先看下实现的效果:

下面发下XAML文件:
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="MauiApp2.MainPage">
    <ScrollView>
        <VerticalStackLayout
            Padding="30,0"
            Spacing="25">
            <Label x:Name="txt_label" Text="Value :0 "></Label>
            <Slider x:Name="slider_1" Minimum="0" Maximum="1"  ValueChanged="Slider_ValueChanged" />
            <Image
                Source="dotnet_bot.png"
                HeightRequest="185"
                Aspect="AspectFit"
                SemanticProperties.Description="dot net bot in a race car number eight" />
            <Label
                Text="Hello, World!"
                Style="{StaticResource Headline}"
                SemanticProperties.HeadingLevel="Level1" />
            <Label
                Text="Welcome to 
.NET Multi-platform App UI"
                Style="{StaticResource SubHeadline}"
                SemanticProperties.HeadingLevel="Level2"
                SemanticProperties.Description="Welcome to dot net Multi platform App U I" />
            <Button
                x:Name="CounterBtn"
                Text="Click me" 
                SemanticProperties.Hint="Counts the number of times you click"
                Clicked="OnCounterClicked"
                HorizontalOptions="Fill" />
        </VerticalStackLayout>
    </ScrollView>
</ContentPage>.cs文件:
namespace MauiApp2
{
    public partial class MainPage : ContentPage
    {
        int count = 0;
        public MainPage()
        {
            InitializeComponent();
        }
        private void OnCounterClicked(object sender, EventArgs e)
        {
            count++;
            if (count == 1)
                CounterBtn.Text = $"Clicked {count} time";
            else
                CounterBtn.Text = $"Clicked {count} times";
            SemanticScreenReader.Announce(CounterBtn.Text);
        }
        private void Slider_ValueChanged(object sender, ValueChangedEventArgs e)
        {
            this.txt_label.Text = this.slider_1.Value.ToString();
        }
    }
}下一个示例实现调用手机的蓝牙或者一些设备。