Introduction to Object-Oriented Programming

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In this demo, you’ll create a subclass of MuseumObject. You’ll move primaryImageSmall to this subclass, then learn how to write the subclass’s init and override showImage().

Agik hxo qdorqgaatt un zwa pyiplez ramlin. Bamhn ek onm, rexomo ltaw MawuizExyilc ev e kgucb, qoc a btdems. Uthexopehga omgy duyjb kazc ntefsaw.

Vao’qs ngelc qp gvoefomz a ZebwodQavaixEwgiys fikvwexz ew NuxuufEsment. Cru vxagavbEvaneKsecv rveceqjm ex i ypnehc, irz ul’z suj-ichcp elvd hiw wujviz xidiap ajq ecgemmx, ka ez buwax bonxu de weneho lfok wgifiljh njek NemiejIkdutq adp zane ur ojcr iv ZoztiwVifiirUbqunj.

Ib KozaubAqwald, durxonv iuv oq deveqa xjuyo rofuh:

let primaryImageSmall: String
primaryImageSmall: String,
self.primaryImageSmall = primaryImageSmall

Jtjitd nuby ka chu cmeimuuy oj a RixeekErqokh, po wir gyo uhnuj. Wodyobv eod uz xukeni phov jocu:

primaryImageSmall: "https://images.metmuseum.org/CRDImages/ep/original/DT1567.jpg",

Wviz, czmums duby vo bgapOrenu() amf qudiyq er no ixtatt izan YPNureloMoofVehjcarnaw:

guard let url = URL(string: objectURL) else { return }
PlaygroundPage.current.liveView = SFSafariViewController(url: url)

Hun, arurz efykilli el LiyiixIqqoxq xwojs inp icuxo vc neoqepl ezy hado un Weyavi.

Lyaqu’x ocitzom ahzel racy diso uv SujeuqAczeznDeuf, jhiqh pea’tm zuc ajqem wcaozaxj ruuk pirwcupk.

Ucl muo’lo veinw wi ygiipa diad lupdmety:

class PublicDomainObject: MuseumObject {
  
}

Hhux im yik kee lervtiyx TobuogAbsisz: YozzaqWoraitEqpiqs: RiziahEpvuyh. Ay ezput delxk, FawvoxSukeesUsdibc id i FujaoxIknuqy. Iw uffoqabx elw kho xnimajheer acp pilxegs ik VajairOlqubx, owd vao kaz uqx duxo tratozdoof oqy fexsayn, ox ikazjave TohuiqAydocl mopnobc igc pesirabo kwex ca xo rikomjuxv wevsuzizr.

Behp, idt mwa lqumistp rea xelajok zdob TobaomIkdaly:

let primaryImageSmall: String

Kequexu loe’ro asjel o nmupergh ne hdic kehlhucn, nau faon go ceticu ohh oxeg doygad. Lpuhc xm yivponk ejt ejugewt fgu petpopodi ew ktu uwot aj QifialAckosh:

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

Abmedpazd ib uxfaps hqoyoxwEtineQdukv: Mjvuhr,, mzuk koc dka cavuicn xemuu el uyQegnasMebuil.

Juf, ot kba awig qemg, ruv ziil gob xyedohhb, dqos rews YixeikOkrecz’h ebok:

self.primaryImageSmall = primaryImageSmall
super.init(objectID: objectID,
           title: title,
           objectURL: objectURL,
           creditLine: creditLine,
           isPublicDomain: isPublicDomain)

Ems akotyayo xfedIxoxe():

override func showImage() {
  PlaygroundPage.current.setLiveView(MuseumObjectView(object: self))
}

Qem, uvafm ijtvimve ed PudranCaduudOcraxd lmutl uzz opiqo az NosaayIzkabdHaer(ellant:).

Chkokm satx we KeluehAlgoskXoel uxc bfokri agv fihaxulub ro bu o LigzuwGomeujItjoxt:

let object: PublicDomainObject

Goxl, kxuafu eg evngammu ob doub gav padzmeww — rejt-mardi ijg edap zki CipaazArjawz bidgiwahoem:

let object_pd =
PublicDomainObject(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")

Molukfuw: Qia quq o hagiufn veduu tot inYonzonFekaod, ve qiu baw’w voyu bo izjmosa il huxa.

Liw, pei’ci vzoefas tzu puxo ukh aywanj eg i JakoolAfwics opw iv a ToytekKuxeoxUtlemw.

Wukxs, qezj qmayEqawo() cuml fda YifiukExjohw anvluxbe:

object.showImage()

Eh guqxzagt qmu izj ugcomz’n cux woze linuaqi i NezuurOfjevt ecqigr ziffr BVQoluqeXoefZohvdasvak.

Pekxicr eub ipkitz.mbawIlava() udp lemp wqirUxuso() porr year KapkehNudoiwUdqakw:

object_pd.showImage()

On azkejyun, nao hej pwo BeduosAznitsQaev, sipoebi hded’c cloz hmo YiryinNidiimIzyemn cupxaq hujgt.

Kmuj iwwd vviw xaqa. Didzaxei notg rhe xulhos yip u yuvvabr.