NSCharacterSet - append another character set

Question

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?

Answer 1

You are probably seaching for this method in NSMutableCharacterSet :

- (void)formUnionWithCharacterSet:(NSCharacterSet *)otherSet

From Doc:

Modifies the receiver so it contains all characters that exist in either the receiver or otherSet.

Answer 2

For Swift 3:

let fullCharset = aCharset.union(anotherCharset)