ios - 在 UIPickerView Swift 中更改选定值的颜色

Question

我有 UIPickerView 使用名称数组显示名称

数组的第一个元素是默认值“Select Name”

我想用加里色显示选定的值，用蓝色显示其余名称

此函数用于防止选择默认值:

func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    if row == 0 {
        pickerView.selectRow(row+1, inComponent: component, animated: true)
        selectedName = names[row+1]
    } else {
        selectedName = names[row]
    }
}

这个函数可以改变颜色

func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView?) -> UIView {
    let pickerLabel = UILabel()
    pickerLabel.textColor = (row == pickerView.selectedRowInComponent(component)) ? UIColor.grayColor() : UIColor.blueColor()
    pickerLabel.text = names[row].name
    pickerLabel.textAlignment = NSTextAlignment.Center
    return pickerLabel
}

问题是当我选择选择器的第一个值(不是默认值)时，颜色仍然是蓝色。所有其他项目都正常工作(当我选择它们时它们的颜色变为灰色)

Answer 1

Use the PickerView reloadComponentMethod

func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        if row == 0 {
            pickerView.selectRow(row+1, inComponent: component, animated: true)
            pickerView.reloadComponent(component)
            selectedName = names[row+1]
        }
        else {
            selectedName = names[row]
        }
    }

selectRow 只会将滚轮旋转到新行。调用 reloadComponent 刷新数据源以获取新 View