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:
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.
回答2:
For Swift 3:
let fullCharset = aCharset.union(anotherCharset)
来源：https://stackoverflow.com/questions/18809149/nscharacterset-append-another-character-set