Get the extension of a file contained in an NSString

Question

I have an NSMutable dictionary that contains file IDs and their filename+extension in the simple form of fileone.doc or filetwo.pdf. I need to determine what type of file it

Answer 1

In Swift 3 you could use an extension:

extension String {

public func getExtension() -> String? {

        let ext = (self as NSString).pathExtension

        if ext.isEmpty {
            return nil
        }

        return ext
    }
}