The NSRange for a full string is NSRange(location: 0, length: (text as NSString).length). You cannot use text.count for this. NSRanges on strings are based on UTF-16 code points, not Swift Characters. A character like 👩👩👧👧 has a .count of 1, but a .length of 11. ObjC-based NSRange APIs (even ones ported to Swift) need the latter. Swift interfaces (which use Range rather than NSRange) need the former. Whenever possible, avoid NSRange.
