Question

In my code i add the gestures to an array. That what i mentioned:

- (void)handlePanGesture:(UIPanGestureRecognizer *)panGestureRecognizer{
     [arrayLineGestures addObject:panGestureRecognizer];
     [arrayAllGestures addObject:[arrayLineGestures copy]];

   }

So after a time i wanna use them again and i use this code:

for (int i=0; i<[arrayAllGestures count]; i++) {
    for (int k=0;k<[[arrayAllGestures objectAtIndex:i]count]; k++) {
        UIPanGestureRecognizer *panGestureRecognizer=(UIPanGestureRecognizer *)[[arrayAllGestures objectAtIndex:i]objectAtIndex:k];           
        const CGPoint point = [[CCDirector sharedDirector] convertToGL:[panGestureRecognizer locationInView:panGestureRecognizer.view]];
        if (panGestureRecognizer.state == UIGestureRecognizerStateBegan) {Nslog(@"began")}

But this code doesn’t work. It shows the pangesture state as UIGestureRecognizerStatePossible.But before i add them to the array i checked the states no one is UIGestureRecognizerStatePossible. I couldn’t see the mistake.

Thanks.

Answer 1

The state of any UIGestureRecognizer will only be valid for the time you are in your handler. The panGestureRecognizer that you are passed in is not a snapshot of state, but rather an object reference to the recognizer. When you store it off in an array and try to reference it later, the state isn’t valid because the life-cycle of the recognizer has likely expired.

If you iterate through your array, you’ll probably find that all of the recognizers are the same object. I don’t know if this is guaranteed though, so don’t rely on that.