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Swift 5.9 からの Observation はiOS17 未満 からも使えて stru...

yimajo
February 14, 2024

Swift 5.9 からの Observation はiOS17 未満 からも使えて struct の変更検知もできるんすかね?

- @_spi(SwiftUI)の部分いついてはよくわからんので削除
- https://x.com/yimajo/status/1774309468819579146?s=20

yimajo

February 14, 2024
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  1. func renderCars() { var car1 = .init() var car2 =

    .init() withObservationTracking { print(car1.name) print(car2.name) } onChange: { } } XJUI0CTFSWBUJPO5SBDLJOH @PO$IBOHF 044ͳBQQMFTXJGUΛਅࣅͯ͠ɺόοΫϙʔτΛ࡞ΕΔ
  2. func renderCars() { var car1 = .init() var car2 =

    .init() withObservationTracking { print(car1.name) print(car2.name) } onChange: { } } 0CTFSWBUJPO3FHJTUSBS 0CTFSWBUJPO3FHJTUSBS access XJUI0CTFSWBUJPO5SBDLJOH @PO$IBOHF 044ͳBQQMFTXJGUΛਅࣅͯ͠ɺόοΫϙʔτΛ࡞ΕΔ
  3. func renderCars() { var car1 = .init() var car2 =

    .init() withObservationTracking { print(car1.name) print(car2.name) } onChange: { } } 0CTFSWBUJPO3FHJTUSBS 0CTFSWBUJPO3FHJTUSBS access @"DDFTT-JTU @"DDFTT-JTU addAccess XJUI0CTFSWBUJPO5SBDLJOH @PO$IBOHF 044ͳBQQMFTXJGUΛਅࣅͯ͠ɺόοΫϙʔτΛ࡞ΕΔ
  4. func renderCars() { var car1 = .init() var car2 =

    .init() withObservationTracking { print(car1.name) print(car2.name) } onChange: { } } 0CTFSWBUJPO3FHJTUSBS 0CTFSWBUJPO3FHJTUSBS access merge @"DDFTT-JTU @"DDFTT-JTU addAccess XJUI0CTFSWBUJPO5SBDLJOH @PO$IBOHF 044ͳBQQMFTXJGUΛਅࣅͯ͠ɺόοΫϙʔτΛ࡞ΕΔ
  5. func renderCars() { var car1 = .init() var car2 =

    .init() withObservationTracking { print(car1.name) print(car2.name) } onChange: { } } 0CTFSWBUJPO3FHJTUSBS 0CTFSWBUJPO3FHJTUSBS access merge @"DDFTT-JTU @"DDFTT-JTU addAccess XJUI0CTFSWBUJPO5SBDLJOH @PO$IBOHF 044ͳBQQMFTXJGUΛਅࣅͯ͠ɺόοΫϙʔτΛ࡞ΕΔ
  6. BQQMFTXJGUϦϙδτϦʹίʔυ͸͋Δ w XJUI0CTFSWBUJPO5SBDLJOH @PO$IBOHF  w IUUQTHJUIVCDPNBQQMFTXJGUCMPCTXJGU3&-&"4&TUEMJC QVCMJD0CTFSWBUJPO4PVSDFT0CTFSWBUJPO 0CTFSWBUJPO5SBDLJOHTXJGU-- w

    0CTFSWBUJPO3FHJTUSBS w IUUQTHJUIVCDPNBQQMFTXJGUCMPCTXJGU3&-&"4&TUEMJC QVCMJD0CTFSWBUJPO4PVSDFT0CTFSWBUJPO0CTFSWBUJPO3FHJTUSBSTXJGU
  7. func renderCars() { var car1 = .init() var car2 =

    .init() withPerceptionTracking { print(car1.name) print(car2.name) } onChange: { } } @"DDFTT-JTU 0CTFSWBUJPO3FHJTUSBS @"DDFTT-JTU 0CTFSWBUJPO3FHJTUSBS access merge addAccess XJUI1FSDFQUJPO5SBDLJOH @PO$IBOHF PO$IBOHF͸ܧଓతʹಈ࡞͢ΔΘ͚͡Όͳ͍
  8. withPerceptionTracking { } onChange: { } XJUI1FSDFQUJPO5SBDLJOH @PO$IBOHF withObservationTracking {

    } onChange: { } 0CTFSWBUJPO ࢖͑Δ ࢖͑ͳ͍ 0CTFSWBUJPO3FHJTUSBS "DDFTT-JTU 0CTFSWBUJPO
  9. func render() { withObservationTracking { } onChange: { } }

    ཧղͷͨΊɺXJUI0CTFSWBUJPO5SBDLJOHͰ4XJGU6*ߋ৽͢ΔΠϝʔδ struct SomeView: View { let car = … var body: Some View { Text(“\(car.name)”) FooView() { // userΛมߋ } } } ༧૝جຊͱͯ͠͸4XJGU6*ͷ֘౰7JFXҎԼΛߋ৽͍ͨ͠ɻ ͔͠͠TUSVDUͷมߋͰίϐʔ͞ΕҰҙੑ͕ͳ͘ͳΔͱɺ֘౰7JFXΛݟ͔ͭΒͳ͍ͷͰߋ৽Ͱ͖ͳ͍ɻ "DDFTT-JTUʹ͸7JFXͷ໊લΛอ͍࣋ͯ͠ΔΘ͚͡Όͳ͍ɻ
  10. ਌͕!0CTFSWBCMFDMBTTͳΒྑ͍ɻ ͦͷDMBTTͷϓϩύςΟʹTUSVDUͳ΋ ͷ͕͋Δͱ͢ΔɻTUSVDUͰ͋Δϓϩύς Οͷมߋ͸ͦͷ਌ͷΦϒδΣΫτͷมߋ ͱͯ͠ݕ஌Ͱ͖Δɻ @Observable class Car { struct

    Engine { var name = “V8” } @ObservationTracked var name = String() @ObservationTracked var engine = Engine() } DBSFOHJOFOBNFΛม͑ͯ΋ɺFOHJOFࣗମ͕ίϐʔ͞ΕΔɻ ݕ஌͸Ͱ͖͍ͯΔ͕OBNF͚ͩͷมߋʹͱͲ·͍ͬͯͳ͍ɻ
  11. IUUQTHJUIVCDPNQPJOUGSFFDPTXJGUDPNQPTBCMFBSDIJUFDUVSF 5IF$PNQPTBCMF"SDIJUFDUVSF @ObservableState struct State { @ObservationStateTracked var name =

    “” } QPJOUGSFF public protocol ObservableState: Perceptible { var _$id: ObservableStateID { get } mutating func _$willModify() } IUUQTXXXQPJOUGSFFDPFQJTPEFTFQPCTFSWBCMF BSDIJUFDUVSFTUSVDUVSBMJEFOUJUZ