public void Show()
{
Animate(0.4, () => {
heightConstraint.Constant = Superview.Frame.Size.Height;
label.Hidden = false;
button.Hidden = false;
Superview.LayoutIfNeeded();
});
}
private void Show()
{
Superview?.LayoutIfNeeded();
verticalConstraint.Constant = 0;
UIView.Animate(0.4, 0.2, UIViewAnimationOptions.TransitionNone, () => { textLabel.Alpha = 1.0f; }, (() =>
{
}));
UIView.Animate(0.4, 0, UIViewAnimationOptions.CurveEaseOut, () => Superview?.LayoutIfNeeded(), Hide);
}
private void AnimateMenu(int newHeight, UICompletionHandler completionBlock)
{
if (completionBlock == null)
{
completionBlock = (finished) => { };
}
var constraint = GetChangedConstraint();
constraint.Constant = newHeight;
// if using spring animation extend duration because spring animation is included
// in duration
AnimateNotify(
duration: AnimationDuration,
delay: 0,
springWithDampingRatio: UseSpringAnimation ? SpringWithDampingRatio : 1, //0.5
initialSpringVelocity: UseSpringAnimation ? InitialSpringVelocity : 1, //0.8
options: UIViewAnimationOptions.CurveEaseInOut,
animations: () => {
// must call LayoutIfNeeded on Superview or change will not animate
if (Superview != null)
{
Superview.LayoutIfNeeded();
}
},
completion: completionBlock);
ViewExpanded = newHeight == ExpandedSize;
if (ViewExpanded && MenuOpenHandler != null)
{
MenuOpenHandler();
}
else if (ViewExpanded == false && MenuClosedHandler != null)
{
MenuClosedHandler();
}
}
private void Hide()
{
verticalConstraint.Constant = currentHeight;
UIView.Animate(0.4, _durations[lunchDuration], UIViewAnimationOptions.TransitionNone, () => Superview?.LayoutIfNeeded(), RemoveFromSuperview);
}
private void EstablishNotificationHandlers()
{
NSNotificationCenter.DefaultCenter.AddObserver(
UIKeyboard.WillShowNotification,
notification => {
if (this.Superview == null)
{
return;
}
var userInfo = notification.UserInfo;
float duration = default(float);
if (!float.TryParse(userInfo[UIKeyboard.AnimationDurationUserInfoKey].ToString(), out duration))
{
return;
}
if (Window == null)
{
return;
}
RectangleF keyboardFrameEnd = this.Superview.ConvertRectFromView(
((NSValue)userInfo[UIKeyboard.FrameEndUserInfoKey]).RectangleFValue, this.Window);
var windowFrame = this.Superview.ConvertRectFromView(Window.Frame, Window);
var heightOffset = (windowFrame.Size.Height - keyboardFrameEnd.Y) - this.Superview.Frame.Y;
heightConstraint.Constant = heightOffset;
UIView.Animate(duration, () => {
this.Superview.LayoutIfNeeded();
});
if (this.Superview is UIScrollView)
{
var keyboardFrameBegin = this.Superview.ConvertRectFromView(
((NSValue)userInfo[UIKeyboard.FrameBeginUserInfoKey]).RectangleFValue, this.Window);
keyboardFrameBegin = this.Superview.ConvertRectFromView(keyboardFrameBegin, null);
var contentInsets = new UIEdgeInsets(0.0f, 0.0f, keyboardFrameBegin.Size.Height, 0.0f);
var scrollViewParent = this.Superview as UIScrollView;
scrollViewParent.ScrollIndicatorInsets =
scrollViewParent.ContentInset =
contentInsets;
var aRect = new RectangleF(scrollViewParent.Frame.Location, new SizeF(scrollViewParent.Frame.Width, scrollViewParent.Frame.Height - keyboardFrameBegin.Size.Height));
UIView activeView = null;
foreach (var subView in scrollViewParent.Subviews)
{
if (subView.IsFirstResponder)
{
activeView = subView;
break;
}
}
if (activeView != null && !aRect.Contains(activeView.Frame.Location))
{
scrollViewParent.SetContentOffset(
new PointF(scrollViewParent.ContentOffset.X, activeView.Frame.Location.Y), true);
}
}
});
NSNotificationCenter.DefaultCenter.AddObserver(
UIKeyboard.WillHideNotification,
notification => {
if (this.Superview == null)
{
return;
}
var userInfo = notification.UserInfo;
float duration = default(float);
if (!float.TryParse(userInfo[UIKeyboard.AnimationDurationUserInfoKey].ToString(), out duration))
{
return;
}
heightConstraint.Constant = 0.0f;
UIView.Animate(duration, () => {
Superview.LayoutIfNeeded();
});
});
}