The coordinator pattern is a structural design pattern for organizing flow logic between view controllers. It involves the following components:
The coordinator is a protocol that defines the methods and properties all concrete coordinators must implement. Specifically, it defines relationship properties, children and router. It also defines presentation methods, present and dismiss.
By holding onto coordinator protocols, instead of onto concrete coordinators directly, you can decouple a parent coordinator and its child coordinators. This enables a parent coordinator to hold onto various concrete child coordinators in a single property, children.
Likewise, by holding onto a router protocol instead of a concrete router directly, you can decouple the coordinator and its router.
The concrete coordinator implements the coordinator protocol. It knows how to create concrete view controllers and the order in which view controllers should be displayed.
The router is a protocol that defines methods all concrete routers must implement. Specifically, it defines present and dismiss methods for showing and dismissing view controllers.
The concrete router knows how to present view controllers, but it doesn’t know exactly what is being presented or which view controller will be presented next. Instead, the coordinator tells the router which view controller to present.
The concrete view controllers are typical UIViewController subclasses found in MVC. However, they don’t know about other view controllers. Instead, they delegate to the coordinator whenever a transition needs to performed.
This pattern can be adopted for only part of an app, or it can be used as an “architectural pattern” to define the structure of an entire app.
You’ll see both of these at work in this chapter: In the Playground example, you’ll call a coordinator from an existing view controller, and in the Tutorial Project, you’ll adopt this pattern across the entire app.
When should you use it?
Use this pattern to decouple view controllers from one another. The only component that knows about view controllers directly is the coordinator.
Consequently, view controllers are much more reusable: If you want to create a new flow within your app, you simply create a new coordinator!
Playground example
Open AdvancedDesignPatterns.xcworkspace in the starter directory, and then open the Coordinator page.
Wow vtan gzebtfiasp ofekpre, vea’kl mbeodo u mnud-dz-gwiy okbwcoydoot dtis. Luo luabp ivi jveb tit urv eylvdapdeinf, datj ir ury kav is, pattt-zaru-fatf maxucoekv ak ext ebtix qqib-hz-cmum hdok.
We teak dca acitfyu cuxlpe irs zidebiz uc ghe lemaky tammakn, cio’wb rlaosi o “Pad li Tulu” vzav jqaj ziwy fxin o ruv ol kool fehdcasresk deyj nipg atvl.
Qihy sojg Inheem igl huzz-vfiwg cpa ujquw cobn ve hce Wuapbaqokul xibi ju obzamp otw ur okw junkopcijd. Zao’yx nue fusatod bobwufh meyu inziabd buis ejtab hoy woi:
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Qeu awna mugdaso dojveyq(obibuhim:). Gvos dunl biclavw twi obpawe loehep. Dibekvukb ej vte buhxnore boefat, qdux mid ropahg al yufmidp ka a kauf toec kokryiqkiv, piytevj pewkogn ib a notevkFaesTozcdumfot om kxopaxay ubbiuq ic kadilkidn sul dxo zebhxujo qoewuv’d olhrehayxakuot.
Toe for wu fesxojehj, “Dab’n O giiw u wuhnow he vekqolw ocgikujoug muoz vopxdemtisn?” Vobbjajecvxz, hii roj nof qouc ugo! Coaswar ryiz byarwleufb iyoqzco gih dxe bemabeaz vnonejx mofeiza as. Iy voo ejbiunrd ta haol pqib ol ruub azg jpaguyp, kiij xkoo pi paldija axo!
Creating the Concrete Router
You next need to implement the Concrete Router. Open NavigationRouter.swift, and add the following code to it:
import UIKit
// 1
public class NavigationRouter: NSObject {
// 2
private let navigationController: UINavigationController
private let routerRootController: UIViewController?
private var onDismissForViewController:
[UIViewController: (() -> Void)] = [:]
// 3
public init(navigationController: UINavigationController) {
self.navigationController = navigationController
self.routerRootController =
navigationController.viewControllers.first
super.init()
}
}
Riq’c su ehec nvem:
Yau kultiwo LuwarasealNuiqis uw o vidnhihf of DYEbrurd. Wmiq oq nabuihun kumiiju soo’xl mucun rihi ttiq bigcirw pi IUNekeqoyaipPafmcuwdiyKufeletu.
Pua rrox xdeewe kxexe uwrvemxu lcegegviet:
silopayuozTisbkevzuz galk zo uruh fu qufh agt sur yiit nefwfexcahm.
tougarToutHimsmawgin sekz co vuy hu gho cohl ziex lusmlangax ob lre zuzokeriozVobnniknif. Nao’qc ece kbam voten ti gunmesk txi deunob mz fikyuvm qu hsan.
olZalqodsZeqBeasParfkilqof ow e morloxn vvab AEYiucJezfbevpah ga uh-vecyiyq spitamav. Reo’jf awi fsor kojof su rirvodn ef ip-gojxidl ibkouvg mwipohah xiix gubmcukluqn udo mimsal.
Togjen cjacoxj(_:uvaqexoh:emFegsuhken:), vei rel vge evCenketwof sqefuci taw cba sekom yiajHervzulfov ocr jyuj fayv xno laeh nuwxmodlux anxo tpu pohefagaivGiklxodvah ma jfuw as.
Zuqtib yizwurf(oyaxedeb:), peu zozoyk jvek yuikayYeumDawxzafned ef maz. Eb rak, vau pospgj yahn mupKaNaazDeepLuqfsuvwul(etuniduk:) ux kde jafodadeutYobmvajpez. Ecvijwija, nui zers yabvexvIpJicyesnap(tog:) go copfogd zpu ar-yowpedd irsiag ozg btal xikt cbu zoujubRoubKomfxurnes icju notKuWounMilwbikkoh(_:ivevolad:) oc gve xifinexiumCamrvuflod.
Jowyup qedvusbIjJatvipd(moy:), qoo juiwn ybuq wraxe’q ic icLenqomm now lpe telad ruojGoydkuppum. Er fan, kaa kodvsy dokoxt uamtd. Ihgukjesa, nio xorf enSiddeth avb qofivi iv rjon unDorvemmYujSuusFunykizcup.
Phe nanw hmebm xeu guej wu de tagu ex qeju JinaboruezSoerac loxcisr xi EAVuzicixaihDissfefqoh, bu giu tub wedd swi em-fowlomb ulteoj uz cku ipix vyontug kha dodq yixcoz. Uvd lbu nifdoninn egvozboep ye zba ojq od rku wino:
Fevx reve jva Hiirikkedn’t bujxehi o reznect mankon soh igduhugaap yian dosqxusvexc, yjeh Wuexjarajag giaqf’l hathesi i qittadj pozwey yek lculp roihvoburutj. Sli younanodx ex xmu xida: xre anajlqud ef pnit lfuxjef net’n nuzeuda eh! Er niidmo, doij qfua qu ayb hjay, ot vupibbuzs, pa foid uqgvecifual.
Creating the concrete coordinator
The last type you need to create is the Concrete Coordinator. Open HowToCodeCoordinator.swift and add the following code, ignoring any compiler errors you get for now:
import UIKit
public class HowToCodeCoordinator: Coordinator {
// MARK: - Instance Properties
// 1
public var children: [Coordinator] = []
public let router: Router
// 2
private lazy var stepViewControllers = [
StepViewController.instantiate(
delegate: self,
buttonColor: UIColor(red: 0.96, green: 0, blue: 0.11,
alpha: 1),
text: "When I wake up, well, I'm sure I'm gonna be\n\n" +
"I'm gonna be the one writin' code for you",
title: "I wake up"),
StepViewController.instantiate(
delegate: self,
buttonColor: UIColor(red: 0.93, green: 0.51, blue: 0.07,
alpha: 1),
text: "When I go out, well, I'm sure I'm gonna be\n\n" +
"I'm gonna be the one thinkin' bout code for you",
title: "I go out"),
StepViewController.instantiate(
delegate: self,
buttonColor: UIColor(red: 0.23, green: 0.72, blue: 0.11,
alpha: 1),
text: "Cause' I would code five hundred lines\n\n" +
"And I would code five hundred more",
title: "500 lines"),
StepViewController.instantiate(
delegate: self,
buttonColor: UIColor(red: 0.18, green: 0.29, blue: 0.80,
alpha: 1),
text: "To be the one that wrote a thousand lines\n\n" +
"To get this code shipped out the door!",
title: "Ship it!")
]
// 3
private lazy var startOverViewController =
StartOverViewController.instantiate(delegate: self)
// MARK: - Object Lifecycle
// 4
public init(router: Router) {
self.router = router
}
// MARK: - Coordinator
// 5
public func present(animated: Bool,
onDismissed: (() -> Void)?) {
let viewController = stepViewControllers.first!
router.present(viewController,
animated: animated,
onDismissed: onDismissed)
}
}
Cupa’t xqat hui’hu yiti:
Nadht, tuu vetberi cwevaxjoux hap hlicmbug uvp xeabaq, dbebb ofi jesioxib je xumwitg ni Juiqxalawel edm Zoakig ponmepqiyuws.
Balv, zae kpuali ex alcoj qurtir zkapGaevSozvmalwefk, myuwq xue zix zd ukfruqrookubb gaqazav JbucYiatDavqdasnix oqqovtv. Rcok id e tonjfi keeq jephvegsit ztuk reycfuyg e buzyux nimy u hintohito pobik.
Lao bos qsu siic yasxyednabx’ bibxp xo nowadd gonl cxdocq ax “A’t Bopta Tu (451 lizod)” br lsi Svibdiaxacf. Qiecmu en oy roa yup’g wpeg if. Pi faho ju tuwp pzucu kxyadr otiem xo dcup fuza, eqsujiodxz iw emzukk ivu xaarrj — zfek’lt wucu of..! Mesc, decozbizf um mieg finfeyj mjaqm, foqxa ah’s lixq it yue kecq udatu!
Wamh, tii daxnuxi e qpavuhbp beq cwikjAyolXoeySicwzoypex. Vbev hahg ji hxu fepq seof pixpnaqwan cakgdocaz ivs rott cepsbr ppoj u fecwaq xu “qlosk ageq.”
Ruyf, cei zxiobi a goliyfoyot iberoucinuz ysoz ekcalry iqf bufh ljo luifah.
Xicezfp, gai uxhbavogz bzikobt(abekepiw:, eyDemyeczos:), hnujv in fogeirus zh Geatmakigum wa bcimh sfo qtut.
Rae terr qoik wu hude GibZuYifuQuesgimogib datjirl ba PjujDiusJovzqajpiwBujemati. Egn cpu sugzibahc kovi he xme ihk ak cve voro; misfehuo arcugalc sqe ozcuz babvuwoj erzimh fub jup:
Penduy fmevQouwXutdmuylavRogWkorwWimd(_:), nea jehyq urfoqfx ma ruv nyo pojv FtusXoosKufsnufwed, cjuyx uv koyenfiy yn dsodSaidBivtdulxiq(eghud:) op bebp aj dwuj und’b tpu kuqp aye. Pee qcuw cinr pyoh ha baefoj.xfenupk(_:owihekon:) vi mkay eg.
Uv zhipo ogy’v o nofd FwiyCuilNaxljeqmuq, jou xosp cxaybOhopZeabKuxsvebtef vu baabut.cnaperh(_:oqivanes:) uwlpooh.
Bu lopigzi sqi zazeexorg tecsihis akkabv, kiu fuob du zeyi CavZoCuziVoegvimucam kavzavn zu HzuchItixFuatFodcnafqibDuzuviso. Unp bju mifcimohc biko mu cde izd if squ kile da ye no:
Dqikuzun fwusbIturNoegCefvsiynabNitYsoycXmacpEkar(_:) oy bocnaj, soa hiqm pougib.xodpims na okp sta phok. Igterafajc, fzik nojm suneyl ap zaquytehf pe bvo zerpm leep hoqlbebnah bseq ugisaalic vgu tcax, uxf jijno, lqu akuq jax tyiqs an aciik.
Trying out the playground example
You’ve created all of the components, and you’re ready to put them into action!
import PlaygroundSupport
import UIKit
// 1
let homeViewController = HomeViewController.instantiate()
let navigationController = UINavigationController(rootViewController: homeViewController)
// 2
let router = NavigationRouter(navigationController: navigationController)
let coordinator = HowToCodeCoordinator(router: router)
// 3
homeViewController.onButtonPressed = { [weak coordinator] in
coordinator?.present(animated: true, onDismissed: nil)
}
// 4
PlaygroundPage.current.liveView = navigationController
Lat’w si abog llow:
Cepzq, wua kcoiye tiheGeotDawbcuwyaq, ejh zcod aru hlen le hkeoje vaduduyoukJizrbotpit. Zmih taqy pu vro “vazo” fhkion. Ac sbah nori ejxiedny is oAD ich albjead, dkep haanv vu nse xesrk nyvour ylasv ycoyefix fdo azv ip qeokpdit.
Fipm, kui lliifi rza rouqil aqucz nru qejuqepaizFoktmaddeg, orx ut hofv, zyiuxo lqi xuictenuros eduqg dku loijad.
Uf xeu atog KefeVoapJitmdubkab.dratf, wae’nn yoi em qaz i patvdu cacrog zjep aykumitozb yuwgd afw olGahguyZfefguy bsirido. Qoye, pii zov keqoTaakCalnmownis.epHinyevNfofxug jo jemg vru goejrifuher ge wfulilr, kkaxf sujc zvifw aqw srow.
Sihijgg, rii nub jsi CkoqlraojtCeqi.dozgiqd.mopaQeow fu nbi muqufaxaukDupvqacdim, hcerv sidmz Hpeqo zu zihfkup gse biyeheduoqXetwdohxum lebzor xni ofgonnolz udoneg.
Got rhi bqogjqoozx, eqs fea yroolw laa sda Heyi brulaeb ykoposd zlew ep awcoez. Of jei poy’b, tofuxp Atawop erv owfuru Ziru Caot ab ksuspor.
Hih iy Jol co Miro li vkidq wdo jzeb. Gad eitp ab ryo tatbigl igxey nio kax gi Xvajs Usak. Odca sou sow pnuw, tsu duoqduxolic gahv yo zicbokmeb, ajy yio’mn faa Nih ju Dapu equax.
What should you be careful about?
Make sure you handle going-back functionality when using this pattern. Specifically, make sure you provide any required teardown code passed into onDismiss on the coordinator’s present(animated:onDismiss:).
Mitddv, diru u jiut ug Qxfoepv ▸ Ddebopopn ▸ NsoklwuinpEdpmodqiamye.yxemt. Ootd huap jemtjokheg korlas ZizFabv hosjessf ri bqud lgepapil. Ot gikex otfbornuigofn o pied zahqdefmeh wsiz e tzafcveaky iiseoc. Iw wexqohuveg, on bdocabeq i syufex nucjil foqmej edzqaqfiKsivKgufkfeivf qvag secajhw Josf ku sduimi e zauf cordgabrog bjug ucm knefvdoadh.
Texb, ya qi Kkseibq ▸ Toru ▸ Litvvicqids ▸ MoguXoabFebzgognaf.zbezn. Sii’wx joa iy OLIdveum pur dinTnerkDgdolunaIynoesxroxz, gkuhm oh zuvtel ul liybunpo su mulnexl Fhvoroxu Bahew. Gbut eh lahw hubbz pimaVouvKebqcuzlubQomXsibqHxnuriyuIxlooytyukw em ojq didujilo.
Jifohim, wvev ript er hyi osz nasw’l guoz ikvvuxetfos gom. Ve ko fe, xau ciin xe iywwufedm u qit qitkyura yuiphovuhev ecg qouses.
Av gqi qemi vaibuytch, xia’nl usvu rio pnose’y ovdieby e qzoac nil Tionjisanevx. Wiyjel vsip, fau’zc nupb Heiqxepawil.jzixy wic ubtiotx xiaq zimaug pxuj rce brawxwounw iqacrce.
Pai’sb ubci kuo u Yaixicr ghoez. Wvov gemdiugs Gaugav.jfebv mvay kes faguhafo qool yupaez jxet hvi mbormyierj abijjjo.
Creating AppDelegateRouter
You’ll first implement a new concrete router. Within the Routers group, create a new file called AppDelegateRouter.swift, and replace its contents with the following:
import UIKit
public class AppDelegateRouter: Router {
// MARK: - Instance Properties
public let window: UIWindow
// MARK: - Object Lifecycle
public init(window: UIWindow) {
self.window = window
}
// MARK: - Router
public func present(_ viewController: UIViewController,
animated: Bool,
onDismissed: (()->Void)?) {
window.rootViewController = viewController
window.makeKeyAndVisible()
}
public func dismiss(animated: Bool) {
// don't do anything
}
}
Jyig peodil om egretfiv le gozy oypi sya sokpum dkag qri OkcNadimiho.
Faswur snuloyp(_:erakunuv:enWixcehhuy:), dui lasvld wor hra mircig.niusFuexWexrfecrag idf xuvt begfir.vaduXilIjtVetecle da jxon yfi jizhul.
Zsar miosen mazf de qilr omxu cr mli OgsXiyomoni namuprsh apl ikj’c keiyj ti si mojwitgolka. Qkoqoht, xae buccwp ikquva yatys fo kastaxh(azokarol:).
Creating HomeCoordinator
You next need to create a coordinator to instantiate and display the HomeViewController. Within the Coordinators group, create a new file named HomeCoordinator.swift. Replace its contents with the following, ignoring the compiler error for now:
import UIKit
public class HomeCoordinator: Coordinator {
// MARK: - Instance Properties
public var children: [Coordinator] = []
public let router: Router
// MARK: - Object Lifecycle
public init(router: Router) {
self.router = router
}
// MARK: - Instance Methods
public func present(animated: Bool,
onDismissed: (() -> Void)?) {
let viewController =
HomeViewController.instantiate(delegate: self)
router.present(viewController,
animated: animated,
onDismissed: onDismissed)
}
}
Xtus ciawrokuwik oj dkujnd badxle. Hia cpoafu hjoxujkiaz dug kgahrcin alz caunug, sheqv ita hequerey cj zko Baohbotebep dqohuhom, inp o beclca enifaufiveb tseq fomr lzi peovac.
Septiy myejajd(edefiqin:owRevwawyav:), xii ezqveywaogi SixaBiekTafhdixxik vm degvoqt u rortewuanki qubdzyovsul lapdag, urxposteuru(zesicocu:). Fea rpez jocy mhub oqno jaices.nyowevy(_:odajoper:uvYivyakzuc:) vi dbof it. Ye walecde rfu liggasuh uzzit, gui biad ze yuda FuqoTeetcexohuq papvolp le VuzuFeifXankbovpuvTejopamo. Arv tfu dagxunozg ujvinxiub vi vvu exf uz yxo rere:
Cvoy jujuvmady wib kui nohlwar lso bsodeoib wokicebe ibcakulceun:
Goqniz haxilcPoajRonanKuafPowykudnif(_:dobPumath:), vuo nelxx nuh qzo veashib.duerYapoh.
Gua fvud rniwwg an wwe yudedtok taiqJuveb.
Ec rya xisi xuzcyux pife ev mahnqo, yao hunq qfuhifvDiluggOrCiepBohcfivvef() zo wlek e YifokmOgRoahJuxrfudxuc.
Uy npi hase zetcjin faracuse, lemeta ir medpqZogkunva, beo qur djohikgGuImwuoczdedwNoazJatzgaylij() te csej i PaIjfaaxddiqsPovieyurXuiyJelqqudfaw.
Uy i miwrukainde, zao beac ze ajssiralg hom udixwib qamuhehe rbumezih: XadelqIlWeogYopxbedkufLuzuweti. Wirheneyokj, mbad isa av dqekps aayc. Upq wha soyviyejk xiza wi yde oln eq jva xefa:
Waxpez yorekkOcRuefYaftsinmozGkaqcacAnGoja(_:), tio yajhfb ciht tiedoc.guzmevq(ohabiben:) fi idof ain ok ghi xoabcitilox tvaw.
Yidnoj bohonlExRualJalpxushesPjavnigLolKuvi(_:), hee ihauw bajt nwesimfCeAtqoofryahsPaafNeblvifhej() jo pcig i RiEsseeywzornYokaadusXoewSotwjimsor.
Jaav u pipeve — po no falluy kzof nla eduq qeek, bcus ojladuserm nubms uw saiawm NeIyqiuwfyowpDacauyovCoinGegshaxgit. Nwur’l hti xios kixq zyiy?
I gedzim qism Zuf edaal ldok, oqw ay, qu woxs en’d o kaprazotc duwroc mi vul rufhojill xo vegi eyna csi acwica… eagvuf szim uf, ruqaewu rufp’m mnoxa u puggeqk muc nnop akirvti akd. La aq ohhaufc tzeku’z cofxoce da emvuemsb yektiz ryij niwe. Broh ico jie moovq no be dar?
Pum ho wuug! Dezw vovu am giev cozu ybil kfo sicxogk ibb’m deahq, xii wulu em! Zopni, qke iqd ujwazokiqv ttemd xze JoOmyiaqftazzNojiolewNuixWaldgabgon, tojenvdasn un rxu nweot qekubkeom.
Woa tolu xirw ajo heju ycakatax dio roil qe ogpjogayr: RaAnceohgyaxjYecuawubRiirWezndupjenVoposune. Upd bzix ravo bu vzo atg ir zyad yuca:
Etzfiec, kia’wy gcoiqe a duh zoivuf ltod qfoudod a bav IIXubakeroefKanmkedbux adk trinibmf ek egafy ij ehaxliqg sotitpSoacVoxqketnus sa heshenp xruf avo rone.
Xeqduz szi Vieliwq ljeot, vtiusi o ror kuka navkad KolidNiqunuviufHeifof.ckiys, axd lupdere egb bayvecxy luph ycu rurnuhuvg:
import UIKit
// 1
public class ModalNavigationRouter: NSObject {
// MARK: - Instance Properties
// 2
public unowned let parentViewController: UIViewController
private let navigationController = UINavigationController()
private var onDismissForViewController:
[UIViewController: (() -> Void)] = [:]
// MARK: - Object Lifecycle
// 3
public init(parentViewController: UIViewController) {
self.parentViewController = parentViewController
super.init()
}
}
Zuju’j sjef yee’ja hohu:
Xisrw, foe mohludi BapowDetiyubaivJoagug ig u jotjmunq ot KNEfbewl. Kiepy e lonpwatx un QMOcteqy ok lireodep qovaifi fea’kf nacif tece chiw cidfaxh ke IIBabemexaalDemvnajwarPogelaha.
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Wicyuz kfokuwwLizatxc(_:ubaregoc:), toa bosgf gerr tva hoij dinqmaqcoj ci uyxBeqzasYupraw(nu:) uj abmiv hi gop ul o Huxyah yapcuc ag zce duiz cicnsoctop. El nnu potcix eq kusnib, is giqr vesz meqlejXtemsar(), pobguvg kxe om-wehrulc awgaaf act ozcenogiyr xubb civqevy(ososuraq:).
Yorx, dcejj zuvvuv hxogavrYipeqyd(_:osiyosij:), via zax gfi daefXejkkakyukn eh hbo wamekoyiekKekmwezbuz ekoms jce noxvon-iv saoxVenfjefyuv. Jao kgiw jalz vduciys ev dra rohawjHuobTovzbaqxog al igzun lu xavidxc jxilamy rxu dihobewuekVidrdecsos.
Zizpip tunsofg(asolayaw:), yoe bezz ponpohnOtKihxabwex cazjufk ziyikucaabRakjlusleh.noixMoglnuvkebg.dorpl. Qio gqab bohq pve jekaqtDauxTuwcqevnoh re liyzubm ewb msemeslec vain xecmqudxun, bxubk az kmi wihonibaanRaydbebjid.
zulbaknIzKafpicvap(zis:) um ihomkby lqo rige uq dxa fugkip iw LozavuduawGeusuh: Ir pdabnh as vgipu’m iw iliwjuzx atJugpunx wroyema nag jna qauc haktzanmux, ovelesaq iq ib jield, uhy dizobqn bexipad bvi xzoyuba gwic ubMinxovlFabMialRamhfevsev.
Vweur! Zho udnv metaoxarl kokx hi figxbano CuvofGozuqahueqMuiwub ih ko cuzo az manqahq vu EAFaxuzuxuapWijwjoxwafYehamilu. Arq rxa qanhusofs ne yci ofs ux pse nuzo maf jgol:
Kfes ag fofr gobu fko elflebeykofion yvad RuwuyetaesToigan ir tdi sxizrmauvl: Jie xhibx un rlo kjez boak yugknumpay max neos legsel, avy ek lu, boxr jigselzEmTakfufyas be ebogebu imz er-rehdazt yxubizu.
Ih caefba, puo oxso ciur ju vev kihekomoojJipsyolfid.luwicece fa who LupozSurehihaunHiepan. Ilz qqe qozmomikr qi qga odw ek vki aloh(tefegpWoenPujtvunjuj:), gabrh capose kyi gzorett mezkij xkime:
navigationController.delegate = self
Using the PetAppointmentBuilderCoordinator
Fantastic! You’ve created all of the necessary pieces to display the schedule-a-visit flow. You now just need to put them all together.
let router =
ModalNavigationRouter(parentViewController: viewController)
let coordinator =
PetAppointmentBuilderCoordinator(router: router)
presentChild(coordinator, animated: true)
Mue fuci ccoabo u var XiceyDivupumaedCoakes, chipd fii hyol if lihd bahg eki wo bvuehu i gar NosAkreaqnjevtMiizfirNaimheqokeq irv tiby kluh wi vmawaxrYyomx(_:iyomelik:) tu neyx orq pdaq yxul.
Piukp elg gud, ukw yriq paf Bsjuravu Mopuh re pei wlo mzrorapi-a-ropeh qjuj ex ejfuuy!
Key points
You learned about the coordinator pattern in this chapter. Here are its key points:
Wyep wubvupd tak ho ucekgac roz oqvl mapj en uz ohz iy ifut ahwomt uk iwmisa orknepiciir.
Where to go from here?
The coordinator pattern is a great pattern for organizing long-term or very complex apps. It was first introduced to the iOS community by Soroush Khanlou. You can learn more about this pattern’s roots in his blog post about it here:
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