ios - Swift - 如何连接来自 UIPickerView 的 didSelectRow 选择

Question

我有一个两列选择器(英里和十分之一)

选择器似乎运行良好，但我似乎无法弄清楚如何连接两列的选择，即如果用户从第一列选择 23，从第二列选择 6，我想创建一个答案“23.6”

目前，任一列选择都会覆盖之前的选择。

顺便说一句:我不认为我可以附加两个字符串，因为如果用户先选择 10ths 会发生什么？

    let resetPickerData = [Array(0...99), Array(0...9)]

// returns the number of 'columns' to display.
func numberOfComponentsInPickerView(pickerView: UIPickerView!) -> Int{
    return 2
}

// returns the # of rows in each component..
func pickerView(pickerView: UIPickerView!, numberOfRowsInComponent component: Int) -> Int{
    return resetPickerData[component].count
}

func pickerView(pickerView: UIPickerView!, titleForRow row: Int, forComponent component: Int) -> String! {
    return String(resetPickerData[component][row])
}

func pickerView(pickerView: UIPickerView!, didSelectRow row: Int, inComponent component: Int)
{
    //var distance = ??
}

Answer 1

您需要像这样单独跟踪组件选择，然后连接字符串:

var firstComponentString = ""
var secondCompoentString = ""

func pickerView(pickerView: UIPickerView!, didSelectRow row: Int, inComponent component: Int)
{
    if component == 0 {
        firstComponentString = String(resetPickerData[component][row])
    }
    else  if component == 1 {
        secondCompoentString = String(resetPickerData[component][row])
    }

    var displayString = "\(firstComponentString).\(secondCompoentString)"
}