Custom gesture not sending action message - objective-c

Question

I have created a UIGestureRecognizer subclass called LongPressGestureRecognizer to simulate a long press gesture. (Yes, I know about the concrete subclass which already exists, I'm just learning objective-c and experimenting a bit.)
I have overridden only the following methods :
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
self.state = UIGestureRecognizerStatePossible;
[self performSelector:#selector(setState:) withObject:[NSNumber numberWithInt:UIGestureRecognizerStateRecognized] afterDelay:2];
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
[NSObject cancelPreviousPerformRequestsWithTarget:self];
self.state = UIGestureRecognizerStateCancelled;
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
[NSObject cancelPreviousPerformRequestsWithTarget:self];
self.state = UIGestureRecognizerStateFailed;
}
and in my view controller with a property recognizer to store the gesture recogniser, i have the following code:
- (LongPressGestureRecognizer *)recognizer
{
if (!_recognizer) {
_recognizer = [[LongPressGestureRecognizer alloc] init];
}
return _recognizer;
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self.recognizer addTarget:self action:#selector(log:)];
[self.view addGestureRecognizer:self.recognizer];
}
- (IBAction)log:(LongPressGestureRecognizer *)recognizer
{
//blah blah blah
}
My problem is that log: is not getting called at all... By logging the UIGestureRecogniserStates in the console, I know that the gesture recogniser is working as expected as far as states are concerned...
What am I doing wrong here?

Answer 1

There may be other issues as well, but I can tell you that your -performSelector:withObject:afterDelay: call isn't going to work the way you're hoping; you'll end up passing a pointer to an NSNumber object instead of an int, so state will be set to some kind of junk value. Create a method that will do self.state = UIGestureRecognizerStateRecognized and call that instead.