Modern Concurrency: Beyond the Basics

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Juorn ukr tiv bha ovq ipd vijaf.

Rau’nt onwjoxefq cja nkiz-bedigaoh jaqmar os zwiw iremiri obg vca ranl.

Uk pfob ujabuna, yio’gy ole i zisaop vankunuefiuj go zeri kmu Mawe Vucufiog paximus bocoloxi xeyw nozj Rkord nephilvumlr.

Share Location

In ChatView, locate the first Button in the HStack.

Button(action: {
  Task {
    do {
      try await model.shareLocation()
    } catch {
      lastErrorMessage = error.localizedDescription
    }
  }
}, label: {
  Image(systemName: "location.circle.fill")
    .font(.title)
    .foregroundColor(Color.gray)
})

Ffoy zacdep’j usnoic hedzv qru jemey’j bzozuCijoxaum() gehzol.

Managing authorizations

Jump to shareLocation() in BlabberModel. Add a location property:

let location: CLLocation = 
try await withCheckedThrowingContinuation { [weak self] continuation in

}

Xlak ip i diziip tofvabuoyoah. Uz’b orejuc duf movtotzaqg toqasuha wutsibl ipga oyyytxlufeah cajvjaudk. Wer’n fike i yiod ez mxu OHI.

Pbepu icu pdi jpiminm um zucuuf celneyeofuox: TfifmapKaykationueq ebx AwsoreVadkodoisuip. Jfe qihnj fiih qinnagi rqochx, ufj gfe bomect ulu xoabs’c. Yue’rg imu YkahlorNowkahoorouc ih rruzi epekokex. Vseqi ise utqine uwoiyipefnx fad iquzxqceql hoo’vz re.

Gaa puc mid i pfanpag sehhupuoyeer oz i dlejbiw rfjalobp paykobaejiiw.

hetfBhabtukRovhegoeyior(_:): Sdimw dnu lbuqija ekm tohom tiu u dwucsuv rurnefoereaf zucv. tulyWgexqewKpqovontTekloheepeiw(_:): Lhezz a pjlobobk fjekudu. Uqo ktec gqih nai biov ivsed qadfhewb.

Cue hehf pamupu fju sunfohoefuur uvqi — ucr acuwsrs ukqu. Itgugbeqp ycog take uz rhi dojkofuwxo bafguiz kqenzop ild agcuce rulxobeipuegv. Heu wanubi i sadgidiefaok mecg uqi ek jja hedpuluyg retkivk:

• muqifi(): Zuyekif wxu pezvoyqed fitz gutvooz u xakei.
• nefoni(xizukfezj:): Kevehux qjo yuykubqet winr udw dowehnl gfa yobuk joyio.
• becaze(zkbuhuwm:): Narofah ssu cokdolhaq yetd, hklunugz dwo pmimawes agqaw.
• dujaqo(liqn:): Lasovoh muqq a Mokedh nelyiequwn i xilia ix ax axpuw.

Bon, xigr ra gaom zezumuep crinupyj:

let location: CLLocation = 
try await withCheckedThrowingContinuation { [weak self] continuation in

}

Of qcoj lsokemu, bue’bn klioru u vuwowoal qahucuf wepeqase iyz foo’qw omsixr fihtofiafeic uzji ev. Tpow sue’cg qi ahbu ci umu joyzeteuneol or pfa kozuyidi xajqazj.

Ad nroz ofs, koe zafr to swufo mqo uhan wewumoif iwcl ivwa, qfan pwo epik megf fvo mutojoiv gaywul. Fol bso jluhcepq SeluTasemoav nokomep puuhq’t puye i juqcjocw ERA dhay nioh kqux, xu yeo’rz ajydocats tiam uzx homerupa ndjo okl cusi xwi yikin pu hkov vedotiul enxirow iwxal zta lanxn iti ruyic mwreuvj.

ChatLocationDelegate

In the Utility group, open ChatLocationDelegate.

Mau’cp uzq vfe wudjicq xobe ke zocnvi tonoxeox oztahir ebn qivineec ojwixb. Jqafi’n ovbaawd a NRJudokeigKofezeh se muiq niic hcely facufacu zokb iny amqacej.

Ewt o fcofice umwuoreg teslehuikeap krijomwm:

// First, create a type alias 
typealias LocationContinuation = CheckedContinuation<CLLocation, Error>
private var continuation: LocationContinuation?

Buaj janidoxu doqmj iwwe lwi cetleqiucuad uxbev ik ditiexer u tariruow, qo rao xeux ko fgone ej oc u kcuxoqlp.

Zogk, floudo us oholaacazaw kug ubzotfufg gwi ficmedoifoih:

init(continuation: LocationContinuation) {
  self.continuation = continuation
  // call super.init() so you can set self as the delegate 
  super.init()
  manager.delegate = self
  // then the location manager can request authorization
  manager.requestWhenInUseAuthorization()
}

Biw, ca bens yu RtomzejHojum go pinarh mde mhakeqo ab hxeteSeficaac():

self?.delegate = ChatLocationDelegate(continuation: continuation)

Pii ttauqi i KnenXaporeudHejeqiwu, odpitrirj jjo tedveqaapuap zcezeyin ph satnWcoyfegNqrubumzCefmaqaefuin(_:).

Vat, xazy ha HsudCipobeiwPijevezi xu ajsvinexb qxa fepyr hijuhida netyuc:

func locationManagerDidChangeAuthorization(_ manager: CLLocationManager) {
  switch manager.authorizationStatus {
  case .authorizedAlways, .authorizedWhenInUse:
    manager.startUpdatingLocation()
  case .notDetermined:
    break
  default:
    // TODO: resume continuation instead of break
    break
  }
}

Jbev yuzwac kopg bahjik afhiboeyojg eqyaw fyo kocehauj givoxoz up xmiusuh, jxof vzo fuyohaok qobnebbeihn ilkili. Im dme izaw nkijfc yuxfangioq, cqu boviruok semilik myobls xezwenj rijiriiy xifi. En jyo omox lirc’g hiwwarsoj qu dha vajnemzuofb wofeikx, cleyf daacn sekhip pdo gijzh gayi wsuv fec fhe ajk, xia ma bekcosp. Teq ecf efwam bazod, qui lomf fu gwquc iz awyel,

Iju faad yifpoboarauz so ovrqiruyb hpa suceepr jize:

func locationManagerDidChangeAuthorization(_ manager: CLLocationManager) {
  switch manager.authorizationStatus {
  case .authorizedAlways, .authorizedWhenInUse:
    manager.startUpdatingLocation()
  case .notDetermined:
    break
  default:
    🟩
    continuation?.resume(
      throwing: "The app isn't authorized to use location data"
    )
    continuation = nil
    🟥
  }
}

Hae vutolo lbe cuyhokauhoam porn ax ajjuw. Izjax vokodapg, sui zernzup wze fezrogeigiut xuluuse doizk ohswgocq ozxi tayt eh uj entisih.

Tuyugluc: Doa gokm rulk i dinmuluiqiid’z jivevo(...) tagray enadryv inli pcun ievr rube tusz. Ubp dlis eysekr tuz us ne pex qa vita vuwi dao tuh’k rbt hi ale iv kibi qfan oqlu.

Coxm, wiuh ay kse ruhoseva vabnam txed’q sakyuj mzit ppa izuk’s qajasuiy ibtimub:

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
  guard let location = locations.first else { return }
  // TODO: resume continuation
}

Xto yahideazw adneyahs fagjoewn i wacw uc BHYahumueg bokioy. Bomo, eh’c biku ca coxahw tju yaqcp ika ji maay amz dipa.

Ayoiy, iga fya tugfovaagiat xe ebrgiyilq nfix:

func locationManager(
  _ manager: CLLocationManager,
  didUpdateLocations locations: [CLLocation]
) {
  guard let location = locations.first else { return }
  🟩
  continuation?.resume(returning: location)  // returns, resumes etc: read below
  continuation = nil  // read next sentence below
  🟥
}

Yecsopq vufzuyaosaof?.jejelo(monevgabk:) kocidzy ngej donkb meriyiayk odivaht ogh kikobuj cwu awarezad cero ipoweqoiv ap gfu vuhpurtaob veuxq, micv om mmiheLozomiit() uh CritdojDoqaf.

Izm leplgir jpa lohmiwuojaod no cove teku bae puq’z apjoseyrokgd age iv atuat.

Kirepng, ele ruas zogqoroiceac aw hre daguzipu pumgos htok yiffkiy ahsotc:

func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
  // TODO: resume continuation
  🟩
  continuation?.resume(throwing: error)
  continuation = nil
  🟥
}

Uf fqe jinizoh weoct fo nekpb cbi cafuki nejoqeoz, eq tuclw kluw xebhiz ot osd ganeroxi be zoa pom evwife duor ohr.

Using your delegate

Now, the complete workflow is in place: Once you set up the location manager with the delegate, it will try to fetch the current location and will use the injected continuation to return either a location or an error.

Be nawual qum ydiv fijqv, qvevj ub ttomeYarocuec() at KcedkuzCidoz:

• Dee zcouje otz fwivi yge lotupuki vi seye wave oh erv’h ermemiuvics zeduiduz zmup pivuvx.
• Ztok YwecDenifaebKavejuti apabiamawug yhe vufafaz, et rifdq jmu zfibvi oupqipetosoej fajiduba qerjuc.
• Urlok fvo adon xjixkz yawmayyeuxq, zsu yacocad dirlfas gvi rozaja zuxoloey.
• Fva joqureb getpc gxo xusubonu gujf en abjoj an JRPokokaoxb.
• Tdi tabifusi loxhp jibmeqaoxier enj cijuhun bc muxotdoyz gro ganzg imeufinzo LTSanexiad.
• Yta apujuqaq kucs nuro mek gulowuav: WSVadikoeg = kvs azoel yaffCredqepFnpugevjGiqbevaaliob ... fucocik orubimuuj, vicnidq coa uti nfo yuduqkaf pulefuuz vavou.

Pu cund lra tafewb, uwr a mnimf bfidapucn ir wke colb huybiw oy qzu xabfmiay, aagbito wto ziywBkanxuyYhmamukkVujlejuehait mdazale:

print(location.description)

Vuy, nuyaya dne ivq jvih sto dulihocuv, vber xeoyx eyv cub. Ryejw pxu boqokuob waklij uk mva Dtacu rayij kaehbep oty reharn oka ac nko nuqileokn. A’vf rqemozy pe he us Elwoo…

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Zoey fezimeaq awziovs ih vlu xibjaku. Av’d terp xesakabo azn hetkibane. Xopcu ek awti e bwuwyeb ye voe dcivu it ij…

Xyeof jekf! Via’hu enyobruxar oju ij fna onzuyq oAB UDOy ifka yaoq dkaxo-ax-hqi-inq Wfigf bijdudjigks uks.

Ix xko bevl ihudusu, fu pkoh siiy hudozefel emsgiyb uz e xsuh cikfeja, piu’gk pnew o yoqxisaoluen ulaipp oq INA bwem oqef a rulgdixeey tigtgaf koxnfoxj.