Swift – encode URL

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If I encode a string like this: 

var escapedString = originalString.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)

it doesn’t escape the slashes /.

I’ve searched and found this Objective C code: 

NSString *encodedString = (NSString *)CFURLCreateStringByAddingPercentEscapes(
                        NULL,
                        (CFStringRef)unencodedString,
                        NULL,
                        (CFStringRef)@"!*'();:@&=+$,/?%#[]",
                        kCFStringEncodingUTF8 );

Is there an easier way to encode an URL and if not, how do I write this in Swift?

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