iOS how to ignore parent view receive touch event after child view handle it

Question

Please take a look at the picture below:

I have a custom UIControl as RangeSlider which I implemented by follow this tutorial. I place the RangeSlider inside a FilterViewController which can slide in or out.

On class RangeSlider I used 3 methods of UIControl: beginTracking, continueTracking, endTracking to handle touch event when user move the indicator of slider.

On class FilterViewController I used UIPanGestureRecognizer to handle touch event when user slide in or out.

Problem

When I try to move the indicator of slider, the ViewController also move. And the indicator is just move a bit. It seem to be the both of child view and parent view received touch event.

Question

How can I ignore the parent view(ViewController) receive touch event?

Aleksandr Honcharov · Accepted Answer · 2017-02-07 08:25:29Z

0

You can write this in viewDidLoad().

self.view.isUserInteractionEnabled = false

answered Feb 7, 2017 at 8:25

Aleksandr Honcharov

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2 Comments

mr.icetea Over a year ago

What is use of it?

Aleksandr Honcharov Over a year ago

Your parent controller view will not receive any touch events.

Quang Hà · Accepted Answer · 2017-02-07 10:24:30Z

0

You should implement method of your PanGestureRecognizer delegate

gestureRecognizerShouldBegin(_:)

edit: please try

override func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
    guard let view = gestureRecognizer.view, view.isKind(of: UIControl.self) else {
        return true
    }
    return false
}

Hope this helps.

edited Feb 7, 2017 at 10:24

answered Feb 7, 2017 at 7:30

Quang Hà

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1 Comment

mr.icetea Over a year ago

I have to observe every controls and check if whenever touch event happen with my controls. Is there any way easier or less complicated to solve my problem?

iago849 · Accepted Answer · 2017-02-07 10:34:06Z

-1

This should help within FilterViewController (assuming it is touch delegate)

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
    if ([touch.view isDescendantOfView:self.tableView]) {
        return NO;
    }

    return YES;
}

Sorry for example in objective-c, you can easily convert it into swift. It means that the table or scrollview you use won't react on touches of its subviews (assuming RangeSlider is descendant subview of table view cell). Let me know if that doesn't help, I forced these issues in past by several different ways!

answered Feb 7, 2017 at 10:34

iago849

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2 Comments

mr.icetea Over a year ago

I tried to use that way but it is not work. The problem is: I only want my ViewController's View ignore touch event when it occurs on my RangeSlider but not the other subviews of ViewController's View.

iago849 Over a year ago

got you! if ([touch.view isDescendantOfView:self.slider]) { doesn't work as well? Sorry, can't help in greater details without code, maybe you can share some little test project?

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