performSelectorWithNO (http://stackoverflow.com/q/8695810/30461)

gistfile1.m

#import <Foundation/Foundation.h>

@interface Foo: NSObject
- (void) takeBool:(BOOL)yorn;
- (void) takeDouble:(double)d;
@end

int main(int argc, char **argv) {
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

	[[[[Foo alloc] init] autorelease] performSelector:@selector(takeBool:) withObject:[NSNumber numberWithBool:NO]];
	[[[[Foo alloc] init] autorelease] performSelector:@selector(takeDouble:) withObject:[NSNumber numberWithDouble:17000.43]];

	[pool release];
	return EXIT_SUCCESS;
}

@implementation Foo
- (void) takeBool:(BOOL)yorn {
	NSLog(@"Bool value: %hhd", (BOOL)yorn);
}
- (void) takeDouble:(double)d {
	NSLog(@"Double value: %g", d);
}
@end