我开发了一个应用程序,其中有两个标签,两个pickerviews和一个分段的控制按钮,可在Imperial和Metric之间更改标签,并基于该标签,将在每个pickerview中加载不同的数组。目前,这一切正常。我遇到的问题是,由于每个pickerview都是一个体重和身高的数组,当用户按下分段的控制按钮以更改测量类型时,它将更改第二个数组的索引值。例如,如果我当前处于英制范围内,并且我选择了105(从100开始),如果我转换为公制,它将添加正确的数组,但是它会自动将我的起始数字增加5(索引之间的差值)数字和我从pickerview中选择的数字,反之亦然。
这是我的选择器代码:
@IBAction func selectorChoice(_ sender: Any) {
if selectorLabel.selectedSegmentIndex == 0 {
heightPicker.reloadAllComponents()
weightPicker.reloadAllComponents()
heightLabel.text = "Height (in)"
weightLabel.text = "Weight (lbs)"
weightInput.text = "100"
heightInput.text = "48"
UserDefaults.standard.set(selectorLabel.selectedSegmentIndex, forKey: "stateSelected")
UserDefaults.standard.set(heightLabel.text!, forKey: "height")
UserDefaults.standard.set(weightLabel.text!, forKey: "weight")
}
else if selectorLabel.selectedSegmentIndex == 1 {
heightPicker.reloadAllComponents()
weightPicker.reloadAllComponents()
heightLabel.text = "Height (cm)"
weightLabel.text = "Weight (kgs)"
weightInput.text = "45"
heightInput.text = "121"
UserDefaults.standard.set(selectorLabel.selectedSegmentIndex, forKey: "stateSelected")
UserDefaults.standard.set(heightLabel.text!, forKey: "height")
UserDefaults.standard.set(weightLabel.text!, forKey: "weight")
}
}
Pickerview代码:
var height = (48...96).map(String.init)
var weight = (100...350).map(String.init)
var heightCM = (121...244).map(String.init)
var weightKG = (45...159).map(String.init)
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
var countrows : Int = height.count
if pickerView == weightPicker && weightLabel.text == "Weight (lbs)" {
countrows = self.weight.count
}
else if pickerView == weightPicker && weightLabel.text == "Weight (kgs)"
{
countrows = self.weightKG.count
}
return countrows
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if weightLabel.text == "Weight (lbs)" {
if pickerView == heightPicker {
let titleRow = height[row]
return titleRow
} else if pickerView == weightPicker {
let titleRow = weight[row]
return titleRow
}
return ""
} else if weightLabel.text == "Weight (kgs)" {
if pickerView == heightPicker {
let titleRow = heightCM[row]
return titleRow
}
else if pickerView == weightPicker {
let titleRow = weightKG[row]
return titleRow
}
return ""
}
return ""
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
if pickerView == heightPicker && heightLabel.text == "Height (in)" {
self.heightInput.text = self.height[row]
}
else if pickerView == weightPicker && weightLabel.text == "Weight (lbs)" {
self.weightInput.text = self.weight[row]
}
else if pickerView == heightPicker && heightLabel.text == "Height (cm)" {
self.heightInput.text = self.heightCM[row]
}
if pickerView == weightPicker && weightLabel.text == "Weight (kgs)" {
self.weightInput.text = self.weightKG[row]
}
}
答案 0 :(得分:1)
每次切换分段控件时,您都可以尝试重新加载组件并重置为数组中的第一个元素:
@IBAction func segmented(_ sender: UISegmentedControl) {
if sender.selectedSegmentIndex == 0 {
heightLabel.text = "Height (in)"
weightLabel.text = "Weight (lbs)"
} else {
heightLabel.text = "Height (cm)"
weightLabel.text = "Weight (kgs)"
}
heightPicker.reloadAllComponents()
weightPicker.reloadAllComponents()
heightPicker.selectRow(0, inComponent: 0, animated: true)
weightPicker.selectRow(0, inComponent: 0, animated: true)
}