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@JoeM-RP

JoeM-RP/DemoModel.cs Secret

Created Sep 1, 2020
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public class DemoModel : UIPickerViewModel
{
public Dictionary<string, string[]> options = new Dictionary<string, string[]>()
{
{ "America", new string[] { "Mexico", "USA" } },
{ "Europe", new string[] { "Germany", "France", "Italy"} },
{ "Asia", new string[] { "Korea", "Japan"} },
};
public override nint GetComponentCount(UIPickerView pickerView) => 2; // This determines how many columns are rendered
public override nfloat GetComponentWidth(UIPickerView picker, nint component) => component == 0 ? 120f : 160f;
public override nfloat GetRowHeight(UIPickerView picker, nint component) => 40f;
/// <summary>
/// Determines the number of rows to render in a component
/// </summary>
public override nint GetRowsInComponent(UIPickerView pickerView, nint component)
{
if (component == 0)
return options.Keys.Count;
else
{
var driver = pickerView.SelectedRowInComponent(0);
return options.Values.ElementAt((int)driver).Length;
}
}
/// <summary>
/// Gets the display value for a row in a component
/// </summary>
public override string GetTitle(UIPickerView pickerView, nint row, nint component)
{
if (component == 0)
return options.Keys.ElementAt((int)row);
else
{
var driver = pickerView.SelectedRowInComponent(0);
return options.Values.ElementAt((int)driver).ElementAt((int)row);
}
}
[Export("pickerView:didSelectRow:inComponent:")]
public override void Selected(UIPickerView pickerView, nint row, nint component)
{
// Update the display for column 2 if the value of column 1 has changed
if (component == 0)
{
pickerView.ReloadComponent(1);
pickerView.Select(0, 1, false);
}
}
}
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