Enumeration Case

NSLayoutConstraint.Attribute.notAnAttribute

A placeholder value that is used to indicate that the constraint’s second item and second attribute are not used in any calculations. Use this value when creating a constraint that assigns a constant to an attribute. For example, item1.height >= 40. If a constraint only has one item, set the second item to nil, and set the second attribute to NSLayoutAttributeNotAnAttribute.

Declaration

case notAnAttribute = 0