Detecting touches on a scrollview

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Detecting touches on a scrollview

Is it possible to detect the touches in a scrollview which is filled with a grid of buttons as in the image below?

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For example, in this image, i can only drag the scroll view by dragging on the red areas, but i would like to be able to scroll the scrollview no matter where it is touched (like the iPhone's home screen)?

Thanks

Yes, this is absolutely possible. Ironically enough, I had to do this last night. In my case, I was embedding a UIView inside a UIScrollView, but I still wanted to detect taps and presses on my embedded view. To do this, I enabled user interaction on the UIView and then attached a UITapGestureRecognizer and a UILongPressGestureRecognizer to it. It works beautifully. :)

Dave DeLong 2010-10-04 15:15:34

So, since my buttons are UIButtons, and they are subclasses of UIView which have interaction enabled by default, i need to attach a TapRecognizer to each button to detect the taps and the LongPress to the scrollview? Or is the LongPress to the button as well? Thanks

joec 2010-10-04 15:28:26

It's possible that the UIButtons will work as-is. If they don't, there are several ways around this (such as attaching a UIGR to the superview, disabling interaction on the buttons, and then using the hitTest: method to identify which button and alter it appropriately)

Dave DeLong 2010-10-04 15:34:56

I think the buttons work fine now. My issue is going to be scrolling the scrollview. Do i add the long press to the scrollview or the button?

joec 2010-10-04 15:40:38

@joec my longpressGR was so I could detect a long press on one of my buttons (different from a tap). Unless you also need the same functionality, you don't need that GR.

Dave DeLong 2010-10-04 15:43:46

Ah ok, well i dont need that functionality. Were you able to detect the scrollview drags without doing anything?

joec 2010-10-04 15:57:51

@joec yep (6chars)

Dave DeLong 2010-10-04 16:00:31

I see i asked if it was possible. I must be missing something then for mine not to work?

joec 2010-10-04 16:05:50

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Detecting touches on a scrollview

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