How to “pass on” a variable number of arguments to NSString's +stringWithFormat:
-
07-07-2019 - |
Question
I would like to write a function in Objective-C such as the one below, that takes a variable number of arguments, and passes those arguments on to +stringWithFormat:
. I know about vsnprintf
, but that would imply converting the NSString 'format' to C and back (and would also mean converting the formatting placeholders within it as well...).
The code below compiles, but of course does not behave as I want :)
NSString *estr(NSString *format, ...) {
va_list args;
va_start(args, format);
NSString *s = [NSString stringWithFormat:format, args];
va_end(args);
return s;
}
Basically: is there a va_list
-friendly version of the +stringWithFormat:
method, or is it possible to write one?
Solution
NSString *estr(NSString *format, ...) {
va_list args;
va_start(args, format);
NSString *s = [[[NSString alloc] initWithFormat:format arguments:args] autorelease];
va_end(args);
return s;
}
they don't seem to have a convenience constructor "stringWith..." version
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