arrays - pickerview 中的条件或 if 语句

Question

我确实需要帮助来制定这里的逻辑，所以我在 UIPickerView 中使用了 3 个不同的数组。当用户在 pickerview 中选择类似的内容时，应该执行某个公式(与它无关)我应该用什么？ if 语句？转变？还有一个问题。用作字符串的shiftCount数组数据会有问题吗？因为我需要将公式乘以 *1 或 *2 等。

   var shiftCount = [
   "1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25"]

   var Level = [
       "White","Silver 80%","Silver 100%","Gold 80%","Gold 100%","Diamond 80%","Diamond 100%",]

   var shiftDay = [

   "MNG","LMNG","AFT","LAFT","PEAK","LNGT","NGT"]

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {


        switch (component) {
        case 0:
            MyShifts = shiftCount[row]
            shifts.text = "How many shifts: " + MyShifts
            print(MyShifts)
        case 1:
            MyShiftType = shiftDay[row]
            shiftType.text = "Shift you work: " + MyShiftType
            print(MyShiftType)
        case 2:
            MyLevel = Level[row]
            level.text = "Your Level: " + MyLevel
            print(MyLevel)
        default:
            break
        } 

Answer 1

当您只有两个选项需要评估时，建议使用 if 语句，因此在这种情况下， switch 语句是可以的，关于您想应用公式时关于字符串数组的第二个问题，它不会出现问题是一个问题，但是你需要将该字符串转换为 Int、Double、Float 或任何类型你需要进行数学计算，如果你想在标签或类似的东西上显示它，你可以进行字符串插值来展示它。