What are some examples of converters in Xamarin.Forms?

What are some examples of converters in Xamarin.Forms?

In Xamarin.Forms, converters are used to convert data from one type to another. For example, a BooleanToVisibilityConverter can convert a boolean value to a visibility state.

Can you give me a code example of a BooleanToVisibilityConverter?

Sure! Here's a simple implementation:

public class BooleanToVisibilityConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return (bool)value ? Visibility.Visible : Visibility.Collapsed;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return (Visibility)value == Visibility.Visible;
    }
}

What other types of converters are commonly used?

Other common converters include StringToColorConverter, which converts strings to Color objects, and DateTimeToStringConverter, which formats DateTime objects as strings.

How do I use a converter in XAML?

You can use a converter in XAML by declaring it in your resources and then referencing it in your bindings. For example:

<ContentPage.Resources>
    <ResourceDictionary>
        <local:BooleanToVisibilityConverter x:Key="BoolToVis" />
    </ResourceDictionary>
</ContentPage.Resources>

<Label IsVisible="{Binding IsVisible, Converter={StaticResource BoolToVis}}" />