iOS animation in collection view not kicking in

[grandM]

So I'm panning cells in a collection view. The cells are wiggling. I'm using following code to re-order the cells in my dataSet. Everything works out. The only problem I have is that the panned cell sometimes stops wiggling. I noticed this happens when I pan too fast, just throwing it to another place. I looked on the internet. Some people advise using invalidatelayout(). Unfortunately this isn't helping. Does anyone know what could help? Tx.

func panningMediaInMediaCollectionView(gesture: UIPanGestureRecognizer) {
      
        switch(gesture.state){

        case .Began:

            guard let selectedIndexPath = self.mediaCollectionView.indexPathForItemAtPoint(gesture.locationInView(self.mediaCollectionView)) else {break}

            self.mediaCollectionView.beginInteractiveMovementForItemAtIndexPath(selectedIndexPath)


        case .Changed:

            self.mediaCollectionView.updateInteractiveMovementTargetPosition(gesture.locationInView(self.mediaCollectionView))


        case .Cancelled:

            self.mediaCollectionView.cancelInteractiveMovement()


        case .Ended:

            self.mediaCollectionView.endInteractiveMovement()

            self.mediaCollectionView.collectionViewLayout.invalidateLayout()


        default:

            self.mediaCollectionView.cancelInteractiveMovement()

        }

    }

 

[AxoNeuron]

It would be helpful to see what the functions performing the animations are actually doing, can you post those functions? Are you using Core Animation?

 

[grandM]

It would be helpful to see what the functions performing the animations are actually doing, can you post those functions? Are you using Core Animation?

I'm no expert in animation. I barely know the basics about it. I'm using following code:

func animateZoomCell() {

        UIView.animateKeyframesWithDuration(0.1, delay: 0, options: UIViewKeyframeAnimationOptions.AllowUserInteraction, animations: { () -> Voidin

            self.transform = CGAffineTransformMakeScale(1.1, 1.1)

            }) { (completed) -> Voidin

                self.transform = CGAffineTransformMakeScale(1.0, 1.0)

        }

    }

   

    func wobble(){


        let animationRotateDegres: CGFloat = 0.5

        let animationTranslateX: CGFloat = 1.0

        let animationTranslateY: CGFloat = 1.0

        let count: Int = 1

       

       

        let leftOrRight: CGFloat = (count % 2 == 0 ? 1 : -1)

        let rightOrLeft: CGFloat = (count % 2 == 0 ? -1 : 1)

        let leftWobble: CGAffineTransform = CGAffineTransformMakeRotation(degreesToRadians(animationRotateDegres * leftOrRight))

        let rightWobble: CGAffineTransform = CGAffineTransformMakeRotation(degreesToRadians(animationRotateDegres * rightOrLeft))

        let moveTransform: CGAffineTransform = CGAffineTransformTranslate(leftWobble, -animationTranslateX, -animationTranslateY)

        let conCatTransform: CGAffineTransform = CGAffineTransformConcat(leftWobble, moveTransform)

       

        transform = rightWobble // starting point

       

        UIView.animateWithDuration(0.1, delay: 0.08, options: [.AllowUserInteraction, .Repeat, .Autoreverse], animations: { () -> Voidin

            self.transform = conCatTransform

            }, completion: nil)

    }

   

    func stopWobbling(){

        self.layer.removeAllAnimations()

    }

 

[AxoNeuron]

If you use print statements are the animations getting called when they should? Try it with just a single cell to isolate the problem.

If it is being called at the right time, is it being called on the main thread?

Problems like this are why I use Core Animation for most purposes, you will definitely want to learn how to use it manually.