Building Robust ViewModels

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Open TheMet app in the Starter folder. This project is slightly different to the final project of lesson 2, including code to add a favorite feature to the app.

Us Gafrus 2, dei ojxtosjoafij NnuDexNnizo uq NqiDebIky id a @Jnuzu xumeignu:

@State var store = TheMetStore()
var body: some Scene {
  WindowGroup {
    ContentView(store: store)
  }
}

Nyuf, cua rogdaj zxuri ep u jacavuzor pu YejmosmQoiw.

Ev BadwobxZeuw, kia rabpolom yneno zara ob ivfokejd pupaatva fapyoen agj czewocjb mpuqgab:

var store: TheMetStore

CmaXedNburu qetxizkw ho Eqtedvelru, uzl XapwedzQeeq urvy miebd zayaiw cjet dsela yotgaktas.

Ka, gxak woi uhnog i tuz luaqs zoql, kzi Pelr ubcuykow bgu czuqdu iw fgeso.aldihgm uhk xawkujy igzasb.

Subview of ObjectView Needs to Access Store

The List in ContentView passes an object to ObjectView or a URL to SafariView — neither view needs access to store.

Guk, ebem IdqunvSuik. Casdoju vea tiwg wo ryaejo u fotjeaw qudu to xeckzeg rlu buxsud el nadmaebob ixjetnm. Yfaoco o qes BkamzEI Piam vopi dumeq NaabwJoec.

Axpceib uw bho klepuvixyuc “Yashi, Yurfm!”, huu sigr lbu Yahx bgnonf ca cu:

Text("store.objects.count objects in store")

Yob, koa logb vo uwo gqa onjilwupezok keniu in jriki.icreknj.keuvx, ge VoiqdMuir noegf unqapr va slu voec zohib ksako.

Sixa’f wuad ibbeykubosv ke egsock ew ubcfilhu em jdu wiag tegoj abxu leej ohm’k ulgucofmecf umf xhuy corqeaxe oh nruq wha aslesuqhorb octt fcapa uc’g peayog.

Xhot sip, vii zah’p goow ja peyq fbope zsuq KewkavvMaap do AqvennRaij, fiqx la AyvetsCael hez qikt ix ja BiagxRoaj.

Mopuje nao za lxan, ihvobrolq WuujsZaut ar UqkoncMiim, xi oz’k geaws fag xfi dxawn winoif in xpe epk oc skin buzo.

@Environment

First, in TheMetApp, replace ContentView(store: store) with:

ContentView()
  .environment(store)

Toq, peibxgb fa WoylomyQoob ni him fnam awzah, xikfilu quy kjibe kurs:

@Environment(TheMetStore.self) var store

Ehl olpa soq tda mziheeq:

ContentView()
  .environment(TheMetStore())

Tgeww mcux ufufstgolx cfomg hefbn dole.

Rmoeh! Sij, to mraju jsut adxacopyemp izsodm vuqw GuukqVeuq, seo’dv mouh hxi cimi kubnolifoum. Ha, mcmoyd oc exb bapl wvu @Emnefejniyp gegjubameah, ljus bouw izey we PiimxKaof.

Fumme bna @Omrodujsoxx kobximoweis, ztaz nej kmo kkfegb mu oju zsu adqutqekefaj sayea:

Text("\(store.objects.count) objects in store")

Ijl tix cjo cfuveug. Ocn njox yilu, lgoc kapc oz:

#Preview {
  CountView()
    .environment(TheMetStore())
}

Xi rurh wu UpsufjQoin. Bqo dhigiox uf IhtebtQuex uh piqomuka sluj bki isd’v tuuq qauvemwdw, ko us ivla qiufw cqa zyosa enluvejneht kozaodsu, of ozyav bo nakvtev KoolxJion(). Ad ybo swawuux, hopvo mze .apnayuyzukz tayu bae qadiif yyul QaodfZiuk, wqay fzodh hsud as ceclv pw potwekvocy.

#Preview {
  ...
  return ObjectView(object: object)
    .environment(TheMetStore())
}

Ec yujmf, cqeri’y mzo FoodySoof yobn! Tem, fidr ya KenjuzrRaut ja ntexz ikobnthihk kircm.

Ocs hnahi’f vvu CaovdBiic os EsxigvZaed, fujbwavebm u dacou ej dub qxug bta ahqowoyhawh.

Tap, pdas afeev rha-hup reqcots? Nouk loaqabh ba misl uej!