Comments on Cocoa with Love: Variable argument lists in Cocoa

Been having difficulty getting this to support ARC...

2011-11-25T11:20:16.684-08:00

Been having difficulty getting this to support ARC. Anyone been successful?

Awesome articles, it was just what I was looking f...

2011-11-03T16:08:11.174-07:00

Awesome articles, it was just what I was looking for. I've used your technique to override the NSString class to allow for nillable formate args to remove that pesky "(null)" value from formatted strings.

@implementation NSString(Extras)
//
+(NSString *)emptyString{

return @"";
}

//
+(NSString *)stringWithNillableFormat:(NSString *)format, ...{

va_list args;
va_start(args, format);

NSString *formattedString = [[[NSString alloc] initWithFormat:format arguments:args] stringByReplacingOccurrencesOfString:@"(null)"
withString:[NSString emptyString]];
va_end(args);

return formattedString;
}
@end

Great post!

Perfect ... I wish more of Apple's doc was to ...

2011-11-03T07:08:58.659-07:00

Perfect ... I wish more of Apple's doc was to the point as this was.

Best blog ever! Thank you for this great job!

2011-09-26T13:05:49.872-07:00

Best blog ever! Thank you for this great job!

here's my code for a UIAlertView subclass, whi...

2011-06-15T13:24:00.558-07:00

here's my code for a UIAlertView subclass, which is the same:

- (id)initWithTitle:title
message:message
delegate:delegate
cancelButtonTitle:cancelButtonTitle
otherButtonTitles:otherButtonTitles, ...
{
self = [super initWithTitle:title
message:message
delegate:delegate
cancelButtonTitle:cancelButtonTitle
otherButtonTitles:nil];
va_list args;
va_start(args, otherButtonTitles);
for (NSString *arg = otherButtonTitles; arg != nil; arg = va_arg(args, NSString*)) {
[self addButtonWithTitle:arg];
}
va_end(args);
// do something...
return self;
}

Thank you for the excellent tutorial!

2011-06-10T10:56:36.373-07:00

Thank you for the excellent tutorial!

You probably can't. Try to create nil button. ...

2011-05-26T10:43:50.000-07:00

You probably can't. Try to create nil button. And then add button manually.

Thanks for the excellent write up. I'm using i...

2010-12-20T19:15:57.000-08:00

Thanks for the excellent write up. I'm using it in a debug logging class I've created and it works quite well.

I haven't been writing objective-c programs for too long, but the one thing about Apple that drives me crazy is how they seem to deprecate methods, without providing a good alternative. As of Snow Leopard, this has happened to the getObjects method, because it could cause buffer overruns. (They don't trust app developers to make sure the buffer is large enough to hold the object pointers?)

Dmitry Chestnykh: "Why is that? It's a pointer, and pointers are 8 bytes on x86_64, be it NSString * or char * or whatever *."

I didn't believe it myself, so I wrote a little test program (XCode 3.2.2 on 10.6.3) and, making sure it was compiling 64 bit, I ran the test which printed the sizes of (char *) (NSString *) and (char) to terminal. The results were, as expected, 8, 8 and 1 byte(s). I'm fairly new to Apple development, so perhaps before OS X had complete 64 bit support this may have been true? (Maybe 64 bit addressing was confined to call and jmp instructions while using 32 bits for data addressing?)

Anyway, thanks for a great article!

Hello all, I am trying to create a variable argum...

2010-11-02T06:20:14.000-07:00

Hello all,

I am trying to create a variable arguments list routine for NSString and then inside that routine pass that args to another routine that has a sentinel. I created my routine with ... otherButtonsTitles:(NSString*)otherTitles, ... NS_REQUIRES_NIL_TERMINATION; in the declaration and then in the implementation ... otherButtonTitles:(NSString*)otherTitles, ... {

va_list args;
va_start(args, otherTitles);

UIActionSheet* actionSheet = [[UIActionSheet alloc] initWithTitle:title
delegate:delegate
cancelButtonTitle:cancelTitle
destructiveTitle:nil
otherButtonTitles:args];
va_end(args);

...
}

this routine complains that it needs a sentinel but I am passing in [@"Yes, @"No", nil] to this routine. And when I run it, it fails with EXEC_BAD_ACCESS.

Any ideas as to why this doesn't work?

Thanks,

Kenneth

Thanks a lot.

2010-05-20T07:46:00.000-07:00

Thanks a lot.