100 days of swiftui: checkpoint 6
https://www.hackingwithswift.com/quick-start/beginners/checkpoint-6
challenge
create a struct to store information about a car, including its model, number of seats, and current gear, then add a method to change gears up or down. Have a think about variables and access control: what data should be a variable rather than a constant, and what data should be exposed publicly? Should the gear-changing method validate its input somehow?
solution
struct Car {
let model: String
let seatCount: Int
private var currentGear = 0
init(model: String, seatCount: Int) {
self.model = model
self.seatCount = seatCount
print("Initial gear is 0.")
}
mutating func changeGear(isUp: Bool) {
if isUp {
if currentGear == 10 {
print("You can't change gear up. This is maximum!")
} else {
currentGear += 1
print("Now current gear is \(currentGear)!")
}
} else {
if currentGear == 0 {
print("You can't change gear down. This is manimum!")
} else {
currentGear -= 1
print("Now current gear is \(currentGear)!")
}
}
}
}- 차의 모델이나 좌석 수는 변경되지 않으니 let으로 설정했다.
- 기어는 처음에 0으로 설정하고 changegear를 통해 한 단계씩 변경할 수 있도록 private를 이용했다.
- 그리고 기어가 최소이거나 최대일 때 더이상 기어의 가능한 범위를 벗어나지 않도록 조건문을 사용해서 경고문을 print한다.
var newCar = Car(model: "bmw something", seatCount: 4)
newCar.changeGear(isUp: false)
newCar.changeGear(isUp: true)결과:
Initial gear is 0.
You can't change gear down. This is manimum!
Now current gear is 1!코드 파일
https://github.com/soaringwave/Ios-studying/commit/d5691ec51d719a5cc159c26b38e0ab61d6024bcd
3개의 댓글
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