how to completely remove gesture recognizers

Question

I'm trying to remove three gesture recognizers attached to a uiscrollview.

I list them using

NSArray * activeScrollViewGRecs = [theScrollView gestureRecognizers];
NSLog (@"activeScrollViewGRecs count: %d",[activeScrollViewGRecs count]);

I get the three listed.

Then I remove them with:

for (UIGestureRecognizer *recognizer in activeScrollViewGRecs)
{
    NSLog (@"recognizer: %@",recognizer.description);
    recognizer.enabled = NO;
    [theScrollView removeGestureRecognizer:recognizer];
}

Then I list them again, and get a zero count. They should be gone/removed, right ? Why would then the view continue to respond (and gesture methods getting called) to the same touches/swipes. Is there some kind of a "flushing" mechanism that needs to happen before they're gone for good ?

this is how they get created:

tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handle1:)];
tapGesture.cancelsTouchesInView = NO; tapGesture.delaysTouchesEnded = NO; 
tapGesture.numberOfTouchesRequired = 2; tapGesture.numberOfTapsRequired = 2;     
[self.view addGestureRecognizer:tapGesture]; [tapGesture release];

swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handle2:)];
swipeGesture.cancelsTouchesInView = NO; swipeGesture.delaysTouchesEnded = NO; swipeGesture.delegate = self;
swipeGesture.direction = UISwipeGestureRecognizerDirectionLeft;
[self.view addGestureRecognizer:swipeGesture]; [swipeGesture release];

thanks

Solution

Why don't you use the below gesture delegate to stop any gesture:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch;

Comments

[EarlGrey]

Hi. I am removing them from the same view that they're attached to. I confirm this by checking the gestureRecognizers array before and after the removal. It's 3 before and 0 after.

[EarlGrey]

this is the method I'm removing them in. Now I think that might be THE problem. Removing them in the middle of a delegate method.

[cocoakomali]

Why do you need to remove it? Cant you just return NO in this function?

[EarlGrey]

I guess I'll have to, since I am not being able remove them properly.

[cocoakomali]

You can try one more thing. Do not release the gesture recognizer object after adding it. Use the same while removing it in the function - [removeGestureRecognizer:]

[Philippe Sabourin]

Scrollviews always have gesture recognizers, but the view you're adding to doesn't seem to be the one you're removing from, according to the code you've posted. Try doing it to self.view instead of theScrollView and see if that fixes your issue.