Accessing Indicies Within an Attributed Substring

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Topics 話題

Accessing Terminal Indices

var startIndex: AttributedString.Index
The position of the first character in a nonempty attributed substring.
var endIndex: AttributedString.Index
A substring’s past-the-end position — the position one greater than the last valid subscript argument.

Accessing Indices by Offset

func index(AttributedString.Index, offsetByCharacters: Int) -> AttributedString.Index
Returns the position of a character offset a given distance, measured in characters, from a given string index.
func index(AttributedString.Index, offsetByRuns: Int) -> AttributedString.Index
Returns the position of the run offset a given number of runs from a given string index.
func index(AttributedString.Index, offsetByUnicodeScalars: Int) -> AttributedString.Index
Returns the position of the Unicode scalar offset a given distance, measured in Unicode scalars, from a given string index.

Accessing Indices Before a Known Position

func index(beforeCharacter: AttributedString.Index) -> AttributedString.Index
Returns the character immediately before another charcter indicated by an index.
func index(beforeRun: AttributedString.Index) -> AttributedString.Index
Returns the position of the run immediately before a run indicated by an index.
func index(beforeUnicodeScalar: AttributedString.Index) -> AttributedString.Index
Returns the position of the Unicode scalar immediately before a Unicode scalar indicated by an index.

Accessing Indices After a Known Position

func index(afterCharacter: AttributedString.Index) -> AttributedString.Index
Returns the position of the character immediately after another charcter indicated by an index.
func index(afterRun: AttributedString.Index) -> AttributedString.Index
Returns the position of the run immediately after a run indicated by an index.
func index(afterUnicodeScalar: AttributedString.Index) -> AttributedString.Index
Returns the position of the Unicode scalar immediately after a Unicode scalar indicated by an index.

Supporting Types 支援を行う型

struct AttributedString.Index
A type that represents the position of a character or code unit within an attributed string. ある型、それはある文字またはコード単位の位置をある属性付き文字列り内部で表すものです。