#33 瘋狂購物 App — UIStepper 和數字變字串練習

作業目的: 學習 UIStepper 和將數字變成畫面上的文字。

Stepper最大最小值以及每次點選增加數量可以調整

點選Stepper，Qty跟著改變

ulongTeaCount = Int(ulongTeaStepper.value)
lemonSodaCount = Int(lemonSodaStepper.value)
mangoSodaCount = Int(mangoSodaStepper.value)
lemonTeaCount = Int(lemonTeaStepper.value)
ulongTeaQtyLabel.text = String(ulongTeaCount)
lemonSodaQtyLabel.text = String(lemonSodaCount)
mangoSodaQtyLabel.text = String(mangoSodaCount)
lemonTeaQtyLabel.text = String(lemonTeaCount)

計算方式

//字串轉數字
let ulongTeaPrice = Float(ulongTeaPriceLabel.text!)!
let lemonSodaPrice = Float(lemonSodaPriceLabel.text!)!
let mangoSodaPrice = Float(mangoSodaPriceLabel.text!)!
let lemonTeaPrice = Float(lemonTeaPriceLabel.text!)!
let sum = ulongTeaPrice * Float(ulongTeaCount) + lemonSodaPrice * Float(lemonSodaCount) + mangoSodaPrice * Float(mangoSodaCount) + lemonTeaPrice * Float(lemonTeaCount)
//利用 NumberFormatter 顯示 Money
let formatter = NumberFormatter()
formatter.numberStyle = .currency
//數字轉字串
let moneyString = formatter.string(from: NSNumber(value: sum))
totalPriceLabel.text = "\(moneyString!)"

利用 NumberFormatter 顯示 Money

完整程式碼：

GitHub

GitHub - CheChenLiu/drinkShopApp

・參考資料

#11 瘋狂購物 App — UIStepper 和數字變字串練習

#51 防疫生鮮購物 App — UIStepper 和數字變字串