我在 github Github 链接上创建了一个示例
当单击一行或尝试在 UIPickerView 中滚动时,它会崩溃,我想知道为什么。
// create a ActionSheet
var actionPickerSheet = new UIActionSheet("Select a Category");
actionPickerSheet.Style = UIActionSheetStyle.BlackTranslucent;
// Create UIpickerView
var catPicker = new UIPickerView(){
Model = new catPickerModel(),
AutosizesSubviews = true,
Hidden = false,
ShowSelectionIndicator = true
};
// show inside view and add the catPicker as subView
actionPickerSheet.ShowInView(View);
actionPickerSheet.AddSubview(catPicker);
// resize both views so it fits smoothly
actionPickerSheet.Frame = new RectangleF(0,100,320,500);
catPicker.Frame = new RectangleF(actionPickerSheet.Frame.X,actionPickerSheet.Frame.Y-25,actionPickerSheet.Frame.Width, 216);
和模型
private class catPickerModel : UIPickerViewModel
{
public string[] protocolNames = new string[]
{
"Web", "Phone Call", "Google Maps", "SMS", "Email"
};
public override int GetComponentCount(UIPickerView uipv)
{
return 1;
}
public override int GetRowsInComponent( UIPickerView uipv, int comp)
{
//each component has its own count.
int rows = protocolNames.Length;
return(rows);
}
public override string GetTitle(UIPickerView uipv, int row, int comp)
{
//each component would get its own title.
return protocolNames[row];
}
public override void Selected(UIPickerView uipv, int row, int comp)
{
Console.WriteLine("selected:" + row);
}
public override float GetComponentWidth(UIPickerView uipv, int comp)
{
return 300f;
}
}
我不知道为什么它会一直崩溃,是模型中缺少某种方法还是我试图以错误的方式做到这一点?
谢谢