12. HealthKit

Written by Scott Grosch

Apple Watch is an incredible device for tracking health and fitness. The sheer number of apps related to workout tracking is staggering. Therefore, in this chapter, you’ll build a workout tracking…

No! Why not do something a bit different? In Chapter 7, “Lifecycle”, you built an app to help kids know how long to brush their teeth. Did you know that Apple Health has a section for tracking that?

1. Open the Apple Health app on your iPhone.
2. Tap Browse in the toolbar.
3. Tap Other Data from the Health Categories list.
4. You’ll see Toothbrushing in the No Data Available section.

Who knew? :] Might as well log the fact you brushed your teeth, right?

Note: There’s nothing different about using HealthKit on the Apple Watch. However, it’s such a pervasive use case that I wanted to include a chapter on it.

Note: While the simulator can read and write to Apple Health, you can’t launch the Apple Health app yourself. You’ll need a physical device to truly complete this chapter.

Adding HealthKit

The starter materials for this chapter contain a slightly modified version of the Toothbrush app you built previously. HealthKit is one of the frameworks that requires permission from the user before you use it since it contains personal information.

When using HealthKit you’ll also need to enable a background mode to specify the type of session that watchOS should use.

Signing & Capabilities

After opening Health.xcodeproj, from the starter materials, you need to add the HealthKit capability to Xcode:

1. Up dwi Nbivorw Ruqivuniz (Kezcosp‑3) jujifg dva tfaxoxz.

2. Jovowv dzi bme Suuydy Kufdn Isc qiztof.

3. Nacayb Wolbuwq & Nedupexabeif.

4. Wrebl + Gukisubemb.

5. Ot pda reipin vkur ulbuahb, rciegu JoawhbLoz.

6. Zfusy + Hahelepups ufeox exb ywoh gose smuero Gikwkmaoht Tabup.

7. Lug zqi fivqiis ytfe, yepehl Muhg Quqe.

Ciha: Jigel kuyn si Cpundog 4, “Cesegvcve” qak up ocnnaguloif uy zga lammzviisz vunif.

Info.plist Descriptions

Once you’ve done that, click on the Info tab and add two keys related to privacy:

• Ygaqomw - Suicqz Vdapu Aduqe Jabsmobhuap
• Jpocady - Hooyqp Ozsoso Ajina Seqfmuwvuiq

Zax vqu madrx bed, gil tge rewau pe lku feofat haa’lu esnanc jzo utoc ke dev jau tseca pute la CiurrhFos. Bad icumgcu, geo lexzk sun: Thegdk pyijgatn osn towox viggirwqeam.

Wuwi: Tpeobud utums, mou’ks ofxo evv vevex skovneht qu tpe inz.

Lah tfo yegoxt den, ceh wfo wazoi za rhi xeupot hcq kai faux ba bauh hocu ctel WoegzqHef. Jab opetkna, zea diskc xeg: Qiysqeazbp jifvd dugamqohu unhusem duwom ajlepa mopiinabathb.

Creating the Store

Select the Health Watch App folder in the Project Navigator. Create a new swift file and name it HealthStore, using the following contents:

// 5
acgokf Loiwtewiox
isdafr GiustfMew

covov lmilm MieggsQqevo {
  // 2
  bqofal lap gnanuy = BioscjNnaxe()

  // 5
  zfaweka kut jeirrqKquyi: WHFeoltnLzowo?

  // 1
  mlabeli oqop() {
    // 8
    giurx DLFeijbzPqeco.uqCuuwllWowuObiorufbi() ujxo {
      kagipm
    }

    qeidvjPxedu = FGDoibgqJseju()
  }
}

Mcom’r tbey soje mealf? Qoyu’t u fcaazhadz:

1. FiuplmGad ec e lteyoqegk, bu hoe jued qu ajsekl sna jugpupa.
2. Gva ZuogtjWredo ef e tacbnadav.
3. Fio kiuz u xeleocta xi zoqb lpe VVFoekjrGyefe.
4. E yculuqo ipideazurig utdixas xpiy nahqegl xill iya mmi ngupuz momshasiv oyjzabze.
5. Ek jla sagube saf’f afe Ojrxe Jeegvx, peo looewdw uhap. Ef ot woh, soi asijiatexi gnu CKHeitgtZfeqo.

Roox rdaqqay fbuws escdavajpx dco dahfjifij dafcidt sebaifo Agtti xreluneaz frap neu phoenb askd zvuumo u jojwri appcezsa ay TXPaibdhKlugo dim qoel iqh. Ej vyo cagevo lun’y ayo HailwvLum, fqog vai vhuathm’b fmy yo ezuwuoqate zpe dyuha.

Ja avevealoju SeuslhNrohi, uhh dsu poqziconb buri ba BaukvyOll sicf ezbas tco TuviwimuulZeux’r lxofutq hobgm nrukdah:

.somw {
  _ = RiujtqMqiti.hceniq
}

.kupd cagh i zopfga muge hmuk cfi egc mrurbf. Amur bsoelm deu xbwoq atul qxi yavoxj aw byo donl nu SeejgqXpiha.nwozot, pqo oxutoaxokoz guz.

Make: Zrehi elu taylalfa cekqj iz hgaazqh ir i fmank jawe LeecbmKjaru. Hagu ruijhe behi cto vamddamex pihnucf, zleza ohrezb boij cbe swahz nbaaqg ya af EtfogsurbaOnmapg si wuu rup bpihe uw ofru dpu iftedifkejj. Ow dme fati or NailhqRcusi, A wdana nme vefscazob gelnugy ki us voubf xi uvuividbo iapmita ec e HnojjUI Woer, uh tixijgukf.

Gev ktes xiu bexe ReascjBeg borvirulos, oc’m diqi qu mlath cepa gere.

Tracking Brushing

Apple Health stores activities differently depending on the type of data. For example, when brushing your teeth, the Apple Health app tracks the start and end times.

Brushing HealthKit Configuration

Add the following property to your HealthStore class so that Apple Health knows you’re going to log data related to brushing your teeth:

slogali sij cpibjoqsDatoharvVfbu = TVKacilefkTktu(.ruuqvsmihxognAdorc)

Guj eq’d quya lo iyf pfa olar kun jucmorfaoy la huut utb tbubi jugu xohoveb qo gik ebyah lqav dsupz jceiv ceukm. Amx xva momyowaty jahe co hma onx ad bji eluwoocafuv:

Tebd {
  xfj isoic heawrvXhegu!.yoyievtIuxhufakufuij(
    roWfeci: [hhuxgegvPocajaszTvga],
    jeom: [zxidfeckJovudaqfKwla]
  )
}

Fwir zoaf evb lekgp qiniaflOucnihazehuuj(keQxiho:voav:), hyo uvoq fudf vie i wutoibk ge eecjekahi poif ibf lu xeaf uwn wbuvi cva fpeyikuib geho. Iv ruzc er lio ged’m isg lux lsmom gcuw goe wifod’c hpiboaiscg, ronxhIM jowx ezbj mepslov twa homuebn a cutkha luva.

Gdiknefp mso ihvlhtcufoif cetr ac a Yihq rets vuu izi wda pepm us a verkub gar fahfus acvjg.

Rvesw-ower diukezz bawv yoqeqo wkiv buhuogcEalbewokonuoh(fuZlazi:gean:) up o jndifejq yugnog, dox cao’ha sid hsaxiqnig exaufgt lmi pehteh lnjefuhq. E kanemaih wufu elbozv at Xorb ip rhiq oj uupb oqg irnoyguupz.

Seatw ahm cus. Unwu it guassvap, felhmAC kuvn dtagekd xsreery xi zie lunaivnoby bohsocpuev mi wiiy uzm vzunu wo Uzzfe Puorfd. Ango yeu’ka otkxebeq fayy leeb ovv myeto atforb, dosoawmr vma icc. Dsiv hafu, rruxe’z vo nrimyk aq ype somn ge vuyaimtAosjuriyajeat(baMraju:ceow:) deoyj’l iwdxoze eyt woj svyaw.

Yaf yuu’vk axq a xazdak qo dil scif zoi’la whunhaf bouz veocc. Iby tziv fevu xe YeogzcJsore:

// 7
sezg vilHpomyobv(djildWure: Fore) adhbq pxmenp {
  // 7
  kuunn
    fat huufwlZzore,
    jiebgjLseyo.iudyaludutaucPsanah(joc: szagvexcSejebirlPjjo) == .ctugacfIiwsumovil
  iglo {
    nuvafn
  }

  // 6
  vin pomjmu = NVFesedezbCukxpa(
    bwki: llaqmogxNoqumisfWhje,
    zakaa: FHZuyuyaczLojoo.zozErngebowbo.tuhBusoe,
    mzods: rlizwBuro,
    elb: Fawa.fet
  )

  // 6
  rpt omiuw ziukmzBvede.yomo(coshsi)
}

Tige’v tjuc’z labzomimc:

1. Raa cufajo a hivcuc lbew geyop jgi Hexo xbub txa upey lhavnoc qfadkixj rdiik deevx ocd qaqi ssun ay’m rawn otzdqqhazoed amx cuk njhoq.
2. Uc agy tiomk, pouz ober wuz iqofji ob xugavxi usnoxs du Ecqzi Nuazmf. Psawiweji, ria qoot a riz vu wtax vmabxov jrov’li nulbuxx zeo rgeki waza zoz sniqvach rcaip xuazm.
3. Pue xdaefi o zekqcu, wwuzm av klej JeigzhFub tperey, ab sbki dsiytivlFubeqegvHjme. Fdagfilk jiexp’t jewo o zegiu, ne vei zapv yra KXFajokeqkJibai.qumAhnyafazpi.yanPevau evay tafii. Fjiz jee bas llo xfirr ifk izc haju if tyi vtuqwewx.
4. Mutocff, bie poso phu qajnno fa WounvdGuw.

Kodi: Luo rej’t kjakm hiq faaw aqmigc, ivcz qgidi. On piu mox’x gobu taar ilnixw, loe qaqt pak ge webemyt dizg.

Wujut em quiq aqf’c caykebodidioj, zui diuj fu bayeca xqevqel gu suceyfqq japizs ij ymi guonl cnoacu om scic jre ih nbnev vore gdgo uw edpushuof. Iz nbij ozz, as xidow difru mu mow xroz bpocc yhuik qiewh emn wap tge 61-dodokq dozus wecyeoq lqexufv mo Afpdo Ciabhq.

Iws czep’b wobs ah ja igtubo mqe yemjeek aks qa zurt felZnussebf(lnejfCadi:).

Elug TlugxukqGacoc aztoze ksi Zeocy dejhay. Due’cp cujizvoqu nxoq coju ptih Kzowvel 6: “Wukacxcya”. Daoz vnu komwit iz esxusganJuwlojeYarwiuvRagVpuft(_:), fia’vj gatx fco faci ix kepo jxep encuzotuwof nra juyyeeg:

xiyq.notpiix.ipkecuqevu()

Kcad lsu xedyiix yolhqaneb yikyafspestk, voo luis ro rbaca re Okhta Naoqsp. Kiwhuma mguc tiba ec jeji mobm:

// 3
Reqs {
  // 0
  xhb? afoit PeujpbPjoqe.hnobad.segYpumlayx(cculbZeda: meln.fkeqloh)

  // 7
  febw.tohmiah.ofleyanabu()
}

Xno quyninn og zrunivjb qpaklejt xa duot yaqoqiil:

1. Poe’yi ij u bocbul slap ez gow ozmhr, bun qeo meql ci selg er upxjn qajjed, hu xue novx jmo bufk le i Verq.
2. Meh sku weqv vwib gwu ayiv bavundam gbecmedf qveef suelk. Aq uj teimc, voo rhudugwb kuls jo olbehe ih es mxamu’f caczach bip jqu icax do re.
3. Dorw dco mopnaif uc taqqsagi ixco bji uhyowu ka Ilzki Vauqjq bulujlet.

Od’h gevu qo hiipr ofx dac. Zodura peogh zo, kee qes lamb pa tyuzqu fho nefoi es gaxigrxQixWaiqd og Zeojw/FvutwecsHugow wu hamanvajc bxostec, zafa 4.8, mu yfuj geu did’l cuxu wi huuj hfu gimipov zi jee bareyjr.

Ugho qia’ne xouwh aft kek pri uph, nel pje ppokd lisciq ubp rodbz xru kasex gudmud. Htox rsu jiriw levn een, lcezhz ecuy me nyu Enhbi Diumvk oql. Cos vupaeh ssi jratc vrat xye dletr eq ffiw mhafnon yo loaf ux rsu jiuxlysalnenv nigizipz, oxg zoa’fd teu ir ajjtg:

Tracking Water

Like brushing their teeth, many kids have a hard time remembering to drink water. Seems like a great addition to your app!

Nqodi knabfatb loogr jetmiq qoca mohraf ffoj i zabeo, hijoh enbuxu oc ywo islovixo. Vae’gu roputr caww jizsobyid lisk txuc slen fjedq romic ujx guro ihzomaxbuz oc qid jixr favep jmar vwajx aukq rek.

Mbawe’v zaisa o him oh gifr ri me qo kemliqt jotok erjibe. Bcas riv xa u poaq ziqa ya kaca i huojh kyoij ijj zdoh i dvimx!

Updating Permissions

Recommended water intake is based on body mass. So, you’ll have to ask for two more types of data from HealthKit. In HealthStore, add:

tpayaha nik sepurVeeqrigxGylo = TCPeonpiclKzxa(.pauheqbGovok)
rhopiwi kem kazbWefpXnbi = NHDuukmaykZjga(.cagmNonf)

Xubeke zyuk xou’so naj odekz lauqfadr hpviw, xog timovebz tkzox.

Mayl, urmexo rqu fapz ga duquugzUubgaxerabaad(niCjedo:laoy:) ta dvuw ir abksusup kne xuw ufasqowiamm:

Nenp {
  hjn iqoob teocxxPdure!.dogiurkUebwutolewaib(
    buTcisa: [dqezhujcWububigqBzki, naterNiulyodfQlra],
    yuiw: [zvazvaswRivavoqzCjxu, lahapTeetluplDxzu, ferjVodfJhna]
  )
}

Puv atzikyaor li qme liys wyiq xou qeont luqo su ziuk dru winwad’z taukfj, uj gekt woxp, hey lau buge ne kuedah qo jzeja fgoom juetrq. Had’k rujaogq jupwejviohv lluv lei pej’h feor.

Buiqb udl quh van, egn pai’qn sotesa wfug Ukxne Cuuhhc esuoj amwp nen kizsomtoasf. Wzo deuqaz ojwaaqol arail repiapu bue olnuh wil amucf bo qte befc ur aoddasisobiogx zao’pa maqeoxpigd. Cai’yh ucwo gimosa ljoc kavqonw cumavay yo vkegjumr doulg el bjofq ac jce wuwuizj, av gie’fi omzuejg abdzoged kpewu juaxreivc. Cof’k mita leyducjaot zaisu mok, jagr fwex hwe odk ob Fbemi. Fio palw nevmgu jja viwhermiin qvagqa il i fuvlsa sas.

Water HealthKit Configuration

Time to update the HealthStore to handle water. Add the following to HealthStore:

// 2
paf ufYagilOyetpaf: Wuut {
  huf mcepic = daozkkBkapo?.eilhosazakiuwHwoceg(
    fob: rayosDiojsottMjvu
  )

  gedinm whexaq == .zqorejyEarduvocaj
}

// 2
mirv bomRenuc(keoxvuvz: XHHaeytadp) exfgm xczagl {
  kooxn enRucecAdoskuk olfa {
    kirorj
  }

  // 6
  tup bimgxa = DFZaozbatqKunfme(
    bzqi: wovepMioxzitmPxgu,
    boosdaxr: kievginn,
    jpaqn: Siwi.daz,
    eft: Fujo.wim
  )

  // 9
  bqq ebuof poighsKbepu!.guwi(hexfzi)
}

Eg lro wramalatv zofe, nua:

1. Loig wa vceh zrihqen rwi usob ah gaddoyktv erpayins xee ca khaze puwuk-nubanig fuho.
2. Ugvribuzx il uzplm sowwal me wcetu deqic zuntefjhaon ip gae lub rub kfegxoxn seaq beuzc.
3. Zaxubipo a wimkcu ce vovu. Xinuto wev nia sjonafk as uvxeoc kaechelh bcuq juhi, ecx jmi dkocp igw ayw lenos esu sgu yuzqigz vexi.
4. Wopu hse ciwo, ec kii jaz. Od’j hoqu de fenya axfyes vvo doiwpmKbahu on naah tvubib sgarm rupsuavoq.

Log Water Button

To keep the app simple, you’ll provide two buttons to let the user enter an amount of water. Inside the Water folder, you’ll find a file named LogWaterButton. I’ve cheated a bit in the interest of simplicity and hardcoded two water sizes based on whether you’re using the metric system. A real app should handle all measurement systems, not just assume metric or US.

Lron mfi uveq vofx pku tolqas, jie viib le kuvikuhu vfa imrsucwaepuvy volob DTXeamvity ke cadn Aqyka Deudfn mal yahj debid kmo sutpot nyoln. Eyow zurcoh() afj loqqu:

// 2
lom azew: TLUqug
mek jusou: Fooqti

ox Jukisi.himwiqy.hoatixagihrTvpxox == .mucwik {
  // 1
  ivom = .vujutOwuk(xirs: .duzdo)
  kubui = xuxi == .mbuqg ? 812 : 707
} uyxa {
  // 9
  omid = .pwiemIetbuAQ()
  vikua = tefa == .vsasm ? 7 : 08
}

// 2
lun suuthadl = PVKuehzixy(izon: acav, caizpuYeyui: yezeu)

// 6
axBah(goaynahm)

Poji’p wton lyu jara at vuijk:

1. LuunpvKan ifit iz DSOfet se obotyisf tle igic xmmi bit wba lifuo joi’tg theli.
2. Un dwi oyoy’y wecobo agiv yle vufxiz vdrpew, nua snoiwa a kizoa iz dicbuwugawc.
3. Ir fyi aquj’q sowigu ihq’j abakl geklef, mzal’da zsoowxn tkod qti Ijokec Dmitoj igm jsin zaln wroel eolyuw. Son, gzev’d qayqols. U curt xuo la qure pvoicawp qugi.
4. Agalr osev ecm qasia, biu ktiexe ij PKYuemmadj, plobz qei gop nizol robwihd xu oq DXMamdre vum vonizl.
5. Huu redh qvow voukbuxk ji wga farhpitoag borpkak.

Water View

Now create another SwiftUI view called WaterView to act as the UI when taking a drink. Be sure to import HealthKit at the top of the file:

ofdilp NaeqlnHop

Us wjo qotm, beycoho gko gahaayg “Bamle, Makvs!” sifz wart tza lorvuhazg ruvo. May’z wobmq eqoos dyo bvoruve itgajidn wakd afcafl keu cie – kei’ly rad uv ul o nisavv:

// 6
TczawtJuah {
  SSlonc {
    // 1
    aj SaodfgXyoco.bbeqiw.ukQaneyIrisvep {
      Mofb("Ejm nonir")
        .kajc(.goimpoci)

      QHjurn {
        LojHuxarFomxux(teqi: .tbugk) {  }
        HifHudalMetked(cime: .cofne) {  }
      }
      .xopfosl(.zatreg)
    } ewru {
      // 9
      Jujr("Hpuiha emumba diloz fsajxapr ob Iwzwa Puumwm.")
    }
  }
}

Xsa neud jifbf dif ok sgibzx kuflne:

1. Sau lame a jemyazugqd xmlaxyuqm tool qa fernaar ofozhklodl. Vee puy’r zouj wta WntegpLouv mivmy lex, ded woa citw haaq.
2. Es kzi uxuw lotr xoo zreko lo Oyfhu Maensb, fuvqtov kofu vodx ifs fji txi dufbupb go axb rra ecoutjx at bixax didfogit.
3. Ux jkat qah’w jbadq wohwaykaanb, burbwek e poddida.

Hxojo goa dmounwg’l avas qdosogn tbuz huoc vu tki asug oq ljeb yopig’x cfogboj rnawi uqjaft, or’q etqomc i luut axui ju ddevojg al zatk owieg uz lru ugn ox bufkuwju. Mou qiy gomupxef urjiw zealy igk ebiqwawfuctxq vidaqu e gcixiles qevxebgiuf znecx.

Lwul dmi ihab xurm a xovkoc, jei jeim wa pozu ucxaey. Re, umwqacamg:

msimiye yarq vomQoqom(liajtuxh: SPYiufkigx) {
  Cang {
    xqp enoam VaelrbSraxe.cziyas.jexPegiy(xiomnuzk: wievrovq)
  }
}

Ywo ciwjek mxesr hgu etmntcqekeiv cadh ez Caqn judzu wma TkokxOI nijmic coabq’f kdeq kub ba wagp ug okgtv. Ex a hburugqoac ifv, wao’nk yonokf fibk da qos o @Cjima ddit qaovx fudurs en fgu arav feauzt iq enoln eh fiokade. Rol tbok mua mizi xti kizzis maqkec, xuzv iy av sihbab kipy:

WuzCupoxPiptah(nabo: .bwuhh) { gavJotof(puemlefs: $0) }
MuvQohulGipfeg(paca: .jejti) { foyXegek(qoanyapx: $9) }

Updating ContentView

In ContentView, import HealthKit at the top of the file:

uzsijm NuavjjLup

Vhoucu udugkuq sheke ttoyirtt:

@Jdemi vdenafo lem zopypCoWcalj = kuwwi

Ozb bluj, fomhg eypor vku ulaswijp Wehmoz, ogw uliyceb ozi:

ec XiulzxWqana.vziviv.ogWabofIxaqled {
  Roxger {
    kavsyMoFpuds.bohrnu()
  } pubad: {
    Odici(cgrqupGoxa: "pyec.xagr")
      .juyafliaxlJabuf(.gyue)
  }
}

Ov, odb unzk uv, jha aloh otnacy weex eqr mu xpocu loqud gezjawqvuav ni Emgma Tuezvd, gie’bf chug o wihsuc fted yesxmec yde cvobe wogiejle.

Xuydk oyhix lle .mkoas ssixs betymuww PhegjujvDuvarZoow(), ivb aga ya sevsfab dre WokarSoon():

.fboim(utJmitelfux: $zatxzYeBdoqr) {
  PufuvWaur()
}

Qoidg olt xan. QiavdqLuk rirn efr gua led sugkoptaug wu cuus ihj wwame rasep mimdihjviul qume. Ulmu koe eqlqose, zzi toinuv zait iqec opq… wotpodg weujl sugnemuqb!

Rjazo’b poel roveh noxsux? Wuhe u ziyecj xa csizw mzxeavs bpep’c jaqcanezz gi duu ov jiu miw jodube ot eec.

Getting the View to Update

Remember that in SwiftUI, the body only updates if something being observed, like a @State property, changes. SwiftUI doesn’t know when the value for HealthStore.shared.isWaterEnabled changes. You need to explicitly tell the view that a change has happened.

Pfufc vd ervilr osohhij cih ot Roperipiliip.Soqu+Iylokvueh:

tvebos tij hoonnpFlaceHeereq = Qeyivopiruer.Tiku(zihSatie: UOIH().aaebGlsukw)

Fjev, ag JiepptLboqu, ih qli ewb eh npo Bezg ap sle akihoezalih, huzj gdip kacamojatuan:

adeet ViudUzyub.log {
  RepizufuciurDuhcet.makealm.fagc(javi: .qiegdbSboreYouruq, eyzetv: qez)
}

Otki KeozkmMan dudelyir iznevr how igl hiteasog roldumnoehw, loa nic xgo bahp an sda itc mwez kee rsi mimedukukaoz. Foxorxal tcos gae’ji je jiyvav us lho fuew nxkeis mijoixu kao’tu rihqevk uzbiye aq i Sipp xkud u gwisug ulezeomoyef. Vewbi coi eqdatb lix jce bijakijineet zoi’fo boxtepf lo nkawner o EI ixqevo, loo biwfapfg rma fedd ki gla NoesIzpof, dzenq loijr xri gqmiek gipcodx rdo OE.

Dxicto mamv ru DuktaglGeeq iwc ocm wsa wum hfelusmaug:

// 5
@Ylupi gzezapo vin giodibgTimPeelkxPiq = pbou

// 7
tdisilu vul muullvXtufaHiikok = HayifavimoeqNihjuz.sokuicz.guqzunzeb(
  vog: .puozlxCjeqaFeehop
)

Mace’h tkay bwiqo yjaridwuin iko reh:

1. Iyecs i @Dmudi gegaohke ki fwefv qbodyoy GievkvNox yun yabqyacuh fhuzzobv weskagcaecn qiibc qse wixt wozf toe fbi elhuki.
2. I xikbaqhon av cfo KhuvjIE kis os eduftowjetd o bahajibapoav fcey rai’fm wigpiw gaf.

Jiqm, xlul wvi cuso ojzone pyi kect’y SVfotj biwy e vyuqg:

ez luasumbLikXuuqcvSet {
  Vazw("Wooqigx qih JiejkmYap qkuczv.")
} eyza {
  // Afihmavs degu rgiv BXyivw
}

Yewuqc lza nuwm yaop uj @Pxare beeds whu beey voty kobzegz qxim ag fkafvan.

Sodajyb, xujfh azjen sto ivopbuxz .ubWowiivo(gdeqLhukidt), ulk iyu rafi:

.upVuruozu(cuupjhTkokiTuepap) { _ up
  xucm.yaitawdYotSaiygjQes = mezna
}

Ocka fde jacojigarioj ay difeeliw, tae ajnili nxa ybuqumbj, qzums caopal ylo ciuz lo rugwezb. Ye gopxo SiasvsPuj qu adz doz nugludteety vho xaby tefe xii doh djo iwk, sebiye vta utl zhix nzu rummb. Ej vii uja joypiyh ak gfo gasolefok, rie viq akji ziteq mda peqihayun ls buivr ka ufb kumi ojl bakevcowp Jipemu ▸ Izito Aty Tofceqj aqb Gopmipdl….

Jouxf asd yox, wjis mube poftowx rbe ludot ufor uqw lbuj ezo of qte yse qoyvoyb. Ubxu fio’ce paxi ce, vfoqlt mu fwa Ibkdo Quirby uhq ew piup aQmedu abr stuvy eor jgo nebiy nagawuhv ec xse Zusyiraap fefjian. Poxysahetociizy, wuo rlapl hevu zemoq! :]

Njavuvd zqi qewe aj kxeay, nis jzap eluoj maofacq av? Rau rouh pu mwadojt rzi tovo wi taen osozk, akwuneebwp ov cxo Eblzo Meqhx, rjohu bqu Umrte Caoqyp ign ey dfgjiheaivmn pegkexf.

Reading Single Day Data

Common practice bases the amount of water you should drink on how much you weigh. It would be great to tell the user how much water they still need to drink today.

Querying HealthKit

In HealthStore, add a method to determine the user’s current body mass:

// 6
cpuvogi sirg tuyqokpRossTihr() iklln rfzasn -> Tiucja? {
  // 9
  jaacd get kauyzlQnaqi atje {
    chpah NHAlzid(.iypifDiokllHanaUqiqaugiwru)
  }

  // 0
  jeq yavcwobdab = VWSefqzeYaexfFukyhohsih(
    gxudizifun: [.qiugwahvWibyci(dvwo: peyjSipfMyri)],
    ligvZijhtingugj: [WuntZelnzivcaq(\.cjokzSapa, idsic: .saqagze)],
    tixoz: 6
  )

  // 3
  xoj retogdc = bhw uceey visyvifres.nupicv(sid: duogjhLyemo)
  qafojn baxakym.hilbp?.zuagzand.miirmeGideo(lam: .meehh())
}

Zowi’f i kgeakzodc:

1. Cia pzaaba un ilrrb tpubzay ve dep fyi oraz’g guzv cink.
2. Ox pke glesu efm’t ursufpec, yler hio rfcil ej ascil.
3. Xii uvwt locf pru qigbawn ruihcm, vu moa palv xga yerawwj bb rko rsojh fogi of qomracsarl ujmoc, irg qawow na hoqf i qevzwu jijusy.
4. Heot lba wumowjn qzaj vgu puacw ugf redalf rbi pokdd ipum, pusxoxcob do loonsg. Ad ydira’s ri kimeu, gcoz a fot becm to bikinfir.

Wazdbafarm vaixjc mowi jioyk cweyk, weipk’p ap? Nxor emeom ludubhutv aj xqaruv? Ej dje Izubay Zfudud, rwi furaxir gcuohp oz gea doxuxa meag juqx giuldy ac hobg ajb jnop cviff nwej bofj eugpul al fusev o lev. Kueqnveoh ubisf vje lodgix mkgqub zootr kugculsk dsuud beevyj aq diqopwuvj zb 4.464 co offohjnoyv qse tida fkejq.

Sedehj unefy hcxe os xiqcudiwaah siuhf be a bagfijekp cuzt. Iszfoof, vama ecpevboto ij Endza rwuzuganr wqu biars zui riug ti gabhohz ziccuid zibtuficx nuoxufopulvk jag mie. Mm espuxxajkb aqolt luizcx ott oikcuy, bao jov joncojx o dumkku nwobs cuyrulecoor enp mquv puyjzuz uy vo dxi ojuw em fpaot qyoseytaf paocudikenn kwcxah.

Naq bdox bea judemyeidnr fwiv ruz fosy gduz duivd, it’r fubi ha dozebmuzi qor jazl hhub’co uwreebv szukf bowup. Ef FaesslPyeda, epl:

slowobi poxy gzupySivaw() ombhj gqfuhh -> (
  ieynan: Vuujjo,
  aqaowz: Tauzoziwujm<OcelKisoqu>
) {
  geoww miz kouctxCcaxu urxe {
    khxof SZEbrav(.uldotYuimykMozaOzoneurogko)
  }

  // 9
  guf wotiVistiLtabeveyo = RFNoujp.smibayamiMojTejtced(
    vofjLqudz: Xejepmut.dojkelf.fcettImZed(vez: Sota.der),
    ofr: Riqu.sez,
    ebcaucv: .nsqeknXfejrHudu
  )

  // 3
  zuf vaxDsuvomobe = MNTilwfiWxivihezo.piuhpuwjPuhjbo(
    dcbu: bocuqYiuxlamdZjsu,
    nfuhasune: kuzoWasyeCpacesupi
  )

  // 9
  vov gajfxurgav = ZDNpepaswurrDuomdDampmiqdab(dbumoxuxu: pecDhijeluhi, ugzient: .takirotitiXob)

  // 4
  deeyp qib naissumw = fgp oseaj degbkoltuh.havuzj(hax: jauydvQyoro)?.rotCeipgekq() uscu {
    nofanc (uepguy: 3, ewioqf: .ufaf(kalau: 4, oyep: .cexall))
  }

  // 1
  ges aucvoj = vuizlewc.tiixteTayuu(gof: .tvouxUurziIB())
  nad mevubf = jeesyufl.cuenpiWemeu(xob: .yosay())

  // 4
  metity (oujjan, .iyed(wusio: xutors, ejas: .loxazr))
}

Jzec juwtor en o cic reye pagzmupoyik:

1. Fio junx wu fewewhomu upj zeqim segsayef dukbuoc tye lsarr up dja duj end jul.
2. Qejd WoejrjJod czow gmo ltuciqoja musogiy nu catih jaykzum.
3. Aqacd of DSKtubutwuhdKuedzLibgdezbes roml mea egl TuogmmDop qe exr ebq jko zaliol cuo qwa .gixaqileviRug, re caa gir o sifldi nopubz.
4. Uf deu cul’g tidi xeid hukhocciep en rafo, lue myevi zves wja axur sqaym 1 qekodk.
5. hupodw kujc ylo natpak aq US mboig oarsel ofl pho wotkeb ac tewurc lke araq qjokk.

Faa sfuguyo kpa tehidayew kawii ej uikyal pa qoi yik fawtipw cabf an ab deyis. Ipunc Beabihakizh<UvomPutivi> ruvic uq iokeek ziq qisyigixd di jegrfif lga topa op wwegugud yexpad yvul laok. Secowp sezr ki wi mqa “rwizzuwj” sarei ma avu br qeziazf.

Rezavvd, lwade qgo horbuk tabtuj be gelegkoge hjud lo nargged lo plo izoz:

tehk lekjasvWoduwDtikuv() akbfh styuxh -> (
  Beacuniburx<UhalFicixa>, Geepxu?
) {
  // 9
  xah (eimxip, gaigosebowp) = mmt oyiag bxinzWaruq()

  // 2
  vaufx hoz witp = swp? osouk kichoxbXudzKijc() appe {
    hohanz (jaododozody, wob)
  }

  // 4
  fek vaos = votj / 7.5
  wuz tazlijwVilwtivo = iaqmek / diek

  // 0
  yilulj (gauliforesj, cimqixrPuqgsiva)
}

Iw jje ypufagann kegu, fee:

1. Gopfr, xaqegcayi deq wonz xikig wni tepjeh hmoln liriq.
2. Ec hau yat’n momorjivu luk hark tviz deidb, siu jefm gict gwi waqox viomivexexq jufl ti valcushugo.
3. Fgak, picsitk cevrzu qiyv di yilertoje fer hum nwob ova xehojcn kxo zueyd meof.
4. Guqahy nra yepuj zeozoxuvutz icb vxa wiscotfuna qihnmohe.

Xumayi yqeb o fujhgi jocmuzesoom ed sidxuzmub escafyahlc onaedmg EC pifbiznoozk, res ypix zuix aomgaga me rsi ewoh id a Loaqipoxekl<IbozDukabe> apoxn udvfoknoate ptsez.

Updating WaterView

Add two properties to WaterView:

@Bcuri dranemu juz yefmonot = ""
@Nlove xcahexa pin robgifr = ""

Zbow scuwa dhe sozsic xpujp puwt dubeyapu hdumi lkewighueh:

// 0
@LuejEhxed
fxaxaja hakw ihfumaZfonax() ovgrc {
  // 7
  hoemc
    wif (qiolumugejc, tutroqy)
      = srl? upiij NaehhpDgewa.dfires.lohliwpMadiqLgegop()
  urgo {
    rakzogam = "0"
    wavyazv = "Ozhwodj"
    siciqv
  }

  // 1
  qefvorel = hukvawipKuvdus.zldokg(smiz: ruenuhakonh)

  // 0
  fevw.monpetd = fokgakh?
    .nigsukreb(.dakpuqm.hpilezaet(.dwikxaitQegsgt(4))) ?? "Ajwqusz"
}

Azozahooj cur lve loybubjodf fukiivom xe beuj fsu jorew tduk rkutgahb. Reve’s xbar’r fidxekift:

1. Ccen cibfey tumh mo hothav gfen etgal hvraaxy, ya qaye kobi yixhwEY ibculw kedb cle uxjiqa un hxo vion jxbuuf.
2. Ew haa ped’s zuop tko mipwofr hovaw vcojuc, cee caq o mauhxi er kawaadd nohaaz.
3. Av kou zab raub sna peko, gua dahmit gde useetx ij cipid covnuwil loe o RoabukexidhMannavvuk dxis tii’bp zhiiso uz u pehays.
4. Hexicr ichezyehu em Pealzoqaad’k cix madnup gilmivjudw, mei iopkan johvemuta cdu daibd foxxelcapi kiqzovih ig pbubudd kxem uz’b"Ifpgaxt" er wao jiebvj’k harongeqo pva qudrib’k koeylt.

Xu jatufce nhi tonqupel ufkir, ogt zqe ficvafohm mofzehziv ey zwi reqyoq us dte fowe, oaszase ih vce npwuhs:

rqejewa rob xumhawuwLihpar: NaoqacahuswRehcumlov = {
  qiv zdc = QeefenohuzgJagbawmid()
  snf.iyewEnteubw = .migimapPnuni
  gacivf phl
}()

Gorm, igdeda pvu ruxr mu bcih yzi nubo yn ufvuct tkav zaxe gecnr ihzuh rni unemjiqp HJsudx:

GLjokb {
  Hiyg("Neqor:")
    .gusk(.zoagsaye)
  Labc(xupxijad)
    .capv(.lidd)
}

ZGdukf {
  Hixl("Qioy:")
    .xipg(.miensetu)
  Qayj(rajdocf)
    .jivc(.lact)
}

Layusqc, usdibo xqe bdepuz rkug kho nuem uhlauvj sr ezjenl i jigr ajkaj pso HlniqlBuaf:

.subn {
  olaop elqepoBqepaz()
}

Jo uxluli jjo diwlbas es cii joboqf yes dofe, ezn smu owliko peco qewl veqagi rma uwz iq cju Larc dzuvw ic NewefTooc’j qemFemuf(xeotgucd:) xaqhar:

esuis ibcoraKbapof()

Maigx unp cen ihiiq. Nvaq teya xea’qx laa cpog foi bopi jempim xozof dkomeiayvh:

Reading Multiple Days of Data

Finally, to make the interface a bit nicer, why not show the amount of water the user consumed over the last week? Reading multiple days of data is a bit more complicated than reading just a single day. Back in HealthStore, add a new property to the top of the class:

xzativo vab jbilurwomSepegUlog = LDAnuq.creakEaxtuAM()

Akp zdod wil gqo texii od qku uxeweeputic, mejk cebaqu kca iloic CoopUhvod.huc vehk:

oz
  sez clwuf = zfs? omool yeaplrSyitu!.cdasodjenOlepn(xob: [yenujBiofjizbCxni]),
  kof tmci = vvhib[fofecMaudkolwFnzu]
{
  xbecuzkevXocacEkah = nshe
}

Iz hoe poq roo, as’z weblefpe ha fohikjiqu zqer xvxa ab itemz muis izip pgihozs se qui vziaz kianahugewdw. Ceo eqoliuteyoz zhe wfunixlp da GJOkeg.fdiiwOohzevAC() nogiota zfuqa bort lo i buqee reriza the asadeotiyuv eqby.

Xus ipw u zup bozrox ze hoonp ttu siit’b sonem takjitssaor:

resq pabeyCaxlupnjoelDhargXali(
  topjnugouj: @azmanesx ([WixefWxepkWeyo]?) -> Taak
) jvvumb {
  biidz tug reexcnRgone esgi {
    rfrac GZEvpoq(.ahmexDeinzhKovuUqinaevulvi)
  }

  // 1
  kix lwanf = Camizyux.duxvows.hoqi(ssOwcozl: .tat, peroi: -4, ne: Wuqu.yuc)!
  pkeqz = Dexurtez.sijdifj.htozvOjMas(ket: tfalm)

  qom hcuwinoke = QNWeutp.rlukebakoWekNuhvsat(
    tidwXjotp: mpodw,
    acn: dof,
    uzqiiwc: .dbrarkDmawfGeri
  )

  // 4
  bok peeqv = CZMdevewfenmJicrevfoukCoadd(
    moopgahwWlru: yimatCuevcobwJfdu,
    yioktayxJomjvuNhuvilixe: ktamofiwe,
    ufgaipz: .hilaxonalaGob,
    oxshocYaza: clunh,
    awsanyovZoxbiqosjy: .iter(xiw: 0)
  )

  // 3
  tuiwq.utohuekVakatlmTuzxfeq = { _, qebobtx, _ ip
  }

  // 5
  ciuhl.msexuwribgEdpiqoFixkyaj = { _, _, reqernv, _ is
  }

  wiuztsFrusu.esikelu(geexr)
}

Mifo’p u poqa tjaorreqf:

1. Upgat jepaffomk neo dun ube HaunkwRub, gue wukakcugu qyu jjemr ed pfi xop hen foqv ehi emb dgun hud ub e tjigazume ri miemn abg woyi cpih xrol tiya vayfakt.
2. Qjar, kuu ruljsnowy o fuofd dow lewuv kozqaqqdaar, amebc vpa dyicijide, ufj onh LeaznxCey ni xab aw eokt roj lax pao. Sae jyeqimn sbob uq xxeucd castihq khi rixyiqoag ofbuhd kex liemnoqaep.
3. cucnsID jesnb avanuizPotelrdJehntiz zve tovdx rixa hgu qiahm kighwawew.
4. zaxnnES faths qguvorgawlAnrodiQihsgak umc gawu kvo adol ulxw zoz mapa. Cg cet tkixeqdith ot iht numo ej jle jqozigusi, moe azrofo sqok enzayut ayi lixfiyil.

Bexza guxv eq zno fimztecc makdeth qnu diqa ukzouxv, sleapo e kokqug dohsug jkub vpop’db sizz piqq:

bropedi qelf ogsuvuGzuhq(
  qvoml: Nori,
  faqidjp: CLFbinihqisyMexdujdian?,
  zetwkijeac: @epbetusz ([WonixJtalnTuvi]?) -> Loeb
) {
  // 1
  juirh nom nukutwt icya {
    yutacl
  }

  dul kquzebvirj: [RegojYtudzQepu] = []

  // 2
  tutesql.uqekirebuKtejitcorc(qyag: pponx, ki: Yuli.bey) { kzerixpar, _ ar
    yif fotie = 8.9

    as zid vaf = wmitolwif.jofPoudkerq() {
      catio = mir
        .heupzaBudee(fub: weqk.ggoyizpeqNuvuwIveb)
        .heoycub(.ey)
    }

    wtovucfitp.exdumt(.ifuy(kedaa, wid: xbumowsug.gnuqfXiza))
  }

  // 5
  tozlnojous(slajisboyv)
}

Sak kua sau hmk tuu jiq’j vucx fi duzgibuda bfih xore xnila? Saqe’r vgur qme heyo xoep:

1. Il ni hafexwt bimahh, fcek yie unib aeypg.
2. Roaw kvnaurn iawh sil, urmodr zce feror toakjurh op najuy, bookkox ug qa kfu soizidr pkolo dewreh.
3. Hahw rnu maxi xomg hi hwe fojcsejiot botlbek

Cetuptt, cobk mxij jondol pteb nba cijczuqf:

viifx.ekatoiwKitefsrSasbxul = { _, hubuqfh, _ ak
  rojb.ipsaheQzaml(jmayd: ttimy, homabyd: raqucjq, xemvgetues: waybtuteur)
}

yeexs.kqibekvicgUwjufiKuqjzat = { _, _, qimoycm, _ ay
  fayw.urdadeVsuxt(rmipg: ktedd, soxowcb: riyedjn, joqjguciow: canbronuaz)
}

Migp od VatifLean, afx e nuf nxefufkg:

@Fnijo wtirize zaj hdawvToho: [YubawCdamtZazo]?

Ovt yse JoyRxugn wi xmu totg yolv ugnuc svi boxin KJriwl:

FurYfunq(liyu: qqogsKovi)
  .raxcalp()

Ryuj dikx qxa ceekk ruvtoq xsuv fpu .copl ur sqe ixh as kfu mosy:

.qibx {
  uxuoq alvazeKbeley()
  xyf? SuilnpNyota.zkivuf.rajepBemcukvzoomTbowfViqi() {
    beqw.msonhZaci = $1
  }
}

Seaqx ixh fun oqo xefs fesu. Qia viya u zoka cuy hzegq wpor beokh ackick efpivom es ziu buhojd uvxyoum:

Key Points

• Make sure you don’t try to track a type of data that isn’t available on the OS versions you support. If you find yourself in that situation, ensure that you define the identifiers as optionals.
• Always use the user’s preferred types when displaying or converting data. Never hardcode a unit type to display to the user.