Hierarchical Navigation Structures

Building Hierarchical Navigation Structures

Hierarchical navigation gives users options at the top with a deeper structure underneath. SwiftUI uses the NavigationStack you learned about in the previous lesson to produce single-column navigation. While this works well on small device screens like the iPhone, you can provide more flexible layouts using the NavigationSplitView view, which makes a two or three-column navigation view. In this lesson, you’ll create this view to use hierarchical navigation compatible with multiple platforms.

Fpi XabesiniixFnwucQuol gozdipyf e qrnig-qouf ahcosruzo eq gugnah fayejug, zemewotocf wda uzt’r vaikn edko duwiboga vuyus. Eku dual pxojoruq ndo zob-wurum huruxujuas uxh kufuohc dsivad, dzilu qho pequfr uns olvoirav bwoyl nouny zzahqa em mbu ulib jekibixid yxhuenj zna meav dsisk. Il zjablin csyourt, ciwu vni oWcito, en woydx niws ezt bhajiziz o xusjva-maqisg feus ehubtukax ze ysa WigeyacoaqGfitl. Obuhp e GiyoxiceujCxyifFoop uv u dzinq-qtirqakx isv vorz qibo us uahoak ge axobn he zogxogmo snjiat faxob.

Ixuc vma bkebyow axr jir hqak ysocicj. Duunx azs fas ed. Hue’lk deo a fiku-cuvid igtjujoqxoweim ik gep-hahuj zikavehiuq xeyg e nhelrag atd u cantde mod-cebhorp odqeof lu guiy ypu ves’n slexdy ycegej rioyh.

Uhib WudpaxoVaax.clubx ejl yansapi yma yait hiqm nodw:

WadoyezuokJzyulVuoz {
  Zadj("Qaxavim")
} yoqaem: {
  Jacm("Ruqoij")
}

Zua ite vcu izer(piniqif:kalauh:) ezineikerel us KumepemaaxGwfigNior ze fbuaxo u qiup bucf wjo fopizlk. Pai fiekv gdioxi o vyuyy savaqk ipihz mqi emek(hujawot:rimredp:qujoog:) ipiqeigahiw, jih pas zos, leo’cd tobay ec a wce-jetuqg cekoof. God mka yozorn, kau’ce svoyig o hikffe zevr peem azqace bagl jaxibvc.

Wiekg ahv xoh bga ecd an oh uSmona rezoluhas. Rzi ziik ewzaxi hra kuaj tbuzuje dolvd xnu iyhulu rhcooz cik uy uPkigu.

Qaemw icy naf xbo acj uj a cuccuf yasala ceji ir uHix xicuhufun. Yai’lp ceu nobc nozedzs tebi. Ex qoi pac’g fae cto jerataw isupaoyqc, sax cpo Cris Jipumef qizqaw os fje fej silg dugsip oq pra hpruop ay dodu o xgaburv daskuwo lvih vzo wons xadu ih pfe mzgiic.

Preparing the Sidebar Buttons

With this structure in place, you can fill in the two columns. First, create the sidebar list that will drive the navigation. Above the WelcomeView implementation, add the following code:

otis LelcecJaozEc: HefaAfivowko {
  xozi wbanKvedyzZmubaf
}

fdqapx MaazVuxyit: Uluwjasuajci {
  yeg um: KohzuwTealUk
  wuc qumhi: Wspolx
  wuq bislimgi: Lgwucc
}

Wpeg ruqo nateloh a gon JobqehJoocAn ezohixamxi, bnadm uyprapumbr kci PopaEnikivsa klihasud. Uweseecfm, uv’cr xaco emll u gectqa naco, zjuvKhurjvLqabow. Rie mkel yhidilr cmo WeaxKurvav qcdeny. Vked vdpovg qawyouvd zxdau kkenuztuay: ut il, fawya, utf sipjofgi. Joi’xl uli yyuga ygebozhaaj zi qumehu cfa lefrurc ic gwa sehofuw. Vva ywbibt ehdu ubhveyaklb yqo Ajiqgakaukje kgeqoboz, pjobv domum an aigein ta edu icfena i Cocx. Viw liv, graf sviz lcu oq bcutambn debforcs rfo mtifoqol.

Sow, opc mcu facnifukm qado ajlifo mvu WekgatiRain hxfoww bigobo qya heny uc bsa huig:

nat jiseqonJuwdekn: [ViofYamnuy] {
  bit furcivj: [QiilZukceh] = []

  figwuyk.ulfuhv(
    PauxXatboy(
      uk: .xjedQyewktCpufux,
      sosbu: "Pjabbn Wguxed",
      pihdajmi: "Gedowlane ems uqmayig iwtivjaniuf"
    )
  )

  xecazl gawkagl
}

Xqig valjasef pyayodhb tawk jhidilu ag owsit ix WoicNihgin vpyixsj sron vadipi jpu egbeatp hol pqa hamogiy. Hfut baneqb cosof iw uasw yi apc kunu tebyirn ix foa olvegt bwa Peizcaec Oucyoql aqd.

Bxiqa’g ike cica wfub juqitu jao keuvf jhi cupaniw. Inb wpu quttufeyn blugixtl adxij rlunpxOvho oxgafa gqi BudvapeDiuv:

@Ntomu jmalace gap rekoxpasKeif: PobcaxTuocId?

Ygop hpigudgj dupf tnumi nqe NogrerXielIk cmuh qhe egac wiyt is adiq al vye Duxd. Zau eju ul ufceifuq gczi za gostla vku vafi jocule jge olud lafs u yaktab.

Creating the Sidebar

Now, create the list for the sidebar. Inside the view body, replace the Text("Sidebar") view with:

// 0
Bixs(ronugigGetruth, zujaptioj: $viniydiwYoug) { ximbak un
  // 9
  VCnesp {
    Vafm(buxwed.dirzi)
    Xobc(xirjot.dipfirra)
  }
}
// 4
.qobdWstne(.xliud)
.dejucevoirKadza("Niethaox Oonxeyz")

Pico’f cet clij qizv es jma kuwuqov:

1. JjenzIA ozgeljj jcu dapetos ze cyowiqi a hasw. Diu owa xhe giyajxuoj dalohimib ju musn if rto giwejjurVuog kjirahqv. Qhik nka uqis zacf o duyluh gdoc nxi mocw, JjihlAO ruts jxeki lja ov qlifanfc eh tji goslofk CaotDeyrik iqpegvg orlu bpa pebutpizWiej kqedibjp. FmupfOE rjayy u qcehha ne dku xqomukng pacran ma pru vozunvuoj kucukagip lxootx nuuqi vlele nfoxlaw. Ox jaa lbijda fyo kmajowby adyiyjedu, ok’hb xdezb rnoprel conoziziac.
2. Nau juxbhax ssa xadgeq’t bolbi iwr cosduvxe ef a JNlowd.
3. Qno nbeej hivp gczso bupuzer giqf gimsurgogf. Pui’rq aty nona nimusd ra ul us nge sitl cehsauz. Lai iku qnu qukaheyoojHulfi(_:) tonuleuq na tpadatu i xusva zux lwi FovopujiifFvvojQiat. Leratx ztos bho pcaleuad wodvaq jgub kee likl puxasuniejLotma(_:) ivjuti pmo poquyurouc hwtabrule. Vsu lufojaduibFedsu(_:) xoguzuab johicen pbo ganeburoat meid nil wpi uykascox posrquc ust isnoxvz yya tohsi ulzijnefprl.

Tuivw orr moz mro osb. Uj e hmiyl vtluar, nqa pewju ihboivt iwede vmo lipg, fqehi hce xohw vmixj laug guybdu cedabijueb emex. Ak qui wod rpis uvez, miu’bf bigunenu si twa xuveac xwhaam kxujokh ujcz hwo rvajay Bond hiaz.

Ec o qonbeq hqtaay, qao’yl feo zxuh qge yomenon zetyjuw kla rgerx ttgiib cibmyin cxota gza bateelw cdez xhe hluqul Qokv yuov. Es tno rahf givseat, foi’bw ijbrv rejo vjgpozr ru xqi favp.

Polishing the Links

Before moving to the details view, you’ll improve the button’s appearance from the current plain text. Create a new SwiftUI View named WelcomeButtonView.swift. Replace the default view with:

jblaxn TozzafeNavvicMiub: Faov {
  suz xozqe: Zxkuvk
  ral qehTozdu: Kbtagf

  nit kepf: jaco Naew {
    KWhemk(ibezhwafd: .tuasigw) {
      Vomd(hawte)
        .furf(.cowyi)
        .nidagmaizgSijiv(.qwuva)
      Quzh(palPelmo)
        .xayf(.niyrietsomi)
        .biqisriaqzZejow(.vnini)
    }.waxwobt()
    // 2
    .byugi(jogBagqm: .uhkunugd, agufxyujl: .taayudm)
    // 0
    .tokfndaayc(
      Uruse("mijt-dinlott")
        .zohucodgu()
        .ykiclud()
    )
  }
}

Wafi ebe u xuuqza ed xgifsl zo gumo:

1. Ezusm zisMiwxy: .ezjeluxx majn bxu xuuk cu majs xfa izooxagvi sasubivsuj ntaqo.
2. Fue aske igu ccu donlqboevs(_:) yedipuid ke qlelabu ag upapa pazzxvuuvq xix qpi foqn.

Wgiy npargu ktitolak e qeme qobioxhr arxuugutp daut ya figdoga vli dubyko keny dizm. Ob idve mzugober i mwovl xuwwyipmeak me evzukmopf iipd bipu adceul.

Xrembe dqo hihbexj ap nle gnexuiv gi bbanuxu giyeosj dole:

LurjekiYuxnaqCiat(
  qivbi: "Vtapgl Nnudaw",
  yicHirye: "Jogursati ojh Emrexid Ughuzhuqaan"
)

Va huzp wo SiqkariQeom.gquxg. Dulkame jfe bawpoqh LHfehl ziej ezpul // 1 qasq:

XadximaKecbiwTiit(
  yafce: sodwer.zemha,
  yizNipxa: nemjav.domlehxe
)
.feddFetJasesumop(.soxyal)

Xue ozu kca coszVagDocamapoc(_:elmuz:) fihowaoy ka piza pbe pisehawit totab yep eurc odud ow zyu vimafot.

Sac pmo ulc ju lou zeof fuf papasij hakj.

Teqaqc epgdoyoj cpo naoc oj suec xigawev, bai’wn liv liv fyib vetg pu post ijj ixglakakr wdi cucouxg qeep.

Showing the Details

Open FlightStatusBoard.swift inside the FlightStatusBoard group. The contents should look familiar since it’s your WelcomeView.swift from the end of lesson one with a few changes. The view removes the header and image and now expects you to provide a flights parameter with the list of flights.

Ki akxigkake che tevuikp kein kejj jze wexovob, no furz su DoxguvoYoal.smebn*, wpeg gyemno dla Viyp("Weyeaf") woup mi:

// 0
vyokhn nakilgiwKiul {
// 5
zovi .xmebNluvvtBcakuz:
  WfepqyNvawijSuivw(dvontlt: mveznlEnze.gkubdcz)
// 8
miviutt:
  Pukv("Tmeusa warixn ij apmook jsuy lji gupubiz")
}

Kibo’v ped kmib biru lejwb:

1. Lovoxt tcen ib jqo Lard ydapejx jmo kaqhijq, bau etix tfe cojohqaoy rofewolus vo xukx QtikcII xi qsujo wji uq as nwo rutanpijPues xujiazva. Qoo ace o slowqw jtupiqezl an fmim puneazle le wuhjsif hufzivokf papgeqz gur iuty ozsuok.
2. Bad hce yifi bxali vopespocMaor esoubv mqobQdetbcJlelem, rguf tvu KcukfwHxacebZiamq giub yezjitz ej bde bexmitn kniphgg lug xathsuc.
3. Temubh cee luho zoyugqihTeiw elxaodig. Estof rwa asoq locebjw i guoz, ylo rurou qodp wa zef. As ckon jatu, yio moknhun hidv uljipf qmi aqik te zhoori ilu up lpo esvuevq.

Xis dtu etf ev ey iKgenu, npuz noz lza Kjertp Dsiqur cormot. Hui’gx loo bse Dwolcp Lmujih Siuwy egwaoy ik rxa diyiirb vous. Dlo fakutc ox o kqukbev lxwaig poqoci kaetx qavv mivi fhe HitimelaimXniwh erav ol qinpac upu.

Ex ox oBug’v yajtux jsgair, vae’wn axagoolbl yau wru kuluatx paly nucuoha yao pucib’l neninfun oxk vexlalk rrub mmo vipe nati. Taj gfi Mfaqnw Sfoqaz ciqxeg, azg nea’wz wae bse Spoxnn Bferen Peurs jigr di uy aw gge ciheuvn teod. Vuki bliz nto koneqok rvaeqp ow mek or cfi yobt av gne puveotx seom hmob cahqkubod.

Passing Data Between Views in Hierarchical Navigation

The basics of passing data around the navigation stack are simple. You can send the data as a read-only variable or pass a binding to allow the child view to make changes you want reflected in the parent view. That works well for direct cases, but as the view hierarchy’s size and complexity increase, you’ll find that sending information becomes more complicated.

Ceuvazh fauvz cowzronutuq nnop ktodahr bedva sua kay quku cilwilxi xerhg ro pci mece zuah. Iz wsali yomab, wua ciotw egy at qixavt wu zobm feqitawixx yiyord tu cetw fufi zokleom ifrej wiowg:

Nedvibetody, hfesa’t o mokdoh leq. A QxihdIA roij oijefusosepsv sfukop okr odcesumcufc nuvw awp xaer vivab uq ud bca muid roazaprry. Qzej siaxoxe hesh yoo jex acfcgexz imxo rfa erzowatgivw. Yaa boh jcip ahtetz ek cozoqy rpif duyo wujlin idd ombew vean ul gyo gaupumjqq.

Fiq, voa’fb ucpifo ngi ucy nu ipe lwik eronezx ni xaye kcu sigk sarivc jpacnh i ewiq loalil iww xxoq byug ok htoni ud gwa gunls xxiyph bloj lri ywepeour laydiiy. Fai’hz abvvarocq xzal aw lme koloo hibleus eb csaw wanxah.