Touch events on subclass of UIView as a subview of UIScrollView

Question

I have implemented my own custom subclass of UIView and overridden the drawRect: method.

In my custom view I also want the handle touches, so I also overridden touchesBegan, touchesMoved and touchesEnded.

This works fine but if the number of views on the screen increases then I have to use a UIScrollView as the root view of my UIViewController.

Once my custom UIView becomes the subview of UIScrollView, then it does not receive the touch events. Even though I move my finger within my custom UIView, the scroll view gets scrolled (all my touch events go to the UIScrollView).

How do I solve this problem?

score 7 · Accepted Answer · edited May 23 '17 at 10:30

7

There are several approaches you could try:

Try setting the below properties on the UIScrollView:

scrollView.delaysContentTouches = NO;
scrollView.canCancelContentTouches = NO;

See similar SO questions/answers here, here.
Implement hitTest:withEvent:. See here, here.
Use a UIGestureRecognizer. See here, here.

I would personally recommend using a UIGestureRecognizer, but it depends on your specific situation (any of these options may work fine for you).

edited May 23 '17 at 10:30

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answered Jul 27 '13 at 10:41

Steph Sharp

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I have exactly the same problem. Adding delaysContentTouches makes scroll not works – doxsi May 13 '16 at 09:27
I triedl first approach. This exactly what I wanted, Thanks a lot. – MrDEV Jan 11 '18 at 15:17

score 0 · Answer 2 · edited May 23 '17 at 12:02

0

Have a look at this response from another question: https://stackoverflow.com/a/4629821/193254

You'll have to subclass the scrollview too, and implement that hitTest: method.

edited May 23 '17 at 12:02

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answered Jul 26 '13 at 09:51

Andrei Stanescu

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Touch events on subclass of UIView as a subview of UIScrollView

2 Answers2