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GestureRecognizer not working with UIScrollView in Objective-C?

Anonymous User 2273 20-Feb-2016
I have created an app using UIScrollView and I also added a gesture recognizer but calling method in gesture recognizer is not working.
this is the code:
UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc]
                                      initWithTarget:self
                                      action:@selector(doubbleTapHandler:)];
[self.scrollView addGestureRecognizer:doubleTap];
and this is the implementation:

-(void)doubleTapHandler:(UITapGestureRecognizer*)recognizer
{
  //here I am doing some UIRelatedTasks
}
Can any one tell me how can I solve this issue?
iphone iphone  ios  objective c 
Updated on 22-Feb-2016
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1 Answers

Tarun Kumar

Tarun Kumar

22-Feb-2016
According to the code you are provided above, you are created tap gesture recognizer and add it to the scrollview. All the thing is correct but tell me one thing how your scrollview will find that double tap is happening on it.
So add this line of code, this scrollview will count the number of taps if 2 tap will happened on it then it will coll the selector method doubleTapHandler:
doubleTap .numberOfTapsRequired=2;
Here is your complete code:
UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc]
                                      initWithTarget: self
                                      action:@selector(doubbleTapHandler:)];
doubleTap.numberOfTapsRequired = 2;
[self.scrollView addGestureRecognizer: doubleTap];

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