在另一個按鈕的單擊事件中如何訪問一個按鈕的發送者對象

Question

我正在使用Xamarin.Forms，並且ListView中有兩個按鈕，它們被視為單選按鈕。 在單擊事件中，我正在更改按鈕的圖像屬性，以便它可以用作單選按鈕。 但就我而言，我需要一次選擇一個按鈕。 如果用戶單擊一個單選按鈕，則另一個單選按鈕應自動重置，以便一次只能選擇一個按鈕。 我在這里共享ListView的代碼-

<ListView RowHeight="35"  SeparatorVisibility="None" BackgroundColor="{x:Static color:ColorResources.PageBackgroundColor}" HeightRequest="230" x:Name="listof_ingredients_and_lifestyleDiets">
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <ViewCell>
                           <StackLayout Spacing="60" HorizontalOptions="FillAndExpand" Orientation="Horizontal">                           
                                <Label  Text="dipak" FontSize="14"  TextColor="{x:Static color:ColorResources.TextColor}" HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand"/> 
                                <Button Image="radio_Check.png" Clicked="OnAllergenTapped"   HeightRequest="25" WidthRequest="25" HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand"/>
                                <Button Image="radio_unCheck.png" Clicked="OnPreferenceTapped"   HeightRequest="25" WidthRequest="25" HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand"/>
                                <Button Image="deleteBtn.png" Clicked="btnDeleteClicked" HeightRequest="50" WidthRequest="40" HorizontalOptions="EndAndExpand" VerticalOptions="CenterAndExpand"/>
                           </StackLayout>
                       </ViewCell>
                    </DataTemplate>
                </ListView.ItemTemplate>
       </ListView>

單選按鈕后面的代碼也位於此處-

public void OnAllergenTapped(object sender, EventArgs e)
{
    var s = sender as Button;
    if (flag_allergen == 1)
    {
        s.Image = "radio_uncheck.png";
        flag_allergen = 0;
        flag_preference = 1;
    }
    else
    {
        s.Image = "radio_Check.png";
        flag_allergen = 1;
        flag_preference = 0;
    }
}
public void OnPreferenceTapped(object sender, EventArgs e)
{
    var s = sender as Button;
    if (flag_allergen == 1)
    {
        s.Image = "radio_uncheck.png";
        flag_allergen = 0;
        flag_preference = 1;
    }
    else
    {
        s.Image = "radio_Check.png";
        flag_allergen = 1;
        flag_preference = 0;
    }
}    

我在上述方法中使用的邏輯對我來說沒有任何意義，因為它允許我同時單擊兩個按鈕。 一次選擇一個按鈕需要進行哪些更改？

Answer 1

我這樣自己解決了問題-

Button btnPreference;
        public void OnAllergenTapped(object sender, EventArgs e)
        {
            var allergen = sender as Button;
            if(flag_allergen==1){
                allergen.Image="radio_uncheck.png";
                btnPreference = allergen.Parent.FindByName<Button> ("btnPreference");
                btnPreference.Image = "radio_Check.png";
                flag_allergen=0;
                flag_preference=1;
            }else{
                allergen.Image = "radio_Check.png";
                btnPreference.Image = "radio_uncheck.png";
                flag_allergen=1;
                flag_preference=0; 
            }
            Debug.WriteLine ("Allergen="+flag_allergen+"  Preference= "+flag_preference  );
        }