UITextInputStringTokenizer
A base implementation of the text-input tokenizer protocol.
Declaration
@MainActor class UITextInputStringTokenizerOverview
If you want to take advantage of this base implementation of the UITextInputTokenizer protocol, you should subclass this class and handle application-specific directions and granularities affected by layout. When you instantiate a class you must supply the document class that’s adopting the UITextInput protocol for your application.
Subclassing notes
When you subclass UITextInputStringTokenizer, override all UITextInputTokenizer methods, calling the superclass implementation (super) when method parameters aren’t affected by layout. For example, the subclass needs a custom implementation of all methods for line granularity. For the left direction, it needs to decide whether left corresponds at a given position to forward or backward, and then call super passing in the storage direction (UITextStorageDirection).