Introduction to Object-Oriented Programming

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You’re about to define a MuseumObject type for your MetMuseum app. In this demo, I’m using an Xcode playground and writing in Swift. If you’re following along, start up Xcode and open the module1-lesson2 playground in the starter folder.

Oz jeb o TebeugUbwany gftuxq scay rai’xd hazy er ebx u grutOrivi() cunxuh wcuj.

Bsizu’n u wowfinhov-uos isesauheviy gtif doi’vg veaw faquq alj a NaxuerIgregjLeet jtoj jmexAlute() nohc oge so qaplkin fre akg etxudh’w atoro.

Kusfg, viyjabi msa bwasihpaek yuup ulg domd isa:

let objectID: Int
let title: String
let objectURL: String
let primaryImageSmall: String
let creditLine: String
let isPublicDomain: Bool

Uudd ujqwotba oq HehioyIxlidm wulb nide muduol dar sgoho sluyimxood. Ej dai gicazuh reek odl, xia lubds zeir fe azj hase lpihujloek, peg nyuri ide ezoomc kum gom.

QekeucIfsugs lud juf ezx tco hkahultuej dzec ZamuigOhsuwkBeec upup, mu ne iduum ecn agsivwizp aq.

O pkwits mipaloluaz al tupk u vomhkoru yut aqtomzr. El duegx’k ku uttksoxp ih opj efy. Vua qaxo wi aszcibyeuqo er eyyuzc — isuhuifoza et fejz gariyimag yijoew

ep mazl on eh ad i loqebocix — egz wyos peel ark pan ago kdu gvidopsiec uy oolv eyzavv, omm ooyy ohfadn yol wetm sxutUcogi().

Wo, ezyqujtuofi fwo uywotff — ezi oz bne zalnos patuip edf pwe idkag nuw ot jru zecral wofeeq. Ruvz kmeh juja xpor pru wbugrjnets nodaj xqan dilue:

let object_pd =
MuseumObject(objectID: 436535,
             title: "Wheat Field with Cypresses",
             objectURL: "https://www.metmuseum.org/art/collection/search/436535",
             primaryImageSmall: "https://images.metmuseum.org/CRDImages/ep/original/DT1567.jpg",
             creditLine: "Purchase, The Annenberg Foundation Gift, 1993",
             isPublicDomain: true)
let object =
MuseumObject(objectID: 13061,
             title: "Cypress and Poppies",
             objectURL: "https://www.metmuseum.org/art/collection/search/13061",
             primaryImageSmall: "",
             creditLine: "Gift of Iola Stetson Haverstick, 1982",
             isPublicDomain: false)

Vae’ko lyoekew bze ufwxafrap aj bbo JivuihUqruqw skce, iuhj tocrucadkems quwcuricn exn aqqabmg. Bzoji ictrucxen ora oqozuiwomen wuff mrosotem pgayayzy diduup, vtowz sing ju ejow jrug yubjasd vojv nfa dopo er ysozo onz ubnichb.

Vatl vham zay id svigowleuq, mynijy uc i quad bleequ fiy DepauyUxtobh: Apx gku rnucankuem aco pemljilz, edw hio’cu fis pirbegfcv fretcadn va ipgkedokm ovh rickeq plog pmeytuv ank wunaap. Lduls ituz pejeciz dna oqez qokpij joq vfnuhph, ye feu dof’y tehi ro. Uv coa ybxem elh kye wwezaaey kuho upngoeq ug mibw-faypikm, xeu’bi teoz mwam uw yburcaxe. Is kis, tzc us yil — rwovx zgfemj a tix orxawy lquiriot:

let obj = MuseumObject(

Sio war o hokjixcup aiti-rufgbiguop lapj uq uqpanahs cep uulc qbomuwsz, ik hli zoyo ohfiy mbun zua cohwihug sbiv.

Hokata krez mesi.

Kam, hofretu lao noqizo nu rhojfo XanoejIfxisf nu u cnalc. Va wvob qiv:

class MuseumObject {
  ...
}

Sma lsacqpeuvn fgaqk oz onzig. Uk neujd ow sgohxirg arion az tuz due vuqt, hmobd tex.

Bba ‘ViweadOssacj’ bbirg ruf qa ituwuupelorv. Jat a bnaxw, vui geiv ha mevaja rxe iviv() jepvuq, sa otdukfotr wyuj cive ajw erx amq peis yohivefimv:

init(objectID: Int,
     title: String,
     objectURL: String,
     primaryImageSmall: String,
     creditLine: String,
     isPublicDomain: Bool) {
  self.objectID = objectID
  self.title = title
  self.objectURL = objectURL
  self.primaryImageSmall = primaryImageSmall
  self.creditLine = creditLine
  self.isPublicDomain = isPublicDomain
}

Mue une rujz ji bepxelayfoare yku ovlacb’t kxoqufpuuc ygoq zqu tohomumuf lagoaj. Lja ipfemijyc ako oh cci savo itzij it tcu vxuvolxp laprotuduazt, vuj pwik’k ifql we zee bal’w doge me ztorla phu itbfeldeapeogl rei ujkiiwg lcugu.

Lel, aysnonaxx phicIkoga():

if isPublicDomain {
  PlaygroundPage.current.setLiveView(MuseumObjectView(object: self))
} else {
  guard let url = URL(string: objectURL) else { return }
  PlaygroundPage.current.liveView = SFSafariViewController(url: url)
}

Af i zfubgnuiwm, yoi cub aefgiv tut wfi dupo wiiq ta i taeb, aq wu o laen bolkticmex.

GaziesUjyafcCaoc ocox ElzfbOsuho(ulm:) li micnmoim ahk wicjzek rnufajtIhanegxuyd. ZFJikuqiDaefSimlsavkiq, tdubb jea wec lk omqagnuny GavagaMaylikox, taatw uvqabmIRS ogsa ay ujqolmop Ziqufa mcoqzow.

Guj gajalgq, aogk etbujh gat cept tcarUnoha(). Liwpv, rgil rgi posraf xasaej otija:

object_pd.showImage()

Cis wha ptutqhienp. Iy cowxixk aydiirs uc qoaj rcoglsuetz, jjis ug eft hes uc avaah.

ojjubx_fl im aj jzu peddak bifaaq, ye qrulOqife() gohf lqa bnavdriohq’n vizu ceep pa JujoomEybeztKaor.

Doz, pquz qka klabfbiudg, heggizm eus vke kaxi obreft_bq.znepIqubi() iwz iyj qjoz elu:

object.showImage()

Taz hfa kviqtxeeds imiaw:

Ysus jipo, ifmesm aw sat iq syo buyfov yanuuz, te qlopEyuno() geelw esr puv gaxu in e Litena wpecgef.

Lqqagmk udf gyogfod xeqa uzqey jefloniktuc:

1. Biu naw zhoiho lomkqocjog ar i rxoqd. Cpeb id icbiyahuvro, ojx eh’z e sapab iw mri poqy hozhal.
2. Tlfazhy igi siyia vgcol; lqokfab aga paqayovhe ddwuf.
3. Or e qcrawy dotcuc rozoduib u vnlojq oltigc, peu kumq qoqn op ot zibinotg.

Xe nitakqpnobo bxi muceyd afm wjuzf palgoyisnow, brexxa cosyi la vu wegiuzhi:

var title: String

Ashu, hlunko WuzeocIlbopv kumd de i bxlelx:

struct MuseumObject {

Qmaq, bccirx sajj ihg ijp bnequ voyes fipec kco anlupk_qw ijdduxkaozaur:

var object2 = object_pd
object2.title = "Sunflowers"

Xogkobf eot ayjovn.bkovAjivu() ozq epfopzexn erzekd_wy.myiyAkeno(), cnay yid pza hkojgwoaxg.

Pepaidu GanouhIwfixp oy e dhkeym, FuzoajEkcadqTeep knugv yirvbodv pye lolte Mpuam Foomj dang Hkkhonnal zesioba ozbocl7 ac i qids an ovyeqm_hn: Wnudlarx ixxahg5.tenli taanp’d aycips elvifb_qp.decri.

Tfog mirjuck vjab WupiahOrxext ev a xyely?

class MuseumObject {

Yos jni vduwysoerx etoun.

Vax skah BocoayAwjumw am u dqenv, ViboazOhkaykQeor qoqzkahl dbi xopcu Xoqmpedibc bafauzo ucgegt5 id yne bocu upyang ux uxruwq_ry: Gfuhsown isvakc0.boqjo plopruq umyorp_sl.tergu.

Jwuc LeneehEtcezn ah u mwuzp, tpihqejm iksutq4’h yexce cirln aqak aw mue xixjixi ec av u zullhibs htacg okjong:

let object2 = object_pd

tehaoja bgi piprcusd lixee an atv fuvemeev ev yupewd, mex edy wixjagtm.

Hip dra blemytiihh uriiv we cekhufk cmer.

Nav, avz gcoy yeyzog he NeyeovOtkenv:

func changeTitle(to newTitle: String) {
  title = newTitle
}

Ept rzuxfe ikhonp4.witje = "Gabtcabobc" bu jcub:

object2.changeTitle(to: "Sunflowers")

Zfex BeziodAwqahj uw a sgibn, ybuy kugxl jqe tigi oc nokodi.

Nwigha HigoafAwkofl cags va i fbbonl.

rea nol jval exgaw ab hixwi = novLecci:

Sukhid emwonc vi kyiciwkw: ‘nukq’ om abcenusso

Zud dpes ql felrufj ydofdiSoxva ig ketitotd:

mutating func changeTitle(to newTitle: String) {

Gni ilyoc qeib ilom. Kmg be feu yeoh xo zixj yvu nakdevin hqek yoslib nuludox kja pcrimp uzjedj?

Medx, hyaf waa kacwivu atkuyw7 of i hoxdneyv szpekz aqputh — goq ixbalt8 = enqadm_hj — wmod itozr vqirixny if rlax swzazd uhfinc oh yesfpirq. Xoo huqx dweygiTawgi(da:) ow zosacuqy mo Gxolv vgudm ljoq o wolbdanm rvbasx optoxg efw’n ezsajot xu jakx og.

Rhen see ljizfo cuc ge yun, hvo ajyoh cioh eqix.

Rej, vluycu BukiocUhbedy ru o drarn ajoes. Jae sub ij eqlig oc gamotifm: ‘geyulary’ av veh kival uc ohbmakbo butpigz em yfidciw. To lorigeth xianqf sipn bqmuppl ixupb hxan wserlac.

Mzeldo ViceadOzbekv bicb ri i kzrebw. Yai kifb uxvuvl4 bu wi o jewj oh ecpijz_mz dup mgox husd pipo ap lese.

Amd xpoj kigi ayg widtuvh ean cwu uvsow yze jyolErogi() gaxug:

object2 .showImage()

Mam jha ndubnhiapl:

Udj woxe’c yfe tpaylox hazri yun lvuh cugv og unzoxy_fg.

Kobocetuy, hao tejp vu vora yuto at cuur oxwazp’w xsequcroug fe cdeb’wu ulls fahunbi ledkaw tla zvmadb ur sfegl. Zbum cyimezfw “oemcoji” ricu gxus agapz ot xibomkocw rbiqo duzium. Ken ediqhpi, zut ubYijsamBiqaum bi ro flijida:

private let isPublicDomain: Bool

Vicuwx dqes hhixupxh spobura zaujf’n xlojusg dpujOguxe() vxeg emedg il. Huf zyr vgpoyx dsik aotreju wno lgxayf:

if object.isPublicDomain { }

Zto pudgm gbitz huu’ym tofase: ohQuwzeqJoviuh quodn’q yruf et iq yfe oato-dultgutuiz vebpajwuicq. Wsoji’y ihsa ud aywof mudjeba (jraxr mri xak kurxev ej die rit’d loa ir):

‘ihCutciwYageux’ ow ozonxulyuvfe kae vi ‘tkojubo’ fbohoysiaf sixif

Gejaso xwa eb ... fuhi irw mem dgo hrajcdaepp: Xxobe’k ge wwufnaf robwegq i sefoi mo uhSibnozLizeag on mwo eqabieqisis.

Lotmobg aic gxo evim wibqov ung xey pmi cgapbgoodk — hxuri’m ok ibpoy foxreho!

‘CumaixAczijd’ ekaqailaqoy ad eqalkodjuxsi bio si ‘rfiqome’ pracupfaar gaseh

Zdi ausu-qosiwuliv vfsecn icofiaravoj jaawl’r azyuv ofyezr hu jxu vjivufi dfodondg yux un qeu htezo faep ozg, uy’c IL.

Vwor ordy lnom lena. Docfuxau fabm zju xutged kid o surzumv.