/// <summary>
/// Restores the constraint's constant value, if it is stored as an associated object.
/// </summary>
/// <param name="constraint">
/// The constraint to restore.
/// </param>
/// <returns>
/// Returns true if the constraint was created for the purpose of collapsing the view.
/// </returns>
public static bool Restore(this NSLayoutConstraint constraint)
{
NSNumber oldConstant = (NSNumber)constraint.GetAssociatedObject(ConstantKey);
NSNumber didCreate = (NSNumber)constraint.GetAssociatedObject(DidCreateKey);
if (oldConstant != null)
{
constraint.Constant = oldConstant.FloatValue;
constraint.SetAssociatedObject(ConstantKey, null);
}
if (didCreate == null)
{
return(false);
}
constraint.SetAssociatedObject(DidCreateKey, null);
return(didCreate.BoolValue);
}