How to create variable argument methods in Objective-C

Question

Maybe this will be obviously simple for most of you, but could you please give an example how to create similar methods (in Objective-C) and functions in C to create functio

Answer 1

One thing to mention here is that, the first NSString parameter here comes as format, and the other are passed in the variable argument. right? So before entering the for loop, you have one parameter to handle.

- (NSString *) append:(NSString *)list, ...
{
    NSMutableString * res = [NSMutableString string];
    [res appendString:list];

    va_list args;
    va_start(args, list);
    id arg = nil;

    while(( arg = va_arg(args, id))){
        [res appendString:arg];
    }
    va_end(args);
    return res;
}

- (void) test_va_arg
{
    NSString * t = [self append:@"a", @"b", @"c", nil];
    STAssertEqualObjects(@"abc", t, @"");
}