swift_pos.swift

let text = "Hello world, I am a data scientist. I work with machine learning!"

// Initialize the tagger
let tagger = NLTagger(tagSchemes: [.lexicalClass])
// Ignore whitespace and punctuation marks
let options : NLTagger.Options = [.omitWhitespace, .omitPunctuation]
// Process the text for POS
tagger.string = text

// loop through all the tokens and print their POS tags
tagger.enumerateTags(in: text.startIndex..<text.endIndex, unit: .word, scheme: .lexicalClass, options: options) { tag, tokenRange in
    if let tag = tag{
        print("\(text[tokenRange]): \(tag.rawValue)")
    }
    return true
}