Returns the range in the receiver of the composed character sequence located at a given index.
- iOS 2.0+
- macOS 10.0+
- tvOS 9.0+
- watchOS 2.0+
The index of a character in the receiver. The value must not exceed the bounds of the receiver.
The range in the receiver of the composed character sequence located at
The composed character sequence includes the first decomposed base letter found at or before
an, and its length includes the decomposed base letter and all combining characters that follow.