in Xamarin How to change frame of superview when constraints are added to subviews programatically?

Question

TopView : Superview, Subviews in topview : confirmImage,confirmationInfoView, visitLabelContainer, noteTextLabel, dashboardButton.

contentContainer : Superview of TopView

Constrains added to topview :

topView.AtLeftOf(contentContainer),
topView.AtRightOf(contentContainer),
topView.AtTopOf(contentContainer),
topView.Height().EqualTo(444),

Constraints Added to subview of topView :

topView.AddConstraints(

confirmImage.WithSameCenterX(topView),
confirmImage.AtTopOf(topView, 27),
confirmImage.Width().EqualTo(94),
confirmImage.Height().EqualTo(94),

confirmationInfoView.Below(confirmImage, 28),
confirmationInfoView.WithSameCenterX(topView),
confirmationInfoView.Width().EqualTo(284),
confirmationInfoView.Height().EqualTo(116),

visitLabelContainer.Below(confirmationInfoView, 3),
visitLabelContainer.WithSameCenterX(topView),
visitLabelContainer.Width().EqualTo(138),
visitLabelContainer.Height().EqualTo(19),

noteTextLabel.AtBottomOf(topView, 29),
noteTextLabel.WithSameCenterX(topView),
noteTextLabel.Width().EqualTo(343),
noteTextLabel.Height().EqualTo(36),

dashboardButton.AtBottomOf(topView, 87),
dashboardButton.WithSameCenterX(topView),
dashboardButton.Width().EqualTo(347),
dashboardButton.Height().EqualTo(44)

);

If i change frame height of topview it doesn't change anything. If i change bounds height of topview it changes frame 'y' to negative. (half of a height).

Can anyone please suggest me how to change frame in xamarin when constrains are enabled.

Thanks in advance.

Answer 1

Since you have used autolayout to place your control, you should modify the height constraint to change the height of topview:

foreach (var constraint in contentContainer.Constraints)
{
    if (constraint.FirstItem == topView && constraint.FirstAttribute == NSLayoutAttribute.Height)
    {
        constraint.Constant += 174;
    }
}