Detect touches on a UIView inside UIScrollView preferably with Interaction disabled

Question

I have a UIScrollView with some UIViews in it. What I am trying to do, is catch the touches events when the UIViews are touched/untouched.

The problem I am having, is the UIScrollView seems to swallow all the touch events, especially if you hold for too long on a UIView.

I preferably want the UIScrollView to have userInteraction disabled as it scrolls automatically.

Is this possible?

I have tried subclassing the UIViews but the touches events are never called in it.

tiguero · Accepted Answer · 2012-10-22 22:53:01Z

4

You can attach a tapGesture to your scrollview with something along those lines:

   UITapGestureRecognizer* tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGestureUpdated:)];
   tapGesture.delegate = self;
   tapGesture.numberOfTapsRequired = 1;
   tapGesture.numberOfTouchesRequired = 1;
   [self addGestureRecognizer:_tapGesture];

then in your - (void)tapGestureUpdated:(UITapGestureRecognizer *)tapGesture method this is your responsability to determine the location of the touch and find out if there was a picking on one of your subviews. You could call then a method on a delegate that notify that a specific view has been touched.

edited Oct 22, 2012 at 22:53

answered Oct 22, 2012 at 22:43

tiguero

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4 Comments

Darren Over a year ago

Would this method only be called once? I want the length if time touch is on the UIView, so need the touchStart and touchEnd events.

tiguero Over a year ago

the tapGesture argument has a state such as UIGestureRecognizerStateBegan or UIGestureRecognizerStateEnd i would use this to detect the two touch events you are interested

tiguero Over a year ago

make sure u read the official doc on the tapgesture though: developer.apple.com/library/ios/#documentation/uikit/reference/…

Darren Over a year ago

Thanks, I shall try this method in the morning.

jpcguy89 · Accepted Answer · 2012-10-23 00:59:09Z

1

Perhaps reordering your views so that a view that has a touch recognizer object associated with it is what the app recognizes. Move it in the document outline to the top (scroll view)

edited Oct 23, 2012 at 0:59

answered Oct 22, 2012 at 22:40

jpcguy89

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2 Comments

Darren Over a year ago

I did think of this, but I think it will be very hard to move the UIView the same speed as the scroll view

jpcguy89 Over a year ago

@Darren Hmmm. What about a UIButton set to custom and with an alpha bg set to 0.0? Also, if you add a UIView, it doesn't necessarily have to move with the UIScrollView...

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