Inserts a string at a specified location in the character buffer of a CFMutableString object.
- iOS 2.0+
- macOS 10.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
- Core Foundation
The string to be modified. If this value is not a CFMutableString object, an assertion is raised.
The index of the character in
strafter which the new characters are to be inserted. If the index is out of bounds, an assertion is raised.
The string to insert into
To accommodate the new characters, this function moves any existing characters to the right of the inserted characters the appropriate number of positions.