Returns whether the line being laid out should be broken by hyphenating at the specified character.
- macOS 10.4+
The index of the character just after the proposed hyphenation would occur.
true if the line should be broken by hyphenating,
The typesetter calls this method, if implemented by a subclass, before breaking a line by hyphenating before the character at
char, enabling the subclass to control line breaking.
A subclass can override this method to customize the text layout process. If the method returns
false, the typesetter continues looking for a break point.