我使用扩展器制作了ContentView。我想在另一个Xaml文件中多次重复此Xaml代码。但是我想为每个扩展器都设置不同的绑定。我链接了此代码(ContentView代码):
<?xml version="1.0" encoding="UTF-8"?>
<ContentView xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:expandable="clr-namespace:Expandable;assembly=ExpandableView"
x:Class="Hello.ExpandableView">
<ContentView.Content>
<expandable:ExpandableView Padding="5">
<expandable:ExpandableView.PrimaryView>
<Frame BackgroundColor="White" Padding="5" CornerRadius="10">
<StackLayout Orientation="Horizontal">
<Label x:Name="label" FontSize="16" TextColor="Black" FontAttributes="Bold" Padding="5" HorizontalTextAlignment="Start" HorizontalOptions="StartAndExpand"/>
<Image Source="arrow.png" WidthRequest="25" HeightRequest="25" Margin="5"/>
</StackLayout>
</Frame>
</expandable:ExpandableView.PrimaryView>
<expandable:ExpandableView.SecondaryViewTemplate>
<DataTemplate>
<Frame BackgroundColor="White" Padding="5" CornerRadius="10">
<Label Text="{Binding Tip1Uitleg}" FontSize="15" TextColor="Black" Padding="5"/>
</Frame>
</DataTemplate>
</expandable:ExpandableView.SecondaryViewTemplate>
</expandable:ExpandableView>
</ContentView.Content>
</ContentView>
namespace Hello
{
public partial class ExpandableView : ContentView
{
public static BindableProperty LabelProperty =
BindableProperty.Create(nameof(Label),
typeof(string),
typeof(ExpandableView),
propertyChanged: (b, o, n) => (b as ExpandableView).OnLabelChanged());
private void OnLabelChanged()
{
label.Text = Label; //label is the x:Name of your Label control in ExpandableView.xaml
}
public string Label
{
get => (string)GetValue(LabelProperty);
set => SetValue(LabelProperty, value);
}
}
}
至此代码:这有效:
<local:ExpandableView Label="Hello"/>
但是我想要这个。这不起作用:
<?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:expandable="clr-namespace:Expandable;assembly=ExpandableView"
xmlns:local="clr-namespace:Hello"
x:Class="Hello.Health.HealthDetail"
Title="{Binding Name}">
<ContentPage.Content>
<ScrollView>
<StackLayout>
<Image Source="{Binding Image}"/>
<Label Text="{Binding Tip1Uitleg}" FontSize="15" TextColor="Black" Padding="10, 5, 10, 5"/>
<local:ExpandableView Label="{Binding Tip1}"/> //This is what it is all about
</StackLayout>
</ScrollView>
</ContentPage.Content>
</ContentPage>
代码隐藏:
namespace Hello.Health
{
public partial class HealthDetail : ContentPage
{
public HealthDetail(HealthStrings healthStrings)
{
if (healthStrings == null)
throw new ArgumentNullException();
BindingContext = healthStrings;
InitializeComponent();
}
}
}
我如何进行这项工作?我必须使以上内容更加动态,但我不知道如何。
BTW这也有效:
<Label Text="{Binding Tip1}" />
抱歉,您的解释不清楚,希望有人能帮助我。谢谢您的时间:)
由于您使用的是BindableProperty,因此不应绑定到'this'。相反,当BindableProperty的值更改时,您应该更新Label.Text属性。
public static BindableProperty LabelProperty =
BindableProperty.Create(nameof(Label),
typeof(string),
typeof(ExpandableView),
propertyChanged:(b, o, n) => (b as ExpandableView).OnLabelChanged());
private void OnLabelChanged()
{
label.Text = Label; //label is the x:Name of your Label control in ExpandableView.xaml
}
public string Label
{
get => (string)GetValue(LabelProperty);
set => SetValue(LabelProperty, value);
}
<?xml version="1.0" encoding="UTF-8"?>
<ContentView xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="YourProject.ExpandableView">
<Grid>
<Label x:Name="label"/>
</Grid>
</ContentView>