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
Property Wrapperで遊ぼう / Play with Property Wrapper
Search
Yutaro Muta
September 11, 2019
Programming
2
230
Property Wrapperで遊ぼう / Play with Property Wrapper
帰ってきた関西モバイルアプリ研究会#3
https://kanmoba.connpass.com/event/137475/
Yutaro Muta
September 11, 2019
Tweet
Share
More Decks by Yutaro Muta
See All by Yutaro Muta
Apple Vision Pro購入RTA 1泊3日弾丸ハワイツアー / RTA: Purchase Apple Vision Pro in Hawaii
yutailang0119
0
580
個人開発のたのしみ / Enjoying personal development
yutailang0119
0
580
バックポートして学ぶ新APIの仕組み
yutailang0119
0
2k
Backport AsyncImage
yutailang0119
0
490
xcrun Essentials
yutailang0119
6
1.1k
Let's Coding SwiftUI on iPad!
yutailang0119
1
410
Back of First Screen AB test of Hatena Bookmark iOS app with Firebase AB Testing
yutailang0119
0
220
Lab of WWDC19
yutailang0119
1
420
First getting started of SwiftSyntax
yutailang0119
2
500
Other Decks in Programming
See All in Programming
OpenAPIを中心に考えるAPI開発入門 / Introduction to API Development with a Focus on OpenAPI
seike460
PRO
2
170
コーンフレークから始める モデリング会話入門
ogurotakayuki
0
370
MetricKitで予期せぬ終了を検知する話 / Detect unexpected termination with MetricKit
nekowen
1
180
Java 22 Overview
kishida
1
180
Azure OpenAI Serviceのプロンプトエンジニアリング入門
tomokusaba
3
700
障害対応を起点としたもっといい開発と運用のサイクル作りのためにできること / Hatena Enginner Seminar #29
polamjag
0
150
Netty Chicago Java User Group 2024-04-17
sullis
0
170
雑に思考を整理する技術と効能
konifar
59
29k
大規模UIKitベースアプリへのTCAの段階的導入/gradual-adoption-of-tca-in-a-large-scale-uikit-based-app
takehilo
1
170
[技育CAMPアカデミア]アイディアを形に!【超入門】スマホアプリ開発〜リリースまでの流れをご紹介
teamlab
PRO
0
370
PHPはいつから死んでいるかの調査
chiroruxx
1
400
VS Code をプロダクトにどう取り込むか
onomax
1
360
Featured
See All Featured
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
14
1.5k
The Cost Of JavaScript in 2023
addyosmani
16
3.9k
Making the Leap to Tech Lead
cromwellryan
124
8.5k
Six Lessons from altMBA
skipperchong
21
3k
WebSockets: Embracing the real-time Web
robhawkes
59
7k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
121
39k
Building Better People: How to give real-time feedback that sticks.
wjessup
355
18k
Practical Orchestrator
shlominoach
182
9.7k
Optimising Largest Contentful Paint
csswizardry
8
2.4k
In The Pink: A Labor of Love
frogandcode
138
21k
GraphQLとの向き合い方2022年版
quramy
32
12k
Bootstrapping a Software Product
garrettdimon
PRO
302
110k
Transcript
Property WrapperͰ༡΅͏ 2019/09/11 @ؼ͖ͬͯͨؔϞόΠϧΞϓϦݚڀձ#3 Yutaro Muta @yutailang0119
• Yutaro Muta @yutailang0119 • Hatena Co., Ltd. @Kyoto •
Conference Staff • builderscon 2017, 2018, 2019 • try! Swift Tokyo 2019, 2020 • try! Swift Tokyo 2020 νέοτൢച։࢝ • https://www.tryswift.co/events/2020/tokyo/en/ Who am I ?
⚠͝ҙ • ڥ • macOS Mojave Version 10.14.6 • Xcode
11.0 GM seed (11M419c)
Property Wrapper
Property Wrapper • https://github.com/apple/swift-evolution/blob/master/proposals/0258-property- wrappers.md • ࠷ॳͷPitchProperty Delegateͱͯ͠ɺMarch 3, 2019ʹొ
• https://forums.swift.org/t/returned-for-revision-se-0258-property-delegates/24080 • Swift 5.1 ~ • ొॳSwift 5.1ʹೖΒͳ͍ͩΖ͏ͱ͍͏ҹ͕ͩͬͨɺWWDCͰApple͕ൃදͨ͠ SwiftUIʹ༻͞Ε͍ͯΔ • Swift 5.1ͷfinal branchingMarch 18, 2019
Property Wrapper • https://github.com/apple/swift-evolution/blob/master/proposals/0258-property- wrappers.md • ࠷ॳͷPitchProperty Delegateͱͯ͠ɺMarch 3, 2019ʹొ
• https://forums.swift.org/t/returned-for-revision-se-0258-property-delegates/24080 • Swift 5.1 ~ • ొॳSwift 5.1ʹೖΒͳ͍ͩΖ͏ͱ͍͏ҹ͕ͩͬͨɺWWDCͰApple͕ൃදͨ͠ SwiftUIʹ༻͞Ε͍ͯΔ • Swift 5.1ͷfinal branchingMarch 18, 2019
https://github.com/apple/swift-evolution/blob/master/ proposals/0258-property-wrappers.md https://github.com/apple/swift-evolution/blob/master/proposals/0258-property-wrappers.md
https://github.com/apple/swift-evolution/blob/master/ proposals/0258-property-wrappers.md https://github.com/apple/swift-evolution/blob/master/proposals/0258-property-wrappers.md
OSS SwiftͰ࣮த
࣮ঢ়گ • େͰ͖͍ͯΔ • https://github.com/apple/swift/pulls?utf8=✓&q=is%3Apr+SE-+0258 • όάใࠂ͔ͳΓ͋Δ • https://bugs.swift.org/issues/?jql=labels+%3D+PropertyWrappers
BugΛ୳ͦ͏
Property WrapperͷΑ͋͘Δྫ
Property Wrapper x UserDefaults
Property Wrapper x UserDefaults • [WWDC 2019] What's New in
Swift • https://developer.apple.com/videos/play/wwdc2019/402 • UserDefaultsΛWrapͯ͠ɺϘΠϥʔϓϨʔτΛ௵͍ͯ͘͠
@propertyWrapper struct UserDefault<T> { let key: String let defaultValue: T
init(_ key: String, defaultValue: T) { self.key = key self.defaultValue = defaultValue UserDefaults.standard.register(defaults: [key: defaultValue]) } var wrappedValue: T { get { return UserDefaults.standard.object(forKey: key) as? T ?? defaultValue } set { UserDefaults.standard.set(newValue, forKey: key) } } } Property Wrapper x UserDefaults
@UserDefault("USES_TOUCH_ID", defaultValue: false) static var usesTouchID: Bool @UserDefault("LOGGED_IN", defaultValue: false)
static var isLoggedIn: Bool if !isLoggedIn && usesTouchID { !authenticateWithTouchID() } Property Wrapper x UserDefaults
defaultValue == nil Ͱ͖ͦ͏ͩͳ
@propertyWrapper struct UserDefault<T> { let key: String let defaultValue: T
init(_ key: String, defaultValue: T) { self.key = key self.defaultValue = defaultValue } var wrappedValue: T { get { return UserDefaults.standard.object(forKey: key) as? T ?? defaultValue } set { UserDefaults.standard.set(newValue, forKey: key) } } } Property Wrapper x UserDefaults x Optional
@UserDefault("USES_TOUCH_ID", defaultValue: nil) static var usesTouchID: Bool @UserDefault("LOGGED_IN", defaultValue: false)
static var isLoggedIn: Bool if !isLoggedIn && usesTouchID { !authenticateWithTouchID() } Property Wrapper x UserDefaults x Optional
@UserDefault("USES_TOUCH_ID", defaultValue: nil) static var usesTouchID: Bool @UserDefault("LOGGED_IN", defaultValue: false)
static var isLoggedIn: Bool if !isLoggedIn && usesTouchID { !authenticateWithTouchID() } Property Wrapper x UserDefaults x Optional
None
@UserDefault("USES_TOUCH_ID", defaultValue: nil) static var usesTouchID: Bool print(type(of: usesTouchID)) //
Optional<Bool> ܕΛݟͯΈΔ
None
ͱ͍͏͜ͱͰ
https://bugs.swift.org/browse/SR-11443
SR-11443 Property Wrapper overwrites type declaration • bugs swiftʹग़ͨ͠
Simple Case import Foundation var value: Any = "value" @propertyWrapper
struct Wrapper<Value> { private let defaultValue: Value init(defaultValue: Value) { self.defaultValue = defaultValue } var wrappedValue: Value { get { (value as? Value) ?? defaultValue } set { value = newValue } } } final class Playground { @Wrapper(defaultValue: nil) var explicitlyOptional: String? @Wrapper(defaultValue: nil) var implicitlyOptional: String @Wrapper(defaultValue: "NonOptional") var nonOptional: String func printExplicitlyOptionalType() { print(type(of: self.explicitlyOptional)) } func printImplicitlyOptionalType() { print(type(of: self.implicitlyOptional)) } func printNonOptionalType() { print(type(of: self.nonOptional)) } } let playground = Playground() playground.printExplicitlyOptionalType() // Optional<String> playground.printImplicitlyOptionalType() // Optional<String> playground.printNonOptionalType() // String
·ͱΊ
·ͱΊ • Property WrapperΛ͍ͯ͠ɺόάใࠂΛ͍ͯ͜͠͏
&OKPZ1SPQFSUZ8SBQQFS 5IBOLT w NVUBZVUBSP!HNBJMDPN w IUUQTUXJUUFSDPNZVUBJMBOH w IUUQTHJUIVCDPNZVUBJMBOH