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、两个选择器视图和一个分段控制按钮，可在英制和公制之间更改标签，并根据该标签在每个选择器视图中加载不同的数组。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 select 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（我的起始号码与我从 pickerview select 编辑的号码之间的差异，反之亦然。

这是我的select或代码：

@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")
        }
    }

选择器视图代码：

    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

您可以尝试在每次切换分段控件时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)
}

尝试重新加载 pickerview 的所有数据不起作用

Trying to reload all data for pickerview not working

xcode

uipickerview

swift