UIView.transitionWithView not animating

Question

I'm trying to animate the change of an image in a UIImageView using transitionWithVIew. The image changes, but it doesn't seem to be animating. Not sure why this is happening.

Here's my code:

func changeBackgroundAtIndex(index : Int) {
        switch index {
        case 0:
            animateChangeWithImage(MLStyleKit.imageOfAboutMe)
        case 1:
            animateChangeWithImage(MLStyleKit.imageOfProjects)
        case 2:
            animateChangeWithImage(MLStyleKit.imageOfSkills)
        case 3:
            animateChangeWithImage(MLStyleKit.imageOfEducation)
        case 4:
            animateChangeWithImage(MLStyleKit.imageOfTheFuture)
        default:
            animateChangeWithImage(MLStyleKit.imageOfAboutMe)
        }
    }

    func animateChangeWithImage(image : UIImage) {
        UIView.transitionWithView(backgroundImageView, duration: 0.4, options: UIViewAnimationOptions.TransitionCrossDissolve, animations: { () -> Void in
            self.backgroundImageView.image = image
        }, completion: nil)
    }

Any ideas? Thanks :)

Refer this another solution: http://stackoverflow.com/questions/7616655/uiview-transitionwithview-doesnt-work — Rahul Mayani, Apr 22 '15 at 17:36
@Rahul Using `self.View` instead of `self.backgroundImageView` isnt fixing it for me — mlevi, Apr 22 '15 at 18:11

score 1 · Answer 1 · answered Apr 22 '15 at 17:58

1

Change your function signature to this, where you take both the image you want to change and the UIImageView itself. func animateChangeWithImage(image: UIImage, inImageView: UIImageView)

answered Apr 22 '15 at 17:58

Kelvin Lau

6,373
6
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Tried that - it didn't fix it :/. – mlevi Apr 22 '15 at 18:09

score 1 · Accepted Answer · answered Apr 22 '15 at 19:05

The problem was with index. I was getting the index as the uses was scrolling through a scroll view, which would constantly keep updating the index variable and not give it enough time to actually animate.

Putting changeBackgroundAtIndex inside scrollViewDidEndDecelerating instead of scrollViewDidScroll fixed it.

score 0 · Answer 3 · edited May 23 '17 at 12:06

0

It could be that the actual image itself is not animated when changed given that it is not a UIView.

This would seem to do what you want: How to animate the change of image in an UIImageView?

edited May 23 '17 at 12:06

Community

1
1

answered Apr 22 '15 at 17:50

Rory McKinnel

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UIView.transitionWithView not animating

3 Answers3