localizedCaseInsensitiveContainsString not available in Swift

问题

I'm trying to use localizedCaseInsensitiveContainsString() method introduced in iOS 8:

let match = text.localizedCaseInsensitiveContainsString(searchText)

Swift compiler says:

'String' does not have a member named 'localizedCaseInsensitiveContainsString'

Documentation says:

Swift automatically bridges between the String type and the NSString class.

So, what's going on here?

I know I can use (title as NSString). I just want to know why.

回答1:

I think you still need to cast it to not confuse the compiler I guess:

let match = (text as NSString).localizedCaseInsensitiveContainsString(searchText)

来源：https://stackoverflow.com/questions/26175359/localizedcaseinsensitivecontainsstring-not-available-in-swift