选择 DatePicker 的默认值 Swift 4

Question

我在使用 DataPicker 时遇到一些问题：如何在 DatePicker 中选择所需的值。示例：已经选择了“1 ITEM”，需要按按钮选择“2 ITEM”。需要选择项目 [index+1]，我该怎么做？

func numberOfItemsInPickerView(_ pickerView: AKPickerView) -> Int {

        switch pickerView {
        case yearPickerView:
            return defaultDataSample.years.count
        case monthPickerView:
            return defaultDataSample.months.count
        case quaterPickerView:
            return defaultDataSample.quaters.count
        default:
            return 0
        }
    }

    func pickerView(_ pickerView: AKPickerView, titleForItem item: Int) -> String {

        switch pickerView {
        case yearPickerView:
            return defaultDataSample.years[item]
        case monthPickerView:
            return defaultDataSample.months[item]
        case quaterPickerView:
            return defaultDataSample.quaters[item]
        default:
            return ""
        }

    }

    func pickerView(_ pickerView: AKPickerView, didSelectItem item: Int) {

        switch pickerView {
        case yearPickerView:
            finantialDataSample.currentYear = Int(defaultDataSample.years[item])

        case monthPickerView:
            finantialDataSample.period = defaultDataSample.months[item]

        case quaterPickerView:
            finantialDataSample.period = defaultDataSample.quaters[item]

        default:
            break
        }

Answer 1

只需设置一个变量来记住选择的最后一行，然后移动到下一行。

var currentRow = 0
func pickerView(_ pickerView: AKPickerView, didSelectItem item: Int) {
    switch pickerView {
         case yearPickerView:
            currentRow = item
         default:
            break
    }
}

func buttonaction() { //Button triggers this
      let nextRow = currentRow + 1
      pickerview.selectRow(nextRow, inComponent: 0, animated: true)
}

如果这对您不起作用，请告诉我。

尼尔

选择 DatePicker 的默认值 Swift 4

Pick default value of DataPicker Swift 4

ios

swift

uipickerview