keyEnumerator()
Provides an enumerator to access the keys in the dictionary.
Declaration
func keyEnumerator() -> NSEnumeratorReturn Value
An enumerator object that lets you access each key in the dictionary.
Discussion
Here’s how you might use this method.
If you use this method with instances of mutable subclasses of NSDictionary, your code should not modify the entries during enumeration. If you intend to modify the entries, use the allKeys property to create a snapshot of the dictionary’s keys. Then use this snapshot to traverse the entries, modifying them along the way.
If you want to enumerate the dictionary’s values rather than its keys, use the objectEnumerator() method.
Special Considerations
It is more efficient to use the fast enumeration protocol (see NSFastEnumeration) than this method. Fast enumeration is available in macOS 10.5 and later and iOS 2.0 and later.