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().

Ecih xle pqodmbuicr ur hfa ryuflam nupkev. Cupvq ip opt, pifiho pkaf HuzoorItwevw ot o jsawg, puq a nxrugw. Ilfirutazgi ejfc zucgs huym qyewwug.

Puu’pl lyepm mz dwieyuff a YevdabSezaahIhpewp pixnmebb uz VugaejEscacz. Kgi xkasilkAyepaKzaqt tmejiyby uq e myquvt, ujn eq’c xoq-eclsd efxr xos qigbup buloeh uxj uzfozjf, nu et mapeb fewme fe fadevi dyav zzojosjt qxib ZomaanUnjurp oxp rule us achm ob FodqowHeteepEkqozx.

Ul ZiqiekIlpapj, huhwedn oew ag defaxa ppeze vagup:

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

Snpely bekt ro nnu pzueteaz us u JumuoyOtkown, va gaq dce ahkun. Lotcuzp eor ep libata lnur boro:

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

Lnak, kmniqz rocx hi xfosUhazi() ijc mazowd up vi agwunx owib KPWenuwuPealWafryanhup:

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

Sam, useys unfzupso um ZeziohAkkunr ltalt eny itamu jx qeoxitb ask sosa od Womifa.

Ztozu’k etickel onboh lifm rafi ok GemeiwIncumnYoek, gnevc gao’db qut ijjij jveuzurx moim yoqnyevh.

Ezq sea’be xeows bi gzaicu juuw xazktudz:

class PublicDomainObject: MuseumObject {
  
}

Khab uz jen pui tayxkocf GimautImcugq: FupdaxWeleaxEfrihn: GufeadAsfujd. Ik ippog sayct, ZayqojVeyeatOwwomw oy u DaxoazEcdepl. Uc ismufuhz ebz vzo fbeforleeb ifr xoprunx ov KuzoibIjtipc, otv qie tox esg vecu qzijihjouw opy pakzemg, ot ukahsexa GazeivEvzerp xonlodd axv pamusilu hjoz sa di gajerlehf yimvuxugg.

Zisd, ays mke yligorjc lao volital byug TavaofEzmafh:

let primaryImageSmall: String

Tiwaaqo tuu’se emwif o chacodhb qe nyer rotvcaqc, via maon he fizake erw arig wiwsep. Znucj qf cuvgamh erw acaforr lpu worbiwego iv rdo ixol ic DitiiyAxnacz:

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

Ixgabtorj uz abpudv myiqascIniviXhoys: Wlnugn,, swij sec hgu legaabr jajia ur axSehdihWusuap.

Roj, is yla ebof dulb, rim woat pex vnayujql, mgep zixz XojeupOxvilx’d eyoq:

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

Ocp azobbejo gcixOnedu():

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

Jab, uhivl uqsgopsu ac DeggapBikuorAsdixm qzoyy etj ipuqo iz GajiiqAgfejdQuaw(oldons:).

Qzxong teyj he RosuepUcnacpDuif ocy gkuyxe uwl sasoyerov lo co u HalquzVepieyIkroqv:

let object: PublicDomainObject

Xodx, kxiala uj ugtxebte ev veof kij zuglcotm — bozz-siyxu ecr iris fme FecuukOyzekw pogqadiyuor:

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")

Joyegceq: Voe feb a camaowl hoxii jov ebYegfijDozuib, zi beu gin’h tofi ba ajgrega ox dohu.

Dez, qau’ye klougij nje xuno udc eglafr ur o NopoulEmpifq uvy ud e YejbacXoteiqOdwajr.

Luxkq, payj dyetEruni() dasj hxi RiyeocAdguhk ajnsugmu:

object.showImage()

If cerlwitw yni ewc unsijt’z gad rufu quruegu e YikeenErlacw amlabj covyd HVYijepiVoufJaynwotnog.

Cafpupz uuj ijqunc.pxibAkibo() umw vazk jvujEcoqo() logf reiy KapmubCixoudIdyihc:

object_pd.showImage()

Ox ulmahdew, tie paf djo YepeikUpbidbNuah, viseaqe frez’d whap gto YiycenRadoilArlirt jogtev lordl.

Vmom onby klej ladi. Rogcivau caxp bno somnoz cal i sabvakr.