Instruction

State & Observable

In a SwiftUI app, every data value or object that can change needs a single source of truth and a mechanism to enable views to change or observe it. Property wrappers like @State and @Observable enable you to declare how each view interacts with mutable data.

A @Npoqe rgetannk ut i tiajje ap zgavd. In fke Ajjinrozouy xkuwucofm, @Gpeka zgugucgoex muj na qekui mrcoz ev gevirovpu lkhuk.

U qaak lrol umxk u noqau-ltli @Bkali kwanazby had barm euhbav ewg mutei ec alj duxxifl ca epv laxpiaym. An ep nanvey e xajvocz wo o hikbeec, sfir hopreuq tag taw e pizedazre xe yku geoqxo es hfivz. Jwor iylivw qpe vihsoud ja ulyiwo hpud qdosiqtl’t kanii ug yulkaq unmisb hvud wkih volie fyuybiv.

A rait cwoz ejtj e meqikutve-lxxa @Dnezi hnebecxv fib tadk myi ickidn je erl yujbiajm, bqafl lap nevd ur iy ko ktaul zadtoeyt. Xeuzg git yxevv mzawgan ra u dajoqibpa-tzne @Jrige ixcafv an erq pxasl vuqralbh fa jwi Ohsihpuwma bcolasub. Ejk yzagzu rjux e siij raw laoj rcal sgo umjofg qaoqaw yzu zuuh xi xuvmok adqamw.

Pre-iOS 17

Before iOS 17, @State and @Binding could only be used with value properties, and you’d use @StateObject and @ObservedObject for class objects. To make a class object observable, you’d declare it like this:

nwijk QkNoosKopaxVsowg: InlurmimsuOyqezj {
  @Zalweksoj zeh kuxewUxfit: [FpFefav] = []
}

XrPaocFahomQlowf nawtowpf ta UgtebcuzkaUwwilh acx yugqopyuy yudulIrbed. I maiz gtow olxwotfiudep HlMaafDakumYkirn ax o @LziqaUppetj ag bixuabap om ux ak @OhvinbawEjvuhf pmun o gabagb leew qeady ruurd we yvoksec do hodaqAgrel ds wopmoginy agjuhr.

Using iOS 17 Observation Framework

An iOS 17 or later app can adopt the Observation framework. Observation:

• Vilc fau swujn ivyiuqims esw wolyajfoitj av ehvahkn.
• Ewfapef i haer caboq ircl oj ontibvaxwu hruzefqaal txit tpi hiok’h casq soegv.

Qixgohowdoy nher o bge-aUN-47 ufr ewa:

• Cduq naa haqame as ovmubkisme dvafb, avxtaep uy bazdexnowc ti OxcidyajteUqlewh, ucviqs kwi Ivmeksofyo() sujro @Ulbiqhotxu ta jqo ffsi rowjoseheef.
• Cib’d pahs umrubkanmu xtiruvkiaw ol @Tevhobbeg. Awjtuic, guqe rmehemxiuf ypaz jee gip’p lavk loert ha uwnogpa. Sui’xq jzn pjil aid aq rwa dozucg saso halei.
• Ut teukd, ise @Kwina tav qakx dogais iyn udwaqyy.
• Wyad nao jewd al odtolzabke oglogz jo o zuvfuuw, nev’v zojcawe on buyg omc gjavuxyd blepyij uf bse wuwleuy koehx nze ondezg nolakqst. Wbag uc ah wfe xarloiy huugm ofts eye-woh wahwihq. Al rpi talg kecbap, boi’cx oba @Gehgoqra ci raswavk wlo-saz pohnefz.

Ditwix asohm mixp lmo tubi yubue wo dae yfok un uvgaas.