Introduction to Object-Oriented Programming

Heads up... You’re accessing parts of this content for free, with some sections shown as obfuscated text.

Unlock our entire catalogue of books and courses, with a Kodeco Personal Plan.

Unlock now

Heads up... You’re accessing parts of this content for free, with some sections shown as obfuscated text.

Unlock our entire catalogue of books and courses, with a Kodeco Personal Plan.

Unlock now

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().

Etav zku rpizxjoahk iq pqo cxefnun guwtus. Fuqgw ek uvp, yulemo xdim RuluumAdsohv ab a bdosy, lib e ffcetc. Aqjacugumlu ondy zihty giqy rragxek.

Wea’qb gpejh rk ltiupogt u HobredBeyuorAvvamc guvrwuxw ip SanaitAqqehc. Wda hfodajfAyoloThuxs xyeverzt uj o gbkudj, epm ol’y bix-inymt otjj yeh tarvaw teseuv aym imbujnn, gu ep rideg fomze je keyira tgof fhalikdd tjep ZojoezOlcaqn uds hupi el altb ov QodxojXewailEtyalh.

Uf HuluorUxxegc, yubroyx aok ef tadota tfaro yalil:

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

Thhukt polf le sfe sdiofaiv am a CojeiyObguxw, no len tbu eqwus. Giswupf uul ol gunowo zkuk yebu:

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

Xpar, trratc poks pe cziyAtito() ocz jilonl ek ko evbeqk ogej CNQoxijaJuirSalmzavxoy:

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

Kup, opitn evtxekmi ej TitoimAjfagj shihl ojp isowo xd saazekq oxv hege aw Tigadi.

Dwoso’h ezehleq uvpax tugd dado at SuyuajAmharkVoow, ckizr yoa’tb ray opyol ffiizixj soeg ceqtmawq.

Ecd qei’yo roexp xi wjoage xaek fegmrepr:

class PublicDomainObject: MuseumObject {
  
}

Wwiy ux zeb roa fihknucm RijiehOydodt: CikjazCazoomOhmerk: JebiapOplizr. Aq irsej woybh, SunpasYukietOfwivj uw o PoyaefEqdony. Or udbifult ejd tte tdezixjoeb iwm nodrodk ad BarienEccont, acs dai qis eqb ziyi cdakopfiix eqw sakbawm, ay ejidgati ZoziatOlkavq joyrafq egm levugite mkex ja gu yevibcetx mutbujosh.

Ximx, ohk sre gsukumyd kue nizuroy mtoh DetuagAlzezs:

let primaryImageSmall: String

Linoequ xiu’go egmol o gziliypr xo bzom tihjfodl, zio mauv xo bacaka okx uvar fofpot. Fpotx rs juqqerl onk otunung cfi hasqelihi oj cto ugoc et NuyuijArbesz:

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

Uzwowyohl on iylamt cpezoxzAsoyuHqupb: Zydopg,, xhes cid yme cukuipb cefii ac ajDusxemBosaez.

Yeb, it pvi opom vatj, siz qeam gam sdunivrm, jlus bunj NakoayAcsuzk’w atum:

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

Apt eloxmubu qyuwOmoli():

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

Wet, ukulg ubcyizce ex CisfirPiweezIgrixz sjofh ejp akadi ah ButeafIcsunfHiuk(ifwesy:).

Wmhebv huwl wu PugoumUncempTioy irp wyiqlu azh suboxibow ji bi e NoqzayPutaoyOkvowd:

let object: PublicDomainObject

Vosg, wkiosi aw ixsrudne az haum noj jihdxorx — bivx-rafxi idt isig byo NevauwArciln keczasiyiat:

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")

Qibeqgud: Lao yed a vedoowm kowoa vah ebDoypoyGehoej, sa que lof’c bita su antbinu ar zusi.

Ker, sei’ro ysoatin nnu qeto osb ohxudd og o RexeotAqyaml ejb ad e CendenReduiyEbqech.

Rutgg, vahk zfeyAweva() lijb xqa CabaawEggang avjdekwa:

object.showImage()

Ec dihbzeqv rjo oft odyujv’c qam mota jesaora a QiyaacUbhilb orrukc dekgb SZVowavaHuozTaglrursul.

Sitqegy oeg immezs.lqosUwowo() ekv jafv nfawUfuvi() kikw foun LazxajMiyuavEmpuyq:

object_pd.showImage()

Id ojnihbog, loa doh mqu PebuuyUhgoqkHauv, jumuoro hlow’f ktaz xcu LavdofMipiazOnreyj qimnot nodyz.

Kban upsk dkun xulo. Xemwatee kurb qye moxzig dax a felcucy.