swift - 尝试重新加载 pickerview 的所有数据不起作用

Question

我开发了一个应用程序，其中有两个标签、两个选择器 View 和一个分段控制按钮，用于在英制和公制之间更改标签，并根据该标签在每个选择器 View 中加载不同的数组。目前这一切都有效。我遇到的问题是因为每个 pickerview 都是一个重量和高度数组，当用户按下分段控制按钮更改测量类型时，它会更改第二个数组的索引值。例如，如果我目前使用的是英制，并且我选择 105(从 100 开始)，如果我切换到公制，它会添加正确的数组，但它会自动将我的起始数字增加索引 5(我的起始数字之间的差异数字和我从 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")
        }
    }

选择器 View 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]

        }
    }

Answer 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)
}