Demo of the UIKit delegate behavior described in this pull request: https://github.com/ReactiveCocoa/ReactiveCocoa/pull/745

UIKit Delegate Behavior Demo

@interface Delegate : NSObject <UIActionSheetDelegate>
@end

@implementation Delegate
- (BOOL)respondsToSelector:(SEL)aSelector {
  NSLog(@"-respondsToSelector: '%@'", NSStringFromSelector(aSelector));
  return YES;
}
@end


/*
 * call this method and you'll see that the delegate is asked if it
 * responds to each of the optional methods in the UIActionSheetDelegate protocol
 */
- (void)tryIt {
	Delegate *d = [[Delegate alloc] init];
	UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:nil
							   delegate:d
						  cancelButtonTitle:@"Cancel"
					     destructiveButtonTitle:@"Destroy"
						  otherButtonTitles:nil];
}