ios - ScrollView - Gesture Recognizer - Swipe vertically

Question

I have a UIScrollView that works when swiping left or right, however I've reduced the size of the scrollView so, now display area doesn't fully occupy the superview's frame, and swiping works only within the frame of the scroll view.

I would like to be able to scroll vertically even when swiping up and down outside the horizontal bounds of the narrowed scroll view.

It was recommended that I use a gesture recognizer, but that's beyond my current familiarity with iOS and could use more specific advice or a bit more guidance to get started with that.

Answer 1

There is a simpler approach then use a Gesture Recognizer =]

You can setup the superview of the scroll view (which is BIGGER...) to pass the touches to the scroll view. It's working M-A-G-I-C-A-L-Y =]

First, select the view that will pass all it's touches to the scroll view. if your parent view is already ok with that you may use it. otherwise you should consider add a new view in the size that you want that will catch touches.

Now create a new class (I'll use swift for the example)

class TestView: UIView {

    @IBOutlet weak var Scroller: UIScrollView!

    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {

        let view = super.hitTest(point, with: event)

        if (view == self) {
            return Scroller
        }

        return view

    }

}

Nice! now as you can see we added an outlet of the scroller. so use interface builder, select the new view and set it's class to "TestView" in the identity inspector (Or to the name that you'll use for your custom class).

After you set the class and your view is still selected go to connections inspector and connect "Scroller" to your scroll view on the storyboard. All connected properly =]

That's it!! no gesture recognizer needed!! The new view will pass all it's touches to the scroll view and it'll behave just like you pan in it =]

In my answer I used that answer

EDIT: I improved the code now, it wasn't working as expected before, now it catches only when in needs and not every touch in the app as before