Xamarin- frame.gesturreerecognizers在轻拍时不起作用

Question

我有一个Xamarin项目，可以查看产品的详细信息。我有两个按钮可以增加或减少产品的数量。为了显示它如何更改，我有一个名为lblquantity的标签，该标签显示数量，如果您点击删除或添加按钮，则会更新。

要有一些上下文，这是视图

问题是lblquantity没有自行更新。我以前有一个带有堆叠式的视图，手势识别器效果很好。现在，它甚至都不进入该方法。

这是XAML

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:controls="clr-namespace:AppCrijoya.Controls"
             x:Class="AppCrijoya.Views.ProductDetailPage">

    <ScrollView>

        <StackLayout VerticalOptions="FillAndExpand" BackgroundColor="White" Spacing="0" Margin="0" Padding="0">
            <Grid BackgroundColor="White" RowSpacing="0">
                <Grid.RowDefinitions>
                    <RowDefinition Height="auto" />
                    <RowDefinition Height="auto" />
                </Grid.RowDefinitions>

                <!-- 1. Profile picture-->

                <Frame HasShadow="True" Margin="10" CornerRadius="20">
                    <Image x:Name="ProductImage" Aspect="AspectFit" Grid.Row="0" Margin="0" VerticalOptions="Start" HeightRequest="230"/>
                </Frame>
                <!-- Here add the code that is being explained in the next block-->
                <StackLayout  HeightRequest="90" Grid.Row="1" BackgroundColor="Transparent" VerticalOptions="Start">

                    <StackLayout Padding="20" BackgroundColor="Transparent">
                        <!-- Here add the code that is being explained in the next block-->
                        <!-- Blocks: 3 and 4 -->
                        <Grid Padding="25,5,25,0" RowSpacing="0">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="*"/>
                                <ColumnDefinition Width="*"/>
                                <ColumnDefinition Width="auto"/>
                                <ColumnDefinition Width="30"/>
                                <ColumnDefinition Width="auto"/>
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto"/>
                                <RowDefinition Height="Auto"/>
                                <RowDefinition Height="Auto"/>
                                <RowDefinition Height="Auto"/>
                                <RowDefinition Height="80"/>
                            </Grid.RowDefinitions>

                            <!-- Here add the code that is being explained in the next block-->
                            <!-- 4. Contact information-->
                            <Label x:Name="txtName" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="4" FontAttributes="Bold" FontSize="30" TextColor="Black"/>
                            <Label x:Name="txtDescription" Grid.Row="1" Grid.ColumnSpan="4" TextColor="Black" FontSize="16"/>
                            <Label Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="4" Padding="0,10,0,0" FontSize="16">
                                <Label.FormattedText>
                                    <FormattedString>
                                        <Span Text="Stock: " FontAttributes="Bold" TextColor="Black"/>
                                        <Span x:Name="txtDetails" TextColor="black"/>
                                    </FormattedString>
                                </Label.FormattedText>
                            </Label>
                            <!--4. Contact information: Board inforation-->
                            <Label Grid.Row="2" Grid.Column="2" Grid.ColumnSpan="3" Text="Quantity" FontAttributes="Bold" Style="{StaticResource stlBoardTitle}" />

                            <Frame  Grid.Column="2" Grid.Row="3" Style="{StaticResource stkCart}">
                                <Frame.GestureRecognizers>
                                    <TapGestureRecognizer x:Name="RemoveTap" Tapped="RemoveTap_Tapped"/>
                                </Frame.GestureRecognizers>
                                <Label Text="-" Style="{StaticResource lblCart}"/>
                            </Frame>

                            <StackLayout Grid.Column="3" Grid.Row="3"  HeightRequest="40" VerticalOptions="Center" >
                                <Label 
                                   x:Name="lblQuantity" 
                                   Text="1" 
                                   FontSize="17"
                                   TextColor="Black"
                                   HorizontalTextAlignment="Center" 
                                   VerticalTextAlignment="Center" 
                                   HeightRequest="40"/>
                            </StackLayout>

                            <Frame Grid.Column="4" Grid.Row="3" Style="{StaticResource stkCart}">
                                <Frame.GestureRecognizers>
                                    <TapGestureRecognizer x:Name="AddTap" Tapped="AddTap_Tapped"/>
                                </Frame.GestureRecognizers>
                                <Label Text="+" Style="{StaticResource lblCart}"/>
                            </Frame>

                        </Grid>

                    </StackLayout>
                </StackLayout>

            </Grid>
            <controls:MyFrame HasShadow="true" HeightRequest="80" BackgroundColor="#e5d3c2" VerticalOptions="EndAndExpand">
                <StackLayout WidthRequest="20" VerticalOptions="Center">
                    <Grid ColumnSpacing="0">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*"/>
                            <ColumnDefinition Width="auto"/>
                        </Grid.ColumnDefinitions>
                        <Label
                            x:Name="txtPrice"
                            Grid.Column="0"
                            HorizontalTextAlignment="End"
                            TextColor="White"
                            HorizontalOptions="Center"
                            VerticalOptions="Center"
                            FontAttributes="Bold"
                            FontSize="25"
                            />
                        <Button CornerRadius="30" 
                        x:Name="btnAddToCart"
                        Clicked="BtnAddToCart_Clicked"
                        Grid.Column="2"
                        TextColor="Black" 
                        Text="Añadir al carrito" 
                        BackgroundColor="White"
                        Style="{StaticResource btn}" 
                        FontAttributes="Bold" 
                        />
                    </Grid>
                </StackLayout>
            </controls:MyFrame>

        </StackLayout>

    </ScrollView>
</ContentPage>

这是我知道工作正常工作的添加和删除方法，

private void RemoveTap_Tapped(object sender, EventArgs e)
        {
            int quantity = Convert.ToInt32(lblQuantity.Text);

            if (quantity > 1)
            {
                quantity -= 1;
            }

            lblQuantity.Text = quantity.ToString();
        }
        private void AddTap_Tapped(object sender, EventArgs e)
        {
            int quantity = Convert.ToInt32(lblQuantity.Text);
            quantity += 1;
            lblQuantity.Text = quantity.ToString();
        }

标签的文本已被更改为更改，但事实并非如此。正如我所说，它甚至没有进入该方法。

我不知道有什么问题。请帮忙，谢谢。

编辑

我尝试将其更改为按钮，但仍然不起作用。我认为网格可能是一个问题，但我仍然不知道。

Answer 1

我通过确保在堆叠式内部没有以前没有的框架来解决问题，

这是可以解释它的图像

要添加或删除的帧不在红色stacklayout中手势识别器无能为力。我只是给了它更高的高度，并将方面设置为fillandexpand