨؔ͠ͷલʹ
@FunctionBuilder໊Λ͚ͭΔ
2. BuilderͷbuildBlockʹରԠ͢ΔҾΛɺ
վߦ۠ΓͰهड़
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ؔͷҾͷΫϩʔδϟͰFunction Builder
Λ༻͢Δ͜ͱ͕Ͱ͖Δ
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ϓϩμΫτಋೖ
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SwiftUI
HTML
NSAttributedString
Network
UIKit
ϓϩμΫτಋೖ: DSL
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Amebaͷಋೖྫ
NSAttributedStringͷIFΛ៉ྷʹ
5JQT
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What's New in Swift - WWDC2019
https://developer.apple.com/videos/play/
wwdc2019/402/
Function Builder - swift-evolution
https://github.com/apple/swift-evolution/blob/
9992cf3c11c2d5e0ea20bee98657d93902d5b17
4/proposals/XXXX-function-builders.md