UIImageView in UIScrollView Compositing Flashing

Originator:oliver.drobnik
Number:rdar://19323748 Date Originated:22 Dec 2014
Status:Open Resolved:
Product:iOS Product Version:iOS 8.1.2 (12B440)
Classification:Other Bug Reproducible:Always
 
Summary:
An image view as content of a scroll view shows flashing white lines at the right and bottom corners while being zoomed.

Steps to Reproduce:
- Have a single-view app that:
- has a scroll view
- with an image view
- that shows an image and 
- allows zooming

run on iPhone 6 or iPhone 6 Simulator

Expected Results:
- while zooming there should be no visual artefacts

Actual Results:
- while zooming white lines appear on the right and bottom edges of the image view
- A screenshot of the problem is attached. You can see the white lines on it.

Version:
iOS 8.1.2 (12B440)

Notes:
I looked if these white lines are from a background color that is "shining through", but that does not appear to be the case. A workaround I found is that you can set the image view's layer's border width to 2.0 and the border color to black. This will mask the white lines.

Comments


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