When an entry field gets focused, the software keyboard appears, potentially covering the entry field. To provide a better user experience, you need to adjust the screen layout so that the entry field remains visible.
First, create a parent class for your views, deriving from ContentPage, and add a HaveKeyboardOffsetProperty.
public class ViewBase : ContentPage
{
public static readonly BindableProperty HasKeyboardOffsetProperty =
BindableProperty.Create(nameof(HasKeyboardOffset), typeof(bool), typeof(ViewBase), false);
public bool HasKeyboardOffset
{
get => (bool)GetValue(HasKeyboardOffsetProperty);
set => SetValue(HasKeyboardOffsetProperty, value);
}
}
iOS Solution:
Next, create the PageElementMapper class to handle the keyboard appearance and adjust the screen layout.
public class PageElementMapper
{
private static double _contentOriginalHeight;
private static Thickness _contentOriginalMargin;
public static void Map(IElementHandler handler, IElement view)
{
if (view is ViewBase viewData)
{
UIKeyboard.Notifications.ObserveWillShow((sender, args) =>
{
if (viewData.HasKeyboardOffset)
{
_contentOriginalHeight = viewData.Content.Height;
_contentOriginalMargin = viewData.Content.Margin;
viewData.Content.HeightRequest = _contentOriginalHeight - args.FrameEnd.Height;
viewData.Content.Margin = new Thickness(0, args.FrameEnd.Height, 0, 0);
}
});
UIKeyboard.Notifications.ObserveWillHide((sender, args) =>
{
if (viewData.HasKeyboardOffset)
{
viewData.Content.HeightRequest = _contentOriginalHeight;
viewData.Content.Margin = _contentOriginalMargin;
}
});
}
}
}
Finally, register the mapper in the MauiProgram.cs file.
public static class MauiProgram
{
public static MauiApp CreateMauiApp()
{
var builder = MauiApp.CreateBuilder();
builder
.UseMauiApp<App>()
.ConfigureMauiHandlers(handlers =>
{
Microsoft.Maui.Handlers.PageHandler.ElementMapper.AppendToMapping("KeyboardOffset", (handler, view) =>
{
if (view is ViewBase)
{
#if IOS
PageElementMapper.Map(handler, view);
#endif
}
});
});
return builder.Build();
}
}
Android solution:
On Android, you can use a PropertyChanged method of the HasKeyboardOffset:
private static void OnHasKeyboardOffsetPropertyChanged(BindableObject bindable, object oldValue, object newValue)
{
#if ANDROID
if (bindable is ViewBase view)
{
if (newValue is bool hasOffset)
if (hasOffset == true)
Microsoft.Maui.Controls.Application.Current.Dispatcher.Dispatch(() =>
{
Platform.CurrentActivity?.Window?.SetSoftInputMode(Android.Views.SoftInput.AdjustResize);
});
else
Microsoft.Maui.Controls.Application.Current.Dispatcher.Dispatch(() =>
{
Platform.CurrentActivity?.Window?.SetSoftInputMode(Android.Views.SoftInput.StateUnspecified);
});
}
#endif
}
Remarks
The provided solution offers a way to manage this in .NET MAUI on iOS. However, always be open to improvements and share your solutions with the community for better practices. This might not be the best solution to do it.