tag(for:at:unit:scheme:orthography:tokenRange:)
Returns a tag for a single scheme, for a given linguistic unit, at the specified character position in a string.
Declaration
class func tag(for string: String, at charIndex: Int, unit: NSLinguisticTaggerUnit, scheme: NSLinguisticTagScheme, orthography: NSOrthography?, tokenRange: NSRangePointer?) -> NSLinguisticTag?Parameters
- string:
The position of the initial character.
- charIndex:
The linguistic unit. See Nslinguistictaggerunit for possible values.
- unit:
The tag scheme. See Nslinguistictagscheme for possible values.
- scheme:
A pointer to the token range.
Return Value
Returns the tag for the requested tag scheme and linguistic unit, or nil. If a tag is returned, this function returns by reference the range of the token to tokenRange.
Discussion
This is a convenience method for initializing a linguistic tagger, setting the string property, and calling the tag(for:at:unit:scheme:orthography:tokenRange:) method. If you analyze the same string more than once, you should create a linguistic tagger object instead of calling this method.