У меня была похожая проблема.Лучший способ решить эту проблему - заключить часть входа в систему в виде прокрутки (аналогично тому, что вы уже делаете) и использовать пользовательские средства визуализации:
Android:
[assembly: ExportRenderer(typeof(ModernLogin), typeof(ModernLoginPageRenderer))]
namespace MyApp.Droid.Renderer
{
public class ModernLoginPageRenderer : PageRenderer
{
public ModernLoginPageRenderer(Context context) : base(context)
{
}
protected override void OnElementChanged(ElementChangedEventArgs<Page> e)
{
base.OnElementChanged(e);
// Deactivate SoftInput View Adjustment for this window
if (e.NewElement != null)
{
(this.Context as FormsApplicationActivity).Window.SetSoftInputMode(SoftInput.AdjustResize);
}
}
protected override void OnWindowVisibilityChanged([GeneratedEnum] ViewStates visibility)
{
// Enable SoftInput View Adjustment after moving away from this window
if (visibility == ViewStates.Gone)
{
(this.Context as FormsApplicationActivity).Window.SetSoftInputMode(SoftInput.AdjustPan);
}
base.OnWindowVisibilityChanged(visibility);
}
protected override void OnLayout(bool changed, int left, int top, int right, int bottom)
{
base.OnLayout(changed, left, top, right, bottom);
}
}
}
iOS:
[assembly: ExportRenderer(typeof(ModernLogin), typeof(ModernLoginPageRenderer))]
namespace MyApp.iOS.Renderer
{
public class ModernLoginPageRenderer : PageRenderer
{
NSObject observerHideKeyboard;
NSObject observerShowKeyboard;
public override void ViewDidLoad()
{
base.ViewDidLoad();
var cp = Element as ModernLogin;
if (cp != null)
{
foreach (var g in View.GestureRecognizers)
{
g.CancelsTouchesInView = true;
}
}
}
public override void ViewWillAppear(bool animated)
{
base.ViewWillAppear(animated);
observerHideKeyboard = NSNotificationCenter.DefaultCenter.AddObserver(UIKeyboard.WillHideNotification, OnKeyboardNotification);
observerShowKeyboard = NSNotificationCenter.DefaultCenter.AddObserver(UIKeyboard.WillShowNotification, OnKeyboardNotification);
}
public override void ViewWillDisappear(bool animated)
{
base.ViewWillDisappear(animated);
NSNotificationCenter.DefaultCenter.RemoveObserver(observerHideKeyboard);
NSNotificationCenter.DefaultCenter.RemoveObserver(observerShowKeyboard);
}
void OnKeyboardNotification(NSNotification notification)
{
if (!IsViewLoaded) return;
var frameBegin = UIKeyboard.FrameBeginFromNotification(notification);
var frameEnd = UIKeyboard.FrameEndFromNotification(notification);
var page = Element as ModernLogin;
if (page != null)
{
var padding = page.Padding;
page.Padding = new Thickness(padding.Left, padding.Top, padding.Right, padding.Bottom + frameBegin.Top - frameEnd.Top);
}
}
}