A Boolean value that indicates whether the managed object is a fault.
- iOS 3.0+
- macOS 10.4+
- UIKit for Mac 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
- Core Data
true if the receiver is a fault, otherwise
false. Knowing whether an object is a fault is useful in many situations when computations are optional. It can also be used to avoid growing the object graph unnecessarily (which may improve performance as it can avoid time-consuming fetches from data stores).
If this property is
false, then the receiver's data must be in memory. However, if this property is
true, it does not mean that the data is not in memory. The data may be in memory, or it may not, depending on many factors influencing caching.
If the receiver is a fault, accessing this property does not cause it to fire.