CODEWITHSUNDEEP
iosuiscrollview
Rogare
Rogare

Reputation: 3274

How to conditionally "pass through" a gesture from a UIButton to a UIScrollView?

I have a long, horizontal, narrow UIScrollView containing several buttons side-by-side. When a user drags a button vertically, a specific method is triggered (via a UIPanGestureRecognizer), and the scrollview doesn't scroll (even if his/her drag begins to go left or right). This is all good.

When a user drags horizontally anywhere on the scrollview, including directly on a button, the UIPanGestureRecognizer ignores the effect and the scrollview should scroll. It's the last effect I'm having trouble with: when the user horizontally drags directly on a button, the scrollview doesn't scroll. How can I "pass through" that horizontal gesture to the scrollview?

Thanks for reading!

Upvotes: 2

Views: 2059

Answers (3)

Aurelien Cobb
Aurelien Cobb

Reputation: 435

On UIScrollView you can override 

- (BOOL)touchesShouldCancelInContentView:(UIView *)view

Subclass UIScrollView (or UITableView) and return YES. It will cancel any touch from subviews when scrolling starts.

Upvotes: 1

hatfinch
hatfinch

Reputation: 3095

Add this method to your buttons' UIPanGestureRecognizer's delegate:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return (otherGestureRecognizer == _scrollView.panGestureRecognizer);
}

Upvotes: 1

instaable
instaable

Reputation: 3509

Give a thought to UILongPressGestureRecognizer. This might help you: Combine longpress gesture and drag gesture together

Upvotes: 0

Related Questions