入口单元格失去对 xamarin 表单中按钮按下的关注

Question

我有一些按钮，当按下它时就像键盘一样，它必须填充一个聚焦的输入字段。但它不起作用，因为按下按钮会导致条目失去焦点。谁能给我一个解决这个问题的提示？    private void Button_Clicked(object sender, EventArgs e)    {   Button button = (Button)sender;        string pressed = button.Text;        if (this.FirstDigit.IsFocused)        {            this.FirstDigit.Text += pressed;        }and so on ...

Answer 1

我发现单击按钮时很难保持条目的焦点。

我给你写了一个WorkAroud，当词条是 的时候Unfocused，用apreviousEntry记录这个词条：

public partial class MainPage : ContentPage

{

    public Entry previousEntry;

    public MainPage()

    {

        InitializeComponent();

        first.Unfocused += (object sender, FocusEventArgs e) => {

            previousEntry = (Entry)sender;

        };

        second.Unfocused += (object sender, FocusEventArgs e) => {

            previousEntry = (Entry)sender;

        };

        third.Unfocused += (object sender, FocusEventArgs e) => {

            previousEntry = (Entry)sender;

        };

    }

    private void Button_Clicked(object sender, EventArgs e)

    {

        Button button = (Button)sender;

        string pressed = button.Text;

        if (previousEntry != null)

        {

            previousEntry.Text += pressed;

        }

    }    

}

在Xaml中：

<StackLayout>

    <!-- Place new controls here -->

    <Button Text="click me" Clicked="Button_Clicked"  HorizontalOptions="Center" VerticalOptions="CenterAndExpand"/>

    <Entry x:Name="first" Text="1+" HorizontalOptions="Center" VerticalOptions="CenterAndExpand"/>

    <Entry x:Name="second" Text="2+" HorizontalOptions="Center" VerticalOptions="CenterAndExpand"/>

    <Entry x:Name="third" Text="3+" HorizontalOptions="Center" VerticalOptions="CenterAndExpand"/>

</StackLayout>

让我知道它是否有效。

Answer 2

我会打电话

entry.Focus();

用那种方法让它工作。