Ixazululiwe: indilinga

I-Swift Programming kanye Nomqondo Womjikelezo - Ukuhlaziywa Okujulile

Uhlelo lwe-Swift, umdlali owaziwayo enkundleni yokuthuthukiswa kohlelo lokusebenza, lwaziwa ngezici zalo ezisheshayo, zesimanjemanje, eziphephile, nezisebenzisanayo. Enye yezindima ezibalulekile ze-Swift ezinhlelweni ukufaneleka kwayo ekwenzeni lula imisebenzi eyinkimbinkimbi efana nokukhohlisa umumo, ikakhulukazi imibuthano. Kulolu phenyo, sizocubungula isixazululo esibanzi sokubhekana nemibuthano ye-Swift, sihlole incazelo yekhodi ngesinyathelo ngesinyathelo, futhi sigqamise imitapo yolwazi noma imisebenzi ehilelekile kule nqubo noma ukufana kwayo.

Ukudweba Umbuthano ku-Swift

I-Swift yenze kwaba lula ukudweba izimo eziyinkimbinkimbi, okuyenza ingeneke ngisho nakubasebenzisi abasha. Lapho udweba umbuthano ku-Swift, isigaba esivamile okufanele sisetshenziswe yi-UIBezierPath. Leli klasi likuvumela ukuthi uchaze indlela ehlanganisa amasegimenti omugqa oqondile nogobile, onganikezwa ngokubuka kwakho.

Isigaba se-UIBezierPath siyisibonelo sendlela echaza i-api kusukela kuhlaka lwe-UIKit. Inikeza indlela esebenziseka kalula kakhulu yokuchaza nokunikeza izimo. I-UIBezierPath ingadweba noma yini ukusuka emugqeni oqondile, i-arc iye kumbuthano wonke. Ku-UIBezierPath, isiyingi siyadwetshwa sicacisa unxande futhi indlela isebenzisa i-arc efanayo kuwo wonke amakhona, kwakheka indilinga ngempumelelo.

let circle = UIBezierPath(arcCenter: CGPoint(x: frame.size.width / 2, y: frame.size.height / 2), radius: (frame.size.width - 1)/2, startAngle: 0, endAngle: CGFloat(Double.pi * 2), clockwise: true)
 
let shapeLayer = CAShapeLayer()
shapeLayer.path = circle.cgPath

Ukufaka umbala kumbuthano

Ngemva kokudala umbuthano, kuwumkhuba ovamile ukuwugcwalisa ngombala. Lokhu kuma njengenqubo yenqubo lapho kufanele usebenzise isigaba se-UIColor. Ikilasi le-UIColor, eliphinde libe yilungu lohlaka lwe-UIKit, lisiza ukucaciswa kwemibala ezintweni ezinemifanekiso. Ihlanganisa izinto ezinemibala echazwe ngaphambilini zemibala yomhlaba wangempela futhi ivumela ukudalwa kwemibala yangokwezifiso kusetshenziswa amamodeli emibala ehlukene.

shapeLayer.fillColor = UIColor.red.cgColor
shapeLayer.strokeColor = UIColor.black.cgColor

Ukuthuthukisa Ukubukeka Kombuthano

Ukusetha ukubukeka kwesithombe esifana nesendlalelo kuza ngokulandelayo. Kulapho ezinye izimo ezifana ne-CALayer zidlala khona indima ebalulekile. Isigaba se-CALayer siyisibonelo esivela kuhlaka lwe-QuartzCore. Iphatha okuqukethwe okusekelwe ezithombeni futhi ivumela ukwenza opopayi kulokho okuqukethwe. Ukusetha izichasiso ezifana nokuthi `lineWidth` kanye `ne-strokeEnd` kusiza ukwakha ukubukeka.

shapeLayer.lineWidth = 1
shapeLayer.strokeEnd = 0.5
self.layer.addSublayer(shapeLayer)

I-Swift, ngendlela yayo enembile ekudwebeni izimo, ithuthukisa ukubukeka kwayo, nokubaveza ngemibala egqamile, abahleli bezinhlelo zezipho ukunethezeka okungaqediwe kokwenziwa. Imitapo yolwazi efana ne-UIBezierPath, UIColor, kanye ne-CALayer, idlala indima ehlanganyelwe kodwa ebalulekile ekudwebeni, ekugcwaliseni, nasekugqwayizeni imifanekiso. Ngokuqonda lawa mamitapo abalulekile, umsebenzi wokudweba izimo ku-Swift kuzoba inqubo eqonde phambili, okuvumela ukuthuthuka okubalulekile kuzithombe zohlelo lokusebenza kanye ne-GUI.

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