Appends a formatted string to the character contents 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 which the formatted characters from
formatare appended. If this value is not a CFMutableString object, an assertion is raised.
A dictionary containing formatting options for the string (such as the thousand-separator character, which is dependent on locale). Currently, these options are an unimplemented feature.
A formatted string with
Variable list of the values to be inserted in
A formatted string is one with
printf-style format specifiers embedded in the text such as
%f (double), and
%@ (Core Foundation object). The subsequent arguments, in order, are substituted for the specifiers in the character data appended to
the. You can also reorder the arguments in the string by using modifiers of the form "n$" with the format specifiers (for example,
For more information on supported specifiers, see the relevant section in String Programming Guide for Core Foundation.