如何动态添加选择器

Question

我的屏幕上有一个按钮,当我按下按钮时,我想要一个选择器显示一个项目列表,当选择一个项目时,按钮的文本应该更改为那个,选择器应该消失.

这是我的代码:

Picker picker = new Picker
    {
        Title = "What's in the slot?",
        VerticalOptions = LayoutOptions.CenterAndExpand
        //HorizontalOptions = LayoutOptions.Center 

    };

按下按钮时调用的函数:

private void Displaypickerview(int row, int column)
    {
        if (status == "filling board")
        {
            foreach (string text in pickerText)
            {
                picker.Items.Add(text);
            }
            foreach (string ore in oreLevels)
            {
                picker.Items.Add(ore);
            }


            picker.SelectedIndexChanged += (sender, args) =>
            {
                if (picker.SelectedIndex == -1)
                {

                }
                else
                {
                    //change value of cell and button
                    Picker picker = (Picker)sender;
                    int index = picker.SelectedIndex;

                    if (index < pickerText.Length)
                    {
                        board[row, column].Text = pickerText[index - 1];
                    }
                    else {
                        board[row, column].Text = oreLevels[index - 1 - pickerText.Length];
                    }
                }
            };
        }
        else if (status == "choosing item")
        {

        }

    }

但我不知道我应该如何渲染屏幕上的选择器视图并在之后将其删除.

更新:

下图中完成按钮的事件处理程序是什么.

Answer 1

您可以通过将选择器添加到集合中来将拾取器添加到您Grid或Panel您正在使用的任何内容中Children:

Grid.SetRow(picker, 0); //first row
Grid.SetColumn(picker, 0); //first column
grid.Children.Add(picker);

同样,您可以通过从Children集合中删除它来删除它:

grid.Children.Remove(picker);