The active state of the constraint.
- iOS 8.0+
- macOS 10.10+
- tvOS 9.0+
You can activate or deactivate a constraint by changing this property. Note that only active constraints affect the calculated layout. If you try to activate a constraint whose items have no common ancestor, an exception is thrown. For newly created constraints, the
is property is
false by default.
Activating or deactivating the constraint calls
remove on the view that is the closest common ancestor of the items managed by this constraint. Use this property instead of calling