iOS 15 Simulator - collection view cells rendering broken when scrolling...?

Question

I'm running my App on latest Xcode 13, running my app on iOS 15 in the simulator creates weird rendering bug / issue, when scrolling table rows (that contain collection views) horizontally. This is only visual. Touch points on cells are all ok, and I can scroll with my finger where the rendering doesn't...

This is a table of collection views...

Also if I scroll the table vertically any rendering glitches are resolved...until I scroll left to right again.

Maybe it is an Xcode simulator bug, Does it behave the same in iPhone? — Saurav_Sharma, Sep 29 '21 at 17:49
No, this is only happening on the simulator. It's quite distracting...grrr. Only happening to me? — Jules Burt, Sep 30 '21 at 16:35
Then it's a Xcode bug. Try running on another simulator or add new simulator. — Saurav_Sharma, Oct 01 '21 at 04:26

score 0 · Answer 1 · answered Dec 01 '21 at 16:22

I had almost related UI issues after updating to new Xcode 13. After reviewing my autoLayout code I found out that I was adding subViews as children of a collectionViewCell rather than it's contentView, as a side note this used to work on Xcode 12.x and lower.

So to fix the bug, all I had to do was: -

// instead of doing this: - 
self.addSubView(YourChildView)

// It should be: - 
self.contentView.addSubView(YourChildView)

// Then proceed with other layout stuffs

iOS 15 Simulator - collection view cells rendering broken when scrolling...?

1 Answers1