NSCharacterSet - append another character set
问题 I would like to create a character set that includes all of its own characters, as well as those from another character set. Append in other words. I thought there'd be an obvious way, but after control-space completion in the IDE, and then poking around the docs, I couldn't fine anything. I can see how to append all the characters from a string. But I need to append the characters from another set. I guess I could to-string the second set, if there's a to-string method. How do I do this? 回答1