Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Demystify SwiftUI 要約 / Summary of Demystify Swi...
Search
Elvis Shi
June 28, 2021
Programming
750
3
Share
Embed
Copy iframe code
Copy JS code
Copy link
Start on current slide
Demystify SwiftUI 要約 / Summary of Demystify SwiftUI
Elvis Shi
June 28, 2021
More Decks by Elvis Shi
See All by Elvis Shi
為什麼你並不需要ViewModel / No, you don't need a ViewModel
lovee
1
540
@Environment(\.keyPath)那么好我不允许你们不知道! / atEnvironment keyPath is so good and you should know it!
lovee
0
530
ゼロから始めるPreferenceの実装 / Let's implement Preferences from scratch
lovee
0
160
Kotlin エンジニアへ送る:Swift 案件に参加させられる日に備えて~似てるけど色々違う Swift の仕様 / from Kotlin to Swift
lovee
1
400
個人アプリを2年ぶりにアプデしたから褒めて / I just updated my personal app, praise me!
lovee
0
770
How did I build an Open-Source SwiftUI Toast Library
lovee
1
180
SwiftUIで使いやすいToastの作り方 / How to build a Toast system which is easy to use in SwiftUI
lovee
3
1.3k
SwiftUIで二重スクロール作ってみた / When I tried to make a dual-scroll-ish view in SwiftUI
lovee
1
390
Observation のあれこれ / A brief introduction about Observation
lovee
3
450
Other Decks in Programming
See All in Programming
AIの中の人になってみる
htkym
0
170
高専、大学編入、そして未踏へ〜プロダクト開発とキャリアの歩み - Technical College, University Transfer, and On to “Mitou” / My Journey in Product Development and Career
pkmiya
0
140
AI時代に学ぶ 好きなルール 嫌いなルール Linter編
shorty5121
0
860
業務時間外もAIに働いてもらう話
colorful12
3
10k
이 함수, 실패하면 어떻게 되나요? null부터 Rich Errors까지, Kotlin 에러 처리 15년
haeti2
0
140
ハーネス設計入門 〜プロンプト、コンテキストの次〜
kinopeee
54
36k
Deep dive into the select statement (GopherCon UK)
jespino
0
170
in-process GraphQL のすすめ #ginzajs
izumin5210
4
1.5k
[DroidKaigi 2026] Bring your own phones to Gradle Managed Devices
f2lk
0
110
AIエージェント時代のコードレビューを設計する
nogu66
6
2.5k
Hello, Hiroshima Geospatial Data! — Exploring DoboX with Python
ra0kley
0
170
高専キャリア LT 発表内容
crysta1221
6
5.6k
Featured
See All Featured
Git: the NoSQL Database
bkeepers
PRO
432
67k
Become a Pro
speakerdeck
PRO
31
6.2k
Documentation Writing (for coders)
carmenintech
77
5.5k
Gemini Prompt Engineering: Practical Techniques for Tangible AI Outcomes
mfonobong
2
520
Fashionably flexible responsive web design (full day workshop)
malarkey
408
67k
The Language of Interfaces
destraynor
162
27k
GitHub's CSS Performance
jonrohan
1033
470k
A brief & incomplete history of UX Design for the World Wide Web: 1989–2019
jct
2
500
Context Engineering - Making Every Token Count
addyosmani
9
1.1k
Tell your own story through comics
letsgokoyo
1
1.1k
Agile that works and the tools we love
rasmusluckow
331
22k
We Analyzed 250 Million AI Search Results: Here's What I Found
joshbly
1
1.9k
Transcript
%FNZTUJGZ4XJGU6*ཁ f o r : 6 . & .
* T X J G U G F BU ) " , "5" T X J G U ʙ 8 8 % $ 3F DBQ ʙ
} var employedBy = "YUMEMI Inc." var job = "iOS
Tech Lead" var favoriteLanguage = "Swift" var twitter = "@lovee" var qiita = "lovee" var github = "el-hoshino" var additionalInfo = """ ΠψͰ͕͢ɺԿ͔ʁ """ final class Me: Developable, Talkable {
˞ೣͰྫΛ্͍͛ͯ·͕͢ɺൃදऀΠψͰ͢ɻ
࣌ؒ ҧ͏࣌ؒͷ ಉ͡ೣʁ
࣌ؒ ͦͦ ҧ͏ೣʁ
ࣸਅ͚ͩͰஅ͕Ͱ͖ͳ͍ w ҧ͏ೣͰͱͯࣅͯΔ͔͠Εͳ͍ w ಉ͡ೣͰ࣌ظʹΑͬͯݟ͕ͨҧ͏͔͠Εͳ͍ w அ͢ΔͨΊʹՃͷใ͕ඞཁ w ໊લ w
࠼ w FUD *EFOUJUZ
4XJGU6*Λཧղ͢ΔͨΊͷେϙΠϯτ w *EFOUJUZ w -JGFUJNF w %FQFOEFODZ 4XJGU6*͕͋ͳͨͷࢥ͏௨Γͷಈ࡞Λ͍ͯ͠ͳ͔ͬͨΒɺ େ͜ΕΒͷѻ͍͕ؒҧ͍ͬͯΔ͔Βɻ
*EFOUJUZ w େϙΠϯτͷதͰҰ൪ॏཁ w -JGFUJNF%FQFOEFODZɺ*EFOUJUZ͕͋Δ͔Β ͦ͜Γཱͭ w 4XJGU6*ʹछྨͷ*EFOUJUZ͕͋Δ w &YQMJDJU*EFOUJUZʢ໌ࣔత*%ʣ
w 4USVDUVSBM*EFOUJUZʢߏత*%ʣ
&YQMJDJU*EFOUJUZ w ಈతʹมΘΔϏϡʔʹɺ ΤϯδχΞ͕͚ͭΔ*% w ର͕Identifiable ʹద߹͍ͯ͠ͳ͍߹ *%ͷKeyPathΛࢦఆ ͢Δඞཁ͕͋Δ ForEach(cats,
id: \.name) { cat in Text("\(cat.age)ࡀ") } Explicit Identity
&YQMJDJU*EFOUJUZʹٻΊΒΕΔੑ࣭ w ϢχʔΫੑ w ଞͷରͱඃ͍ͬͯ ͚ͳ͍ w ෆมੑ w ͍ͭɺԿճݺͼग़ͯ͠
มΘ͍͚ͬͯͳ͍ ForEach(cats, id: \.name) { cat in Text("\(cat.age)ࡀ") } Explicit Identity
4USVDUVSBM*EFOUJUZ w ߏʹΑͬͯࣗಈతʹ ͚ΒΕΔ*% w JGจTXJUDIจͷذ ͕͋ͬͨΒҧ͏*%͕ ͚ΒΕΔ Structural Identity
if flag { Text("A") } else { Text("B") }
4USVDUVSBM*EFOUJUZͱͷ͖߹͍ํ w ಉ͡ϏϡʔͳΒɺذΛ ͯ͠ߦ͚ͳ͍ w ذΛͤͣʹ͏·͘ *OFSU.PEJ fi FSͳͲΛ ׆༻
Structural Identity if flag { Text("A") } else { Text("B") } ద༻ͯ͠ϏϡʔͷඳըʹӨڹ͠ͳ͍.PEJ fi FSɻ PQBDJUZ QBEEJOH FUD
ͳͥ*EFOUJUZ͕ॏཁ͔ w "OJNBUJPO͢Δͱ͖ͳͲͷஅࠜڌ w Ҡಈ͖͔͢ΫϩεϑΣʔυ͖͔͢ w Ϗϡʔͷ-JGFUJNFΛܾΊΔࠜڌ w ඞཁͳ͘ͳͬͨΒϝϞϦ͔Βফ͢
-JGFUJNF w 4XJGU6*ͷϏϡʔλΠϓܕ w ϏϡʔλΠϓͨͩͷϏϡʔඳըϨγϐ w ϏϡʔλΠϓͷΠϯελϯεࣗମඇৗʹ໋ w ͔͠͠Ϗϡʔͷੜଘظؒͬͱ͍ w
Ϗϡʔඞཁ͕͋ͬͨΒੜ͞Εɺඞཁͳ͘ͳͬͨΒফ͞ΕΔ w ੜ͞ΕͨΒonAppearɺফ͞ΕͨΒonDisappear͕ݺ ΕΔ w @State@StateObjectϏϡʔ͕ඞཁͳ͘ͳͬͨΒফ ͞ΕΔ
-JGFUJNF fl BHUSVF UBQ ࣌ؒ fl BHGBMTF struct Demo:
View { var flag: Bool var body: some View { if flag { Counter() .background(Color.blue) } else { Counter() .background(Color.red) } } } struct Counter: View { @State private var count = 0 var body: some View { Text("\(count)") .onTapGesture { count += 1 } } } fl BHUSVF ফ͞ΕΔ
-JGFUJNF fl BHUSVF UBQ ࣌ؒ fl BHGBMTF struct Demo:
View { var flag: Bool var body: some View { Counter() .background( flag ? Color.blue : Color.red ) } } struct Counter: View { @State private var count = 0 var body: some View { Text("\(count)") .onTapGesture { count += 1 } } } fl BHUSVF ফ͞Εͳ͍ Dependency
%FQFOEFODZ w %FQFOEFODZͨͩͷϏϡʔͷೖྗ w @State@StateObject͚ͩͰͳ͘ɺ @Bindingͨͩͷvarશͯ%FQFOEFODZ w bodyҎ֎શͯ%FQFOEFODZͱߟ͑ͯͳ͍ w %FQFOEFODZ͕มΘͬͨΒɺͦΕʹඥͮ͘Ϗϡʔ͕
࠶ඳը͞ΕΔ w CPEZ͕ݺΕ࣮ͯߦ͞ΕΔ
%FQFOEFODZ 7JFX 7JFX 7JFX 7JFX %FQFOEFODZ %FQFOEFODZ %FQFOEFODZ
·ͱΊ w *EFOUJUZΛ੍͢Δͷ4XJGU6*Λ੍͢Δ w -JGFUJNFΛҙ͠ͳ͍ͱඞཁͳঢ়ଶ͕ফ͑ͯ͠·͏ w %FQFOEFODZͰ࠷ඳը͢ΔϏϡʔΛநग़͍ͯ͠Δ
ࢀߟ IUUQTEFWFMPQFSBQQMFDPNWJEFPTQMBZXXED