ok here’s my try, assuming NSLinguisticTagger knows what it’s doing. And yes 
it’s a bit stupid to use a linguistic tagger to do something like that but .. 
whatever 

var str = "Some String WIth Whitespace "

var lt = NSLinguisticTagger( tagSchemes: [NSLinguisticTagSchemeTokenType], 
options: 0 )
lt.string = str

var endsWithWhitespace = ( lt.tagAtIndex( (str as NSString).length-1, scheme: 
NSLinguisticTagSchemeTokenType, tokenRange: nil, sentenceRange: nil ) == 
NSLinguisticTagOtherWhitespace )


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