whitespaceCharacterSet在苹果官方文档中的description
Returns a character set containing only the in-line whitespace characters space (de style="line-height: normal;" >U+0020de>) and tab (de style="line-height: normal;" >U+0009de>).
This set doesn’t contain the newline or carriage return characters.
A character set containing only the in-line whitespace characters space (de style="line-height: normal;" >U+0020de>) and tab (de style="line-height: normal;" >U+0009de>).

whitespaceCharacterSet在苹果官方文档中的description
Returns a character set containing only the in-line whitespace characters space (de style="line-height: normal;" >U+0020de>) and tab (de style="line-height: normal;" >U+0009de>).
This set doesn’t contain the newline or carriage return characters.
A character set containing only the in-line whitespace characters space (de style="line-height: normal;" >U+0020de>) and tab (de style="line-height: normal;" >U+0009de>).