iphone development: swipe recogniser on a scrollview

Question

In my app I have a swipe gesture recogniser on my background scroller for the up direction but somehow it does not work. Here is my code below

It is in viewDidLoad

UISwipeGestureRecognizer *Swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(SwipeRecognizer:)];
Swipe.direction = UISwipeGestureRecognizerDirectionUp;
[backgroundScroller addGestureRecognizer:Swipe];

and it is the SwipeRecognizer:

- (void) SwipeRecognizer:(UISwipeGestureRecognizer *)sender {
    if (sender.direction | UISwipeGestureRecognizerDirectionUp){
        NSLog(@" *** SWIPE UP ***");
    }
}

However I cant have any log. Am I missing something? Thanks.

EDIT: I found the problem. when I said scrolling is not enabled, I can recognise the gesture. But I need to to scrolling and gesture recognition simultaneously. isn't it possible?

Paresh Navadiya · Answer 1 · 2012-09-03T11:49:48.573

0

Have u registered UIGestureRecognizerDelegate in .h file like this:

@interface yourViewController : UIViewController<UIGestureRecognizerDelegate>

Also

-(void)SwipeRecognizer:(UISwipeGestureRecognizer *)sender{
  if (sender.direction == UISwipeGestureRecognizerDirectionUp){
    NSLog(@" *** SWIPE UP ***");
  }
}

edited Sep 03 '12 at 11:49

answered Sep 03 '12 at 11:24

Paresh Navadiya

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debug and check method is called – Paresh Navadiya Sep 03 '12 at 11:35
I tried it. Yes it the problem. somehow the method is not calling but I have no idea why? :/ – death7eater Sep 03 '12 at 11:47
what contains in your scrollview? – Paresh Navadiya Sep 03 '12 at 11:52
http://stackoverflow.com/questions/3648967/how-to-recognize-swipe-gesture-in-uiscrollview – Paresh Navadiya Sep 03 '12 at 11:53
make userInteraction enabled to YES for ImageView – Paresh Navadiya Sep 03 '12 at 12:13
I found the problem and edited my question but cannot solve it. It is something like mentioned in the link you gave but not the same. – death7eater Sep 03 '12 at 12:46

score 0 · Answer 2 · answered Sep 03 '12 at 11:52

0

Try like this. If you don't get any NSLog(@" *** SwipeRecognizer ***") out put then i think you didnt tuch on SwipeRecognizer.

- (void) SwipeRecognizer:(UISwipeGestureRecognizer *)sender {
 NSLog(@" *** SwipeRecognizer ***");
if (sender.direction == UISwipeGestureRecognizerDirectionUp){
    NSLog(@" *** SWIPE UP ***");
}
}

I think it will be helpful to you.

answered Sep 03 '12 at 11:52

Prasad G

6,702
7
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No still I do not get any log. – death7eater Sep 03 '12 at 11:57

iphone development: swipe recogniser on a scrollview

2 Answers2