Determines whether the contact property value for the specified key is fetched.
- iOS 9.0+
- macOS 10.11+
- UIKit for Mac 13.0+Beta
- watchOS 2.0+
A contact property key. For a list of valid keys, see Contact Keys.
true if the value is fetched, otherwise
are methods are used when you are not certain of the keys that were fetched. If this method returns
false, refetch the contact using the contact identifier and the keys you want to fetch. Accessing a property that was not fetched will throw