CODEWITHSUNDEEP
objective-ccocoa-touchuicollectionviewuipangesturerecognizeruicollectionviewcell
Weston
Weston

Reputation: 1491

Sliding UIView in a UICollectionViewCell is blocking the ability to scroll

I am using a UIPanGestureRecognizer on a UIView that is in a UICollectionViewCell. I am using the translationInView method to get the translation along the X axis and slide the UIView left and right. It works fine, but now I cannot scroll up and down in the CollectionView if my finger is on a cell. Is there a way to make the PanGestureRecognizer pass the vertical scrolling to the UICollectionView?

I am trying to replicate the sliding seen in Reeder.app for iOS.

Upvotes: 3

Views: 1555

Answers (1)

batkru
batkru

Reputation: 295

Once the UIPanGestureRecognizer activates in your UIView touches are no longer forwarded through the responder chain, because of that your UICollectionView is not receiving the touches anymore.

You can try setting your UIView as the delegate of your UIPanGestureRecognizer and place the logic of whether the UIPanGestureRecognizer should activate. You have to implement the delegate's method in your UIView:

-(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer;

For example with the code below you would tell it not to activate if the velocity on the y axis of the view is greater than the velocity of the x axis (therefore sending the touches to the UICollectionView under it)

-(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{

    UIPanGestureRecognizer *recognizer = (UIPanGestureRecognizer *)gestureRecognizer;
    CGPoint velocity =[recognizer velocityInView:self];
    if(abs(velocity.y)>=(abs(velocity.x))){
        return NO;
    }else return YES;

}

Hope this is helpful.

Upvotes: 9

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