/// <summary>
/// Anchors the view to its parent, the parent is considered a container meaning the view will be anchored on the inside edges of its parent.
/// For instance, a constant value of 5 from the right edge will anchor the child to remain 5 spaces to the left of the parent's right edge to remain inside the parent.
/// </summary>
/// <param name="view">The view to anchor.</param>
/// <param name="edges">The edges to anchor.</param>
/// <param name="constant">A constant identifying the edge margins when anchoring to the parent.</param>
/// <returns>The NSLayoutConstraints for the anchor.</returns>
public static NSLayoutConstraint[] Anchor(this UIView view, AnchorEdges edges = AnchorEdges.All, float constant = 0)
{
UIViewExtensions.EnsureHasParent(view);
List <NSLayoutConstraint> constraints = new List <NSLayoutConstraint>();
if ((edges & AnchorEdges.Top) == AnchorEdges.Top)
{
constraints.Add(UIViewExtensions.Activate(view.TopAnchor.ConstraintEqualTo(view.Superview.TopAnchor, constant)));
}
if ((edges & AnchorEdges.Bottom) == AnchorEdges.Bottom)
{
constraints.Add(UIViewExtensions.Activate(view.BottomAnchor.ConstraintEqualTo(view.Superview.BottomAnchor, -constant)));
}
if ((edges & AnchorEdges.Left) == AnchorEdges.Left)
{
constraints.Add(UIViewExtensions.Activate(view.LeftAnchor.ConstraintEqualTo(view.Superview.LeftAnchor, constant)));
}
if ((edges & AnchorEdges.Right) == AnchorEdges.Right)
{
constraints.Add(UIViewExtensions.Activate(view.RightAnchor.ConstraintEqualTo(view.Superview.RightAnchor, -constant)));
}
return(constraints.ToArray());
}
/// <summary>
/// Centers the view horizontally to the center of another view.
/// </summary>
/// <param name="view">A view to center.</param>
/// <param name="secondView">The second view to center to.</param>
/// <param name="constant">An optional offset value when centering.</param>
/// <returns>The NSLayoutConstraint for the anchor.</returns>
public static NSLayoutConstraint AnchorCenterX(this UIView view, UIView secondView, float constant = 0)
{
return(UIViewExtensions.Activate(view.CenterXAnchor.ConstraintEqualTo(secondView.CenterXAnchor, constant)));
}
/// <summary>
/// Centers the view horizontally to the parent.
/// </summary>
/// <param name="view">A view to center.</param>
/// <param name="constant">An optional offset value when centering.</param>
/// <returns>The NSLayoutConstraint for the anchor.</returns>
public static NSLayoutConstraint AnchorCenterX(this UIView view, float constant = 0)
{
UIViewExtensions.EnsureHasParent(view);
return(view.AnchorCenterX(view.Superview, constant));
}
/// <summary>
/// Centers the view both vertically and horizontally to its parent.
/// </summary>
/// <param name="view">A view to center.</param>
/// <returns>The NSLayoutConstraints for the anchor.</returns>
public static NSLayoutConstraint[] AnchorCenter(this UIView view)
{
UIViewExtensions.EnsureHasParent(view);
return(view.AnchorCenter(view.Superview));
}
/// <summary>
/// Aligns the view to the right of another view.
/// </summary>
/// <param name="view">A view.</param>
/// <param name="leftView">A view to align on the left.</param>
/// <param name="constant">An offset between the two view.</param>
/// <returns>A new NSLayoutConstraint.</returns>
public static NSLayoutConstraint AnchorRightOf(this UIView view, UIView leftView, float constant = 0)
{
Throw.IfArgumentNull(leftView, nameof(leftView));
return(UIViewExtensions.Activate(view.LeftAnchor.ConstraintEqualTo(leftView.RightAnchor, constant)));
}
/// <summary>
/// Anchors the width of the view.
/// </summary>
/// <param name="view">A view to anchor.</param>
/// <param name="constant">The width.</param>
/// <returns>The NSLayoutConstraint for the anchor.</returns>
public static NSLayoutConstraint AnchorWidth(this UIView view, float constant = 0)
{
return(UIViewExtensions.Activate(view.WidthAnchor.ConstraintEqualTo(constant)));
}
/// <summary>
/// Anchors the view below another.
/// </summary>
/// <param name="view">A view to anchor.</param>
/// <param name="topView">A view to place above the current view.</param>
/// <param name="constant">An offset between the two views.</param>
/// <returns>The NSLayoutConstraint for the anchor.</returns>
public static NSLayoutConstraint AnchorBelow(this UIView view, UIView topView, float constant = 0)
{
Throw.IfArgumentNull(topView, nameof(topView));
return(UIViewExtensions.Activate(view.TopAnchor.ConstraintEqualTo(topView.BottomAnchor, constant)));
}
/// <summary>
/// Anchors the view below a layout guide.
/// </summary>
/// <param name="view">A view to anchor.</param>
/// <param name="layoutGuide">A layout guide to anchor to.</param>
/// <param name="constant">An offset between the two objects.</param>
/// <returns>The NSLayoutConstraint for the anchor.</returns>
public static NSLayoutConstraint AnchorBelow(this UIView view, IUILayoutSupport layoutGuide, float constant = 0)
{
Throw.IfArgumentNull(layoutGuide, nameof(layoutGuide));
return(UIViewExtensions.Activate(view.TopAnchor.ConstraintEqualTo(layoutGuide.GetBottomAnchor(), constant)));
}
/// <summary>
/// Centers the view vertically to the center of another view.
/// </summary>
/// <param name="view">A view to center.</param>
/// <param name="secondView">The second view to center to.</param>
/// <param name="constant">An optional offset value when centering.</param>
/// <returns>The NSLayoutConstraint for the anchor.</returns>
public static NSLayoutConstraint AnchorCenterY(this UIView view, UIView secondView, float constant = 0)
{
UIViewExtensions.EnsureHasParent(view);
return(UIViewExtensions.Activate(view.CenterYAnchor.ConstraintEqualTo(secondView.CenterYAnchor, constant)));
}
