첨부 소스 코드는 나눔고딕코딩 폰트를 사용합니다.
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TestProject.zip
0.15MB

▶ MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage x:Class="TestProject.MainPage"
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml">
    <StackLayout
        HorizontalOptions="Center"
        VerticalOptions="Center">
        <Entry x:Name="entry"
            WidthRequest="300"
            Text=""
            Placeholder="텍스트를 입력해주시기 바랍니다." />
        <Button
            Margin="0,10,0,0"
            WidthRequest="100"
            Text="저장">
            <Button.Triggers>
                <DataTrigger
                    TargetType="Button"
                    Binding="{Binding Source={x:Reference entry}, Path=Text.Length}"
                    Value="0">
                    <Setter Property="IsEnabled" Value="False" />
                </DataTrigger>
            </Button.Triggers>
        </Button>
    </StackLayout>
</ContentPage>
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