Hello,
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Since we want to accept multi-line input, we could use Xamarin.Forms Editor to achieve this. The Editor control is used to accept multi-line input.
In addition, we also want the middle Editor to fill the rest space of the screen, we could set the VerticalOptions to FillAndExpand for the Editor.
You can refer to the following code:
<ContentPage.Content>
<StackLayout>
<Entry Placeholder="Email" HeightRequest="60"/>
<Entry Placeholder="Subject" HeightRequest="60"/>
<Editor VerticalOptions="FillAndExpand" BackgroundColor="Yellow" />
<Button Text="Send" VerticalOptions="End"></Button>
</StackLayout>
</ContentPage.Content>
The result is:
Best Regards,
Jessie Zhang
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