Question

I have defined a protocol like this:

@protocol RSSItemParserDelegate <NSObject>
- (void)RSSItemParser:(RSSItemParser *)parser
didEndParsingSuccesfully:(BOOL)success;
@end

And I am calling this method when some parsing is finished, on success YES and on failure NO, like this:

[delegate RSSItemParser:self didEndProcessSuccesfully:NO];

But I would like it to run in the main thread asynchronously. How can I do this?

I think performSelectorOnMainThread:withObject:waitUntilDone: would work with a solely argument method, but how about methods with two arguments like mines?
specially when working with AVFoundation and CoreVideo there are a lot of delegates methods that have more than 2 arguments, I wonder how are they called.

Thanks

Ignacio

Answer 1

SEL action = @selector(actionWithFoo:bar:baz:);
NSInvocation * i = [NSInvocation invocationWithMethodSignature:[target methodSignatureForSelector:action]];
[i retainArguments];
[i setTarget:target];
[i setAction:action];
[i setArgument:&foo atIndex:2];
[i setArgument:&bar atIndex:3];
[i setArgument:&baz atIndex:4];
[i performSelectorOnMainThread:@selector(invoke) withObject:nil waitUntilDone:NO];

Much easier and more extensible to just use a dictionary.